Polymer最新文献_第3页

Unique properties of flow-drawn epoxy fibers

IF 4.6 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128406

Israel Greenfeld, Mark Shneider, Ulyana Shimanovich, H. Daniel Wagner

{"title":"Unique properties of flow-drawn epoxy fibers","authors":"Israel Greenfeld, Mark Shneider, Ulyana Shimanovich, H. Daniel Wagner","doi":"10.1016/j.polymer.2025.128406","DOIUrl":"https://doi.org/10.1016/j.polymer.2025.128406","url":null,"abstract":"Epoxy micro and nano fibers prepared from a solution by extensional flow, using newly-developed mechanical and electrical drawing techniques, were recently shown to exhibit remarkable mechanical stiffness. In the current study, we investigate the ultimate strength and ductility of these fibers. The flow-induced high extension is shown to increase these properties well beyond those of bulk epoxy because of the molecular orientation and rearrangement of branching polymer clusters. At the same time, due to volume conservation and tighter molecular packing, when the extension is increased the fiber diameter gets progressively smaller. The mechanical properties are predicted to correlate with the fiber diameter via inverse-square power laws, reflecting the simultaneous molecular alignment and diameter shrinkage. This size-dependence phenomenon starts at a critical diameter, unique to the resin composition and drawing conditions, leading to a steep rise in strength and stiffness for fiber diameters thinner than the critical diameter. The strength and ductility analysis is corroborated by experimental testing of epoxy fibers prepared by extensional flow and may apply to other thermoset polymers, demonstrating the potential to manipulate mechanical properties by controlling the curing and drawing processes.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"120 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fully physically crosslinked supramolecular hydrogel with high tensile strength, low hysteresis, high adhesivity and frost resistance based on confinement effect

IF 4.1 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128404

Mingqiang Hu , Dezhan Ye , Xing Qian , Yanhu Zhan , Xiancai Jiang

{"title":"Fully physically crosslinked supramolecular hydrogel with high tensile strength, low hysteresis, high adhesivity and frost resistance based on confinement effect","authors":"Mingqiang Hu , Dezhan Ye , Xing Qian , Yanhu Zhan , Xiancai Jiang","doi":"10.1016/j.polymer.2025.128404","DOIUrl":"10.1016/j.polymer.2025.128404","url":null,"abstract":"<div><div>Traditional ionic conductive hydrogel was prepared by chemically crosslinking the polymer chains to form network. However, the chemically crosslinked ionic conductive hydrogel usually showed limited elongation at break and high hysteresis during stretching process. Here, a simple strategy of synthesizing fully physically crosslinked ionic conductive supramolecular hydrogel without chemical crosslinker was purposed. Hydrophilic salt not only act as the ion supplier, but also provide the spatial confinement effect to form the completely physically crosslinked hydrogel. Firstly, CaCl<sub>2</sub> was used as the representative salt. The optimal PVA/PAM/CaCl<sub>2</sub> ionic conductive hydrogel (PPC), showed excellent tensile performance (2400.3 ± 140.63 %), anti-freezing performance (−28.8 °C), high conductivity (4.8 ± 0.01 S/m), excellent stability at room temperature, low hysteresis, and high transparency. The conductivity of PPC showed no sensitivity to the tensile strain. This innovative combination enables PPC ionic conductive hydrogel to have extraordinary versatility. The flexible all-solid-state supercapacitor assembled with PPC ionic conductive hydrogel as the electrolyte has a high area specific capacitance (136.9 mF/cm<sup>2</sup>). The prepared supercapacitor can maintain good stability under certain tensile deformation (The capacitance retention rate was 87.7 % when stretched at 200 %). Moreover, other high hydrophilic salts including LiCl, ZnCl<sub>2</sub>, MgCl<sub>2</sub> and AlCl<sub>3</sub> were used to prepare ionic conductive PVA/PAM hydrogel to verify the universality of this preparation method.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128404"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vat photopolymerization of semicrystalline polymers: Effects of crosslinking on crystallinity

IF 4.1 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128407

Priyangika Pitawala, Michael A. Hickner

{"title":"Vat photopolymerization of semicrystalline polymers: Effects of crosslinking on crystallinity","authors":"Priyangika Pitawala, Michael A. Hickner","doi":"10.1016/j.polymer.2025.128407","DOIUrl":"10.1016/j.polymer.2025.128407","url":null,"abstract":"<div><div>In vat photopolymerization (VP), a crosslinked polymer network can enhance the dimensional stability and modulus of printed parts, but semicrystalline materials have not been extensively studied in VP. This work explores a semicrystalline polymer system suitable for VP, consisting of the monomers 1,6-hexanedithiol (HDT) and diallyl terephthalate (DAT), which was crosslinked using triallyloxy-1,3,5-triazine (TAT). While crosslinking improves certain mechanical properties, it can also restrict the formation of crystalline domains, thereby affecting material performance. Additionally, crosslinking can slow crystallization kinetics by influencing chain mobility. Therefore, to gain insight into the crystallization and recrystallization behavior of the HDT-DAT polymer, networks crosslinked with 0, 2, 5, 10, and 20 mol % of TAT in bulk form and printed using VP were compared. Differential scanning calorimetry (DSC) was employed to assess the crystalline and recrystallization behaviors, and X-ray diffraction was used to analyze samples with 20 mol % of crosslinker. It was found that at crosslinker concentrations of 5 mol % or higher, longer recrystallization times (over 20 h) are required to reestablish ordered crystalline regions in bulk polymerized films. In contrast, 3D printed specimens with similar compositions exhibited significantly shorter recrystallization times during annealing at room temperature, which can be attributed to their lower degree of crosslinking as evidenced by the lower gel fraction in the 3D printed samples.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128407"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancement of mechanical properties of TATB-based polymer bonded explosive by surface grafting polymer brushes 通过表面接枝聚合物刷提高基于 TATB 的聚合物粘合炸药的机械性能

IF 4.6 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128401

Shengjun Zheng, Chengcheng Zeng, Jianhu Zhang, Yajun Luo, Feiyan Gong, Fude Nie

{"title":"Enhancement of mechanical properties of TATB-based polymer bonded explosive by surface grafting polymer brushes","authors":"Shengjun Zheng, Chengcheng Zeng, Jianhu Zhang, Yajun Luo, Feiyan Gong, Fude Nie","doi":"10.1016/j.polymer.2025.128401","DOIUrl":"https://doi.org/10.1016/j.polymer.2025.128401","url":null,"abstract":"Improving the interfacial interaction between explosive crystals and the polymeric binder was essential for enhancing the mechanical properties of polymer bonded explosives (PBXs). In this study, the surface of the 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) crystal was initially coated with a polydopamine (PDA) layer, which served as an active platform for anchoring the 2-bromoisobutyryl bromide as an ATRP initiator; then, the co-polymer chains composed of Acrylonitrile(AN), 2-Hydroxyethyl methacrylate (HEMA) and 2-(Dimethylamino)ethyl methacrylate (DMAEMA) were grown through surface-initiated atom transfer radical polymerization (SI-ATRP) from the surface of TATB modified with ATRP initiator. The formation of the PDA, ATRP initiator and polymer brush coating layer on the surface of TATB was confirmed through SEM, TEM, XPS and contact angle tests. After incorporating a rigid-flexible gradient interface structure composed of PDA and polymer brush layer, the PBXs exhibited enhanced mechanical strength and creep resistance. Compared with the pristine TATB-based PBXs, the static mechanical properties, including tensile and compressive strength, of TATB@PDA@PAN-co-PHEMA-co-PDMAEMA based PBXs were increased by 36.7% and 23.9%, respectively. The maximum creep strain decreased by 39.4% at 30 °C and 14.6% at 75 °C. Additionally, the coefficient of thermal expansion decreased by 8.37%. This study presents an universal method for enhancing the mechanical properties of PBX by integrating PDA chemistry with SI-ATRP.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"96 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Moving Beyond Organosilanes: Tris(hydroxymethyl)aminomethane as a Superior Surface Modifier for Zirconia in NBR Composites

IF 4.6 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128405

Surabhi S. Raut, Shubham C. Ambilkar, Bharat P. Kapgate, Amit Das, Subhradeep Mandal, Anik Kumar Ghosh, Chayan Das

{"title":"Moving Beyond Organosilanes: Tris(hydroxymethyl)aminomethane as a Superior Surface Modifier for Zirconia in NBR Composites","authors":"Surabhi S. Raut, Shubham C. Ambilkar, Bharat P. Kapgate, Amit Das, Subhradeep Mandal, Anik Kumar Ghosh, Chayan Das","doi":"10.1016/j.polymer.2025.128405","DOIUrl":"https://doi.org/10.1016/j.polymer.2025.128405","url":null,"abstract":"This study investigates the potential of Tris(hydroxymethyl)aminomethane (Tris) as a surface modifier for zirconia to enrich the ultimate properties of nitrile rubber (NBR) composites. By substituting commonly used organosilanes with Tris to modify the surface of zirconia, significant improvement in zirconia particle dispersion within the NBR matrix is achieved, leading to a stronger rubber-filler interaction. Scanning electron microscopy (SEM) images reveal a finer dispersion of zirconia particles, facilitated by the efficient surface modification of zirconia by Tris. Rubber-filler interactions, examined through the Lorenz-Park principles and viscoelastic properties, demonstrate that Tris modification reduces the surface energy of zirconia, enhancing its dispersibility and improving interfacial bonding between the rubber and the zirconia due to increased reactivity. This causes significant improvement in mechanical and other composite properties such as thermal stability, oil resistance, flame retardancy for the Tris modified <em>in situ</em> zirconia filled composites. Among the compositions examined, the composite containing 2 phr of Tris and 30 phr of zirconia (In-2T-Zr-30) exhibits a substantial improvement in tensile strength, over 20 times higher than that of the unfilled sample. These findings highlight the potential of Tris as an effective surface modifier for zirconia, enhancing filler performance and offering a promising alternative to organosilanes in the development of high-performance nitrile rubber composites","PeriodicalId":405,"journal":{"name":"Polymer","volume":"60 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rational design of glycidyl azide polymer-based triblock copolymers for high-performance energetic thermoplastic elastomers

IF 4.1 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128403

Ming-Yen Tsai , Ming-Chieh Lin , Shih-Ya Hong , Yi-Chen Wu , Mohamed Gamal Mohamed , Shiao-Wei Kuo

{"title":"Rational design of glycidyl azide polymer-based triblock copolymers for high-performance energetic thermoplastic elastomers","authors":"Ming-Yen Tsai , Ming-Chieh Lin , Shih-Ya Hong , Yi-Chen Wu , Mohamed Gamal Mohamed , Shiao-Wei Kuo","doi":"10.1016/j.polymer.2025.128403","DOIUrl":"10.1016/j.polymer.2025.128403","url":null,"abstract":"<div><div>In aerospace applications, such as rockets and missiles, using thermoplastic elastomers (TPEs) in rocket propellants offers favorable properties that may allow them to replace traditional thermosetting elastomers. This study investigates the synthesis of energetic thermoplastic elastomers (ETPEs) with energetic characteristics, specifically focusing on synthesizing glycidyl azide polymer (GAP) ETPE and the effect of varying hard segment ratios on their physical properties. However, only the presence of azide side chains negatively impacts the mechanical properties of the ETPE and to address this issue, an ABA triblock copolymer synthesis approach is employed, utilizing poly (<em>ε</em>-caprolactone) (PCL) long linear chains to modify the original GAP, forming PCL-GAP-PCL ETPE. The introduction of PCL-GAP-PCL triblock copolymers significantly enhanced the mechanical properties of the resulting ETPE, providing substantial benefits for its use in specific environments. Furthermore, this study also investigates the effects of varying soft/hard segment ratios in the ETPE, suggesting that the subsequent incorporation of oxidizer fillers could yield favorable mechanical properties. Additionally, 2D infrared spectroscopy (2D-IR) was utilized to understand the effects of hydrogen bond formation and dissociation.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128403"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transparent polyimides derived from phenyl group substituted 2,2′-bis(trifluoromethyl)benzidines with low dielectric constant at high frequencies

IF 4.1 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128393

Lei Yang , Jinglei Xing , Xingzhong Fang , Guofei Chen

{"title":"Transparent polyimides derived from phenyl group substituted 2,2′-bis(trifluoromethyl)benzidines with low dielectric constant at high frequencies","authors":"Lei Yang , Jinglei Xing , Xingzhong Fang , Guofei Chen","doi":"10.1016/j.polymer.2025.128393","DOIUrl":"10.1016/j.polymer.2025.128393","url":null,"abstract":"<div><div>With the rapid advancement of 5G communication, polyimides, currently employed as an insulating interlayer material in commercial applications, can no longer fulfill the low dielectric constant and low dielectric loss requirements imposed by high-frequency signals. To solve this problem, increasing the free volume between molecular chains is a practical and effective way to achieve the low dielectric constant of polyimides. In this work, two novel diamines with different bulky phenyl groups at <em>ortho</em> position of the amino group of 2,2′-bis(trifluoromethyl)benzidine (TFDB) were designed and synthesized successfully through electrophilic substitution and Suzuki-Miyaura coupling. Then a series of polyimides were prepared with these diamines and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). All polyimides exhibited glass transition temperatures of 318–351 °C, excellent optical transmittances of 82.5–85.9 % at 400 nm, and low dielectric constants of 2.30–2.65 at 11 GHz. And they showed good solubility and hydrophobicity. The PI-5 exhibited the best dielectric properties with a dielectric constant of 2.30 and a dielectric loss of 0.0037 at 11 GHz, demonstrating promising application prospects in high-frequency communication.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128393"},"PeriodicalIF":4.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unraveling the semi-interpenetration with conducting polymer of electroresponsive click-hydrogels made of hyaluronic acid via molecular dynamics simulations

IF 4.1 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128395

David Zanuy , Víctor Castrejón-Comas , Joel Sánchez-Morán , Adrian Fontana-Escartín , Marc Arnau , Maria M. Pérez-Madrigal , Carlos Alemán

{"title":"Unraveling the semi-interpenetration with conducting polymer of electroresponsive click-hydrogels made of hyaluronic acid via molecular dynamics simulations","authors":"David Zanuy , Víctor Castrejón-Comas , Joel Sánchez-Morán , Adrian Fontana-Escartín , Marc Arnau , Maria M. Pérez-Madrigal , Carlos Alemán","doi":"10.1016/j.polymer.2025.128395","DOIUrl":"10.1016/j.polymer.2025.128395","url":null,"abstract":"<div><div>Electroresponsive hydrogels have been prepared by semi-interpenetrating a hyaluronic acid-based click-hydrogel (clickHA) with different concentrations of poly(hydroxymethyl-3,4-ethylenedioxythiophene) (PEDOT-MeOH). The morphology of the resulting hydrogels, which showed excellent electrochemical response, consisted in a homogeneous distribution of PEDOT-MeOH nanoparticles decorating the pore well of the honeycomb-like clickHA hydrogel. In order to investigate this particular organization, atomistic molecular dynamics simulations have been conducted on clickHA hydrogels with and without hydroxymethyl-3,4-ethylenedioxythiophene (EDOT-MeOH) monomers. Results have shown that, while EDOT-MeOH molecules do not affect the physical and structural characteristics of clickHA, infiltrated monomers rapidly tend to aggregate inside the hydrogel, forming small clusters stabilized by π-π stacking interactions. These clusters probably act as polymerization nuclei for the formation of PEDOT-MeOH nanoparticles, which explains not only the morphology observed but also the remarkable electrochemical response of clickHA/PEDOT-MeOH hydrogels.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128395"},"PeriodicalIF":4.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheology of ethylene-vinyl acetate composites tuned by crosslinked rubber particles and carbon nanotubes 通过交联橡胶颗粒和碳纳米管调节乙烯-醋酸乙烯酯复合材料的流变性能

IF 4.1 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128400

Zhaopeng Hu , Xin Jiang , Benteng Liu , Qiao Li , Hongda Meng , Yihu Song , Yongzhong Bao , Qiang Zheng

{"title":"Rheology of ethylene-vinyl acetate composites tuned by crosslinked rubber particles and carbon nanotubes","authors":"Zhaopeng Hu , Xin Jiang , Benteng Liu , Qiao Li , Hongda Meng , Yihu Song , Yongzhong Bao , Qiang Zheng","doi":"10.1016/j.polymer.2025.128400","DOIUrl":"10.1016/j.polymer.2025.128400","url":null,"abstract":"<div><div>Rheology of polymer composites is crucial for production efficiency and performance of final products. Investigated here is influence of crosslinked rubber particles (CRPs) and carbon nanotubes (CNTs) on rheology of ethylene-vinyl acetate (EVA) composites. Transmission electron microscopy shows that CNTs are enriched in the EVA phase and do not penetrate into the CRPs. The reinforcement profiles of CRPs and CNTs are analyzed with the aid of time-concentration superposition principle, indicating that the reinforcement effects of these fillers are additive. While CNTs intensify and accelerate strain softening, CRPs are able to delay and weaken this effect. The synchronous evaluation of electrical resistance and rheology reveals that the conductive and rheological percolation networks are not entirely equivalent. The addition of CRPs improves elasticity and rheological and electrical recoveries of CNTs-based composites. The findings suggest that the combination of the two fillers synergistically improves composite properties, offering a foundation for optimizing advanced processing and application requirements.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128400"},"PeriodicalIF":4.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient synthesis of polyethylene wax using 8-(arylimino)-5,6,7-trihydroquinoline SiO2-supported heterogeneous nickel catalysts

IF 4.6 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128367

Shan Xu, Hu Xu, Mengna Lei, Hu Xue, Pei Li, Chao Li, Ao Chen, Fuzhou Wang

{"title":"Efficient synthesis of polyethylene wax using 8-(arylimino)-5,6,7-trihydroquinoline SiO2-supported heterogeneous nickel catalysts","authors":"Shan Xu, Hu Xu, Mengna Lei, Hu Xue, Pei Li, Chao Li, Ao Chen, Fuzhou Wang","doi":"10.1016/j.polymer.2025.128367","DOIUrl":"https://doi.org/10.1016/j.polymer.2025.128367","url":null,"abstract":"In this contribution, a series of nickel complexes based on 8-(arylimino)-5,6,7-trihydroquinoline (<strong>Ni1</strong>-<strong>Ni4</strong>) were designed and synthesized. These complexes exhibited high activity of up to 9.0 ×10<sup>6</sup> g·PE/mol Ni·h<sup>-1</sup> in ethylene polymerization on treatment with of Et<sub>2</sub>AlCl and producing highly branched polyethylene wax (branching numbers range from 66 to 82/1000C). To further improve the performance of these nickel catalysts, the SiO<sub>2</sub>-supported catalyst of <strong>Ni4</strong> was prepared, which presented better performance compared to homogeneous systems. Especially, the heterogeneous catalysts could further improve activity of up to 16.2 × 10<sup>6</sup> g·PE/mol Ni·h<sup>-1</sup>, and thermal stability (activity of <strong>Ni4-Na@SiO</strong><sub><strong>2</strong></sub> up to 9.0 × 10<sup>6</sup> g·PE/mol Ni·h<sup>-1</sup> at 75 °C) through ionic anchoring strategy. The morphology of polyethylene wax obtained by supported catalyst was also controllable. This work may provide an efficient and practical method for preparing polyethylene wax using late-transition metal catalysts.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"23 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0