Reactive & Functional Polymers最新文献_第3页

Preparation of modified epoxy resin with high hydrophobicity, low dielectric constant, toughness, and flame retardant by epoxy-functionalized siloxanes

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2024.106114

Yang Zhang, Yixiao Shi, Chen Jin, Chuan Wu, Hong Dong, Zhirong Qu, Yanjiang Song

{"title":"Preparation of modified epoxy resin with high hydrophobicity, low dielectric constant, toughness, and flame retardant by epoxy-functionalized siloxanes","authors":"Yang Zhang, Yixiao Shi, Chen Jin, Chuan Wu, Hong Dong, Zhirong Qu, Yanjiang Song","doi":"10.1016/j.reactfunctpolym.2024.106114","DOIUrl":"10.1016/j.reactfunctpolym.2024.106114","url":null,"abstract":"<div><div>A series of <em>α</em>, <em>ω</em>-dimethylglycidoxypropyl-terminated PDMS oligomer (PDMS-GE) oligomers with different polymerization degrees were synthesized and used to modify the bisphenol-A diglycidyl ether E51 (DGEBA) / 4,4-diaminodiphenylmethane (DDM) epoxy resin, resulting in epoxy resins with high hydrophobicity, low dielectric constant, good impact toughness, low combustion heat release rate, and low total heat release. The combustion heat release rate and total heat release of the material decreased with the increase in the loadings of PDMS-GE. Relative to pure epoxy resin, the composite E51/D30–10, which using DGEBA as the matrix, PDMS-GE with a degree of polymerization of 30 as the modifier in an amount of 10 phr relative to the mass sum of DGEBA, PDMS-GE and DDM, exhibited the best comprehensive performance with a water contact angle of 102.42°, a dielectric strength of 6.49 kV/mm, a dielectric constant of 2.93 at 14.2 GHz, the peak rate of heat release (PRHR) and total heat release (THR) are of 378.3 kW/m<sup>2</sup> and 134.4 MJ/m<sup>2</sup>, respectively. These comprehensive performances underscore the potential of PDMS-GE oligomers in significantly improving epoxy resin properties. When the loadings of PDMS-GE oligomers are less than 5 wt%, PDMS-GE with a lower degree of polymerization can improve the toughness of epoxy resins. The impact strength of the composite E51/D24–5, which uses DGEBA as the matrix, PDMS-GE with a degree of polymerization of 24 as the modifier in an amount of 5 phr relative to the mass sum of DGEBA, PDMS-GE, and DDM, reaches 98.1 kJ/m<sup>2</sup>, which is about 28.9 % higher than that of pure epoxy resin. The results also indicated that the degree of polymerization of PDMS-GE oligomers has less influence on the dielectric properties and mechanical properties of composite materials.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"207 ","pages":"Article 106114"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An approach to analytical prediction of optimal curing mode of thermosetting systems

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2024.106143

E.S. Zhavoronok , I.N. Senchikhin

{"title":"An approach to analytical prediction of optimal curing mode of thermosetting systems","authors":"E.S. Zhavoronok , I.N. Senchikhin","doi":"10.1016/j.reactfunctpolym.2024.106143","DOIUrl":"10.1016/j.reactfunctpolym.2024.106143","url":null,"abstract":"<div><div>An approach to the analytical prediction of the optimal curing mode of thermosetting systems is proposed. The published literature on epoxy-amine systems has been analyzed, and a correlation between the parameters of the DiBenedetto and Arrhenius equations and the glass transition temperature of uncured epoxy-amine systems was established. On the basis of the data, the approach proposed by Gillham and Enns was employed to calculate a time required for thermosetting system to reach the glassy state, and the mode of two-stage curing through the use of TTT (time-temperature-transformation) diagrams was determined as well. The optimal curing mode was proposed and calculated for the DGEBA-based epoxy resin Epikote 828 and its mixture with aliphatic resin Laproxide 703 with curing agent oligooxypropylenediamine Jeffamine D-230, with the resulting temperatures and times demonstrating satisfactory agreement with those calculated from experimental TTT diagrams. It is suggested that the proposed approach for predicting the optimal curing mode be employed for new epoxy-amine systems, for which the time-consuming experiment, required for the construction of TTT diagrams has not yet been performed.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"207 ","pages":"Article 106143"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The hidden power of a novel collagen octapeptide: Unveiling its antioxidant and cofactors releasing capacity from polyurethane based systems

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2024.106131

Alexandra Lupu , Luiza Madalina Gradinaru , Mihaela Balan-Porcarasu , Laura Darie-Ion , Brindusa-Alina Petre , Vasile-Robert Gradinaru

{"title":"The hidden power of a novel collagen octapeptide: Unveiling its antioxidant and cofactors releasing capacity from polyurethane based systems","authors":"Alexandra Lupu , Luiza Madalina Gradinaru , Mihaela Balan-Porcarasu , Laura Darie-Ion , Brindusa-Alina Petre , Vasile-Robert Gradinaru","doi":"10.1016/j.reactfunctpolym.2024.106131","DOIUrl":"10.1016/j.reactfunctpolym.2024.106131","url":null,"abstract":"<div><div>Aromatic antioxidant peptides are attractive biomolecules that can be used to design supramolecular structures useful in various biomedical applications. Collagen-derived peptides proved to be suitable for a wide range of biological applications. Herein, we introduced a novel amphipathic octapeptide as an essential component in hybrid peptide-polyurethane materials. The octapeptide was synthesized by SPPS, followed by mass confirmation using MALDI-ToF mass spectrometry and characterized by nuclear magnetic resonance and fluorescence spectroscopy. The peptide antioxidant capacity was demonstrated through FRAP and DPPH assays. Our data indicate that the presence of peptide slightly slows down the polyurethane ability to form hydrogels at salt concentration higher than 150 mM. Moreover, the gel formed in the presence of octapeptide can release FAD much faster than NADPH. Preferential weak interactions between peptide and polyurethane structures increase FAD releasing capacity. Our findings will pave the way for the development of new biocompatible materials containing an antioxidant peptide and FAD, a cofactor that modulates the antioxidant function of multiple enzymes simultaneously. These controlled-release platforms created by simple mixing may be suitable for injectable formulation.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"207 ","pages":"Article 106131"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methoxyl-Containing Hyper-Crosslinked Polymer from Largely Bio-Based Biphenyl Methyl Ether and Its Application in Lithium-Sulfur Battery

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2024.106139

Apparav K. Wale , Anoushka K. Das , Nita R. Patil , Manjusha V. Shelke , Ashootosh V. Ambade , Prakash P. Wadgaonkar

{"title":"Methoxyl-Containing Hyper-Crosslinked Polymer from Largely Bio-Based Biphenyl Methyl Ether and Its Application in Lithium-Sulfur Battery","authors":"Apparav K. Wale , Anoushka K. Das , Nita R. Patil , Manjusha V. Shelke , Ashootosh V. Ambade , Prakash P. Wadgaonkar","doi":"10.1016/j.reactfunctpolym.2024.106139","DOIUrl":"10.1016/j.reactfunctpolym.2024.106139","url":null,"abstract":"<div><div>A new biphenyl methyl ether <em>viz</em> 2,2′,3,3′-tetramethoxy-5,5′-bis(methoxymethyl)-1,1′-biphenyl (TBMB) was synthesized starting from vanillin <em>via</em> three-step reaction sequence. The self-polycondensation of TBMB by employing two Bronsted acid catalysts, <em>viz</em>, <em>p-</em>toluenesulfonic acid (PTSA) and trifluoromethanesulfonic acid (TFSA) led to the formation of organic hyper-crosslinked polymers (HCPs) containing built-in methoxyl groups. HCPs were characterized by FTIR, solid state <sup>13</sup>C NMR, XPS, XRD, TGA, BET, and FESEM analysis techniques. HCPs synthesized using PTSA (HCP-PTSA) and TFSA (HCP-TFSA) exhibited a Brunauer–Emmett–Teller (BET) surface area of 480 ± 5 and 590 ± 4 m<sup>2</sup>/g, respectively and consisted of hierarchical pore structures with both micropores and mesopores. HCP-TFSA was evaluated as an active coating layer on conventional polypropylene (PP) separator in lithium-sulfur batteries to suppress the polysulfide shuttling on account of the ability of methoxyl groups to anchor soluble polysulfide species <em>via</em> coordination. The significant polysulfide adsorption capacity and improved cycling stability with a capacity of 617.2 mAh g<sup>−1</sup> at 0.5C and 99% capacity retention highlighted the potential of porous HCP containing built-in methoxyl groups in the development of attractive lithium-sulfur battery systems.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"207 ","pages":"Article 106139"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of chain extension and clay reinforcement on PLA nanocomposite foams

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2025.106183

Ethan A. Crawford, Tizazu H. Mekonnen

{"title":"Effects of chain extension and clay reinforcement on PLA nanocomposite foams","authors":"Ethan A. Crawford, Tizazu H. Mekonnen","doi":"10.1016/j.reactfunctpolym.2025.106183","DOIUrl":"10.1016/j.reactfunctpolym.2025.106183","url":null,"abstract":"<div><div>The effects of chain extension and nanoclay incorporation on the foamability of poly(lactic acid) (PLA) were investigated using supercritical CO<sub>2</sub> as the blowing agent in a batch setting. Multifunctional epoxide styrene-acrylic (Joncryl) chain extended PLA samples loaded with 0–3 wt% of nanoclay were prepared. Parallel plate rheology and differential scanning calorimetry verified the chain extension of the reactive process, indicating a 315 % increase in molecular weight and corresponding entanglement. Polarized optical microscopy showed the effect of chain extension and nanoclay incorporation on the crystallization and crystallization rate of the PLA. The batch foamed samples via supercritical CO<sub>2</sub>, showed a 304 % increase in the expansion ratio and corresponding to 76 % decrease in density after chain extension. Increasing nanoclay incorporation led to slight decreases in expansion, which eventually caused cell collapse at the higher loading levels. The mechanical and thermal insulation properties of the nanocomposite foams improved 64 % and 6 %, respectively upon chain extension, and improved by 27 % and 10 % again with nanoclay incorporation until a threshold loading where poor foamability caused a deterioration in properties. Results of the study indicated that chain extension and employment of nanofillers can be an effective way to generate effective PLA foams with sustainability benefits for a range of commodity and engineering applications.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"209 ","pages":"Article 106183"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of magnetic molecular imprinted polymers based on deep eutectic solvent and its application in the specific adsorption and detection of fluoxetine hydrochloride

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2024.106122

Yanbo Tian, Liju Tan, Huiru Li, Yu Qiao, Na Wang, Jiangtao Wang

{"title":"Preparation of magnetic molecular imprinted polymers based on deep eutectic solvent and its application in the specific adsorption and detection of fluoxetine hydrochloride","authors":"Yanbo Tian, Liju Tan, Huiru Li, Yu Qiao, Na Wang, Jiangtao Wang","doi":"10.1016/j.reactfunctpolym.2024.106122","DOIUrl":"10.1016/j.reactfunctpolym.2024.106122","url":null,"abstract":"<div><div>Magnetic molecular imprinted polymers (MMIPs) for specific adsorption of fluoxetine hydrochloride (FXT) were prepared by using a new solvent, deep eutectic solvents (DESs) as the porogen, magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles modified twice as the carrier and methacrylic acid (MAA) as the functional monomer. The effects of DESs type, molar ratio of functional monomer to template molecule and amount of crosslinker on the adsorption properties of MMIPs were investigated. The characterization results showed that the optimized MMIPs is a rough porous material with a particle size between 300 and 500 nm, and the magnetic properties and thermal properties are satisfactory. The adsorption of MMIPs for FXT reached the equilibrium within 30 min. The equilibrium absorption capacity was 38.54 mg·g<sup>−1</sup> with an imprinting factor of 1.88. The constructed MMIPs showed good specificity and reusability. A rapid, simple and economical detection method for residual FXT in environmental water samples was established with the recovery rate between 94.4 and 102.2 %, and LOD and LOQ of 4.0 μg·L<sup>−1</sup> and 1.2 μg·L<sup>−1</sup>, respectively.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"207 ","pages":"Article 106122"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent advances in collagen-based hydrogels: Materials, preparation and applications

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2024.106136

Jialong She , Jinru Liu , Yanlu Mu , Shenghua Lv , Jiahao Tong , Leipeng Liu , Tingxiang He , Jiaqi Wang , Dequan Wei

{"title":"Recent advances in collagen-based hydrogels: Materials, preparation and applications","authors":"Jialong She , Jinru Liu , Yanlu Mu , Shenghua Lv , Jiahao Tong , Leipeng Liu , Tingxiang He , Jiaqi Wang , Dequan Wei","doi":"10.1016/j.reactfunctpolym.2024.106136","DOIUrl":"10.1016/j.reactfunctpolym.2024.106136","url":null,"abstract":"<div><div>Collagen is a three-dimensional polymer helical fibrous protein with good bioactivity, biocompatibility, reparability and affinity. Hydrogels made from collagen have been widely used in research fields such as biomedicine, flexible sensing and food engineering because of their good biocompatibility, degradability, low toxicity and low cost. This paper discusses the classification, extraction and modification techniques of collagen as well as the different methods of preparation of collagen-based hydrogels, which are mainly categorized into physical and chemical cross-linking methods. In addition, various unique properties of collagen-based hydrogels such as hydrophilicity, mechanical properties, porosity and degradability are analyzed and discussed. Finally, the various functional properties of collagen-based hydrogels and their cutting-edge applications in biomedicine, food engineering, smart sensing and adsorbent materials are summarized. The research progress of this special biomass material in various fields is shown in detail, and the problems in the current applications are pointed out and solutions are proposed. Herein, the preparation, properties and applications of collagen-based hydrogels are described in detail, the current status of research is analyzed, and the future development trend is prospected, expecting that collagen-based hydrogels will be more widely used in the future.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"207 ","pages":"Article 106136"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polystyrene-based fluorinated ionic receptor for selective removal of perfluoroalkyl contaminants from water

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2024.106138

Sushant P. Sahu , Oluwaseun T. Adeleye , Samuel Antwi , Fabrizio Donnarumma , Nagapradeep Nidamanuri , Rahul Bhise , Eknath Gadekar , Sanjay Sharma , Radhey Srivastava , Yu Wang

{"title":"Polystyrene-based fluorinated ionic receptor for selective removal of perfluoroalkyl contaminants from water","authors":"Sushant P. Sahu , Oluwaseun T. Adeleye , Samuel Antwi , Fabrizio Donnarumma , Nagapradeep Nidamanuri , Rahul Bhise , Eknath Gadekar , Sanjay Sharma , Radhey Srivastava , Yu Wang","doi":"10.1016/j.reactfunctpolym.2024.106138","DOIUrl":"10.1016/j.reactfunctpolym.2024.106138","url":null,"abstract":"<div><div>Even at very low concentrations, <em>per</em>- and polyfluoroalkyl substances (PFAS) pose a serious threat to human and animal health. Significant efforts have been made to develop water remediation technology for removing PFAS from the environment and groundwater, while also minimizing their discharge into the environment owing to their ubiquitous presence in consumer goods worldwide. In the context of developing selective ion-exchange polymers for PFAS remediation, this work reports the design of polystyrene-based fluorinated anion-exchange polymer bearing quaternary tetraaryl phosphonium cation moieties. The polymer was intended for high-performance and highly selective removal of commonly found PFAS contamination, such as perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), and hexafluoropropylene oxide-dimer acid (HFPO-DA, trade name GenX for the corresponding ammonium salt), at environmentally relevant concentrations from deionized water, drinking water and lake water (Lake Martin, Louisiana). Rapid removal of PFAS from different water matrices with more than 90 % efficiency at 1 ppb starting concentration was observed. The ionic fluoropolymer designed herein favors PFOA, PFOS, and GenX anions over other competing inorganic anions or organic species in solution via irreversible anion exchange which was assisted by strong hydrophobic interactions with the fluorophilic polymer's backbone. The synthesis of the polymer, its structural characterization, and its function in the removal of PFAS in real water matrices were discussed. The findings of this study are significant for developing water purification systems that aim to selectively and rapidly separate perfluoroalkyl compounds from waters at environmental concentrations and beyond.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"207 ","pages":"Article 106138"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Black liquor derived lignin adsorbents for removal of organic pollutants from water

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2025.106185

Hande Barkan Öztürk , Philip Verdross , Alexander Bismarck

{"title":"Black liquor derived lignin adsorbents for removal of organic pollutants from water","authors":"Hande Barkan Öztürk , Philip Verdross , Alexander Bismarck","doi":"10.1016/j.reactfunctpolym.2025.106185","DOIUrl":"10.1016/j.reactfunctpolym.2025.106185","url":null,"abstract":"<div><div>We present the preparation of lignin particles from raw black liquor and their chemical modification, so that they can be used as efficient adsorbents to remove organic pollutants from water. For the production of adsorbent powders, pristine black liquor (as obtained from a pulping mill) was emulsified with epichlorohydrin and Span 80 and cured at elevated temperatures. Phospinic esters and organic sulphates were synthetically introduced to the lignin-backbone to modify the adsorbents. The adsorption of organic model compounds, Paraquat, p-nitrophenol, and malachite green were studied. Kinetic and thermodynamic data of the adsorption processes was obtained experimentally and by fitting mathematical models (Langmuir and Freundlich isotherms). Adsorbents showed adsorption capacities of <em>Q</em><sub><em>e</em></sub> = 62 mg/g for Paraquat, <em>Q</em><sub><em>e</em></sub> = 199 mg/g for p-nitrophenol, and <em>Q</em><sub><em>e</em></sub> = 1200 mg/g for malachite green in batch-adsorption experiments. These values are among the highest for any of the model compounds presented in literature. Adsorption occurred reasonably fast for all compounds, reaching plateau-adsorption within minutes to hours.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"209 ","pages":"Article 106185"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High glass transition catalyst-free polybenzoxazine vitrimer through one-pot solventless method

IF 4.5 3区工程技术

Reactive & Functional Polymers Pub Date : 2025-02-01 DOI: 10.1016/j.reactfunctpolym.2025.106186

Festus Ifeanyi Anagwu , Eleftheria Dossi , Alexandros A. Skordos

{"title":"High glass transition catalyst-free polybenzoxazine vitrimer through one-pot solventless method","authors":"Festus Ifeanyi Anagwu , Eleftheria Dossi , Alexandros A. Skordos","doi":"10.1016/j.reactfunctpolym.2025.106186","DOIUrl":"10.1016/j.reactfunctpolym.2025.106186","url":null,"abstract":"<div><div>A high glass transition polybenzoxazine has been synthesised by a one-pot solventless method via the Mannich condensation of a phenolic disulphide, paraformaldehyde and aniline. The solventless process reduces synthesis time, material costs, and the need for post-synthesis purification. The polybenzoxazine exhibits a glass transition temperature (<em>T</em><sub><em>g</em></sub>) of 155°C and thermosetting behaviour below this temperature. Dynamic disulphide bond metathesis associated with a topological freezing temperature of 78°C and an activation energy of 127 kJ mol<sup>–1</sup> delivers vitrimeric functionality with fast, catalyst-free stress relaxation above <em>T</em><sub><em>g</em></sub>. This material fully relaxes stress within 5 s at 190°C, with thermal degradation beginning above 250°C. It exhibits a glassy modulus of 3.6 GPa, high char yield (57.4%) translating to a high limiting oxygen index (<em>LOI</em>) of 40.5% and excellent environmental resistance, as evidenced by low water uptake (1.4%) after immersion at 75°C for 31 days. The combination of environmental resistance, due to thermosetting character, high glass transition, facile synthesis, high char yield, good processability, and fast stress relaxation position this polybenzoxazine as a promising candidate matrix system for repairable aerospace thermosetting continuous fibre composites.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"209 ","pages":"Article 106186"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0