Journal of Polymer Research最新文献

{"title":"Investigation on the mechanical, water absorption, and tribological performance of calotropis gigantea and abaca fiber reinforced epoxy composites","authors":"G. Jeya Pandi,&nbsp;K. Raja,&nbsp;V. Vijayan,&nbsp;S. Sudhagar","doi":"10.1007/s10965-024-04157-3","DOIUrl":"10.1007/s10965-024-04157-3","url":null,"abstract":"<div><p>The mechanical qualities of natural fiber (NF) -based polymer composites are superior, making them advantageous and these composites are environmentally beneficial. The current investigation involved the fabrication of hybrid composites using Calotropis gigantea (CGF) and Abaca Fiber (AF) as reinforcements in epoxy matrix. The hand layup technique was employed for the fabricating process. Subsequently, the composites were investigated and analysed for their water absorption rate, tribological performance, and mechanical properties. This study aims to uncover a noteworthy combination of NF reinforced polymer composites that can be utilized in commercial Engineering applications. The mechanical properties were examined by measuring their hardness, impact resistance, flexural strength (FS), Compressive strength (CS), and tensile strength (TS). Furthermore, the broken surfaces of tensile sample were inspected utilizing a scanning electron microscope. Composite specimens were immensed in distilled water and their water penetration percentages were measured to ascertain their water absorption (WA) properties. The tribological performance was analysed utilizing a pin-on-disc equipment to assess the specific wear rate and coefficient of friction. The outcomes demonstrated that the hybrid composites surpassed the single-fiber composites in all variations. Sample G exhibited superior properties in all combinations, with a TS of 36.19 MPa and tensile modulus of 328.95 MPa. Additionally, it shows that higher flexural strength of 43.85 MPa and flexural modulus values of 350.84 MPa. Furthermore, it demonstrated higher Compressive strength of 94.45 MPa and modulus values of 576.93 MPa. Moreover, it exhibited a higher impact value of 53.88 kJ/m² and higher hardness value of 44.07 HV. This material is well-suited for non-structural uses in electronics and electrical insulating boards and components, as the results show that a combination of CGF and AF fibers with an epoxy matrix improves mechanical qualities.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance of heat-resisting functional polypropylene/hollow silica substrates for 6th generation wireless communication","authors":"Kai-ru Yang,&nbsp;Shuang Ouyang,&nbsp;Ning Ma,&nbsp;Tim Hsu,&nbsp;Ya-qiong Huang,&nbsp;Jen-taut Yeh","doi":"10.1007/s10965-024-04147-5","DOIUrl":"10.1007/s10965-024-04147-5","url":null,"abstract":"<div><p>The effects of density and shape of hollow silica (functionalized silica hollow tubes (FSHT) or hollow glass microspheres (FHGM)) on dielectric constant (ε_r) and dielectric loss (tan δ) of hindered phenol (HP) grafted functional polypropylene (FPP)/FSHT, heat-treated FPP (HTFPP)/FSHT, FPP/FHGM or HTFPP/FHGM substrate films were systematically investigated. The dielectric or free-volume-hole characteristics of FPP/FSHT, FPP/FHGM, HTFPP/FSHT, or HTFPP/FHGM films decrease to a minimum, as FSHT or FHGM contents approach an optimal value of 4wt% or 8wt%, respectively, and their dielectric or free-volume-hole characteristics decrease or increase gradually with increasing HP molar%. The minimum ε_r and tan δ of FPP/FSHT or HTFPP/FSHT films decrease significantly with decreasing FSHT’s densities. By filling with 0.46 g/cm³ identical density of hollow silica fillers, the minimum ε_r or tan δ procured for FPP/FSHT or HTFPP/FSHT films are somewhat smaller than those of corresponding FPP/FHGM or HTFPP/FHGM films. The linear coefficient of thermal expansion (LCTE) or onset degradation temperature (DT_onset) of FPP/FSHT, HTFPP/FSHT, FPP/FHGM or HTFPP/FHGM films reduce or increase visibly with increasing FSHT or FHGM contents, respectively. All DT_onset values of HTFPP/hollow silica films are ~ 150℃ higher than those of conventional PP polymers. Satisfactorily low ε_r/tan δ (1.74/0.0019, 1.83/0.0020, 1.83/0.0024 and 1.92/0.0028 at 1 MHz), LCTE (95 × 10^–6/℃, 89 × 10^–6/℃, 80 × 10^–6/℃ and 74 × 10^–6/℃) and pleasing heat-resisting properties for 6G ultrarapid communication are acquired for properly prepared FPP/FSHT, HTFPP/FSHT FPP/FHGM or HTFPP/FHGM substrate films having 1.2 HP molar% and 0.46 g/cm³ density of FSHT and FHGM fillers. Probable reasons accounting for these reduced dielectric, LCTE and improved heat-resisting characteristics are proposed.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative evaluation of the hydrogen bonding effects on the crystallization kinetics of poly(vinyl alcohol)/tea polyphenol composites","authors":"Xiao He,&nbsp;Li-Hua Zhang,&nbsp;Qing Shen","doi":"10.1007/s10965-024-04156-4","DOIUrl":"10.1007/s10965-024-04156-4","url":null,"abstract":"<div><p>The crystallization kinetics behaviors of PVA (poly (vinyl alcohol))/TP (tea polyphenol) composites were studied. Results showed that the addition of TP component in PVA formed composites would reduce the crystallinity (%), leading to the formation of a lower Avrami exponent, <i>n</i>. Under the fixed cooling rate condition, the <i>n</i> values of Avrami and <i>α</i> values of Mo are both higher for the above composites with TP ingredient at 10–20%. Subsequently, the influence of the hydrogen bonding (H-bonding) in PVA/TP composites, pure PVA and non-hydrogen bonding (non-H-bonding) in such composites were further quantitatively assessed by analyzing the H-bonding factor, F%, in relation to different crystallization kinetic parameters including Avrami exponent <i>n</i>, <i>Z</i>_<i>t</i><i>, α</i> and <i>F(T)</i>. Results showed that the relationship of Avrami exponent <i>n</i> and <i>α</i> were presented as <b><i>n</i></b><b> = </b><b><i>-</i></b><i>a</i>_<i>1</i> + <i>b</i>_<i>1</i><b><i>F</i></b>^{<i>PVA/TP</i>}_{<i>H-bonding</i>}<i>-c</i>_<i>1</i><b><i>F</i></b>^{<i>2PVA/TP</i>}_{<i>H-bonding</i>} and <b><i>α</i></b><b> = </b><b><i>-</i></b><i>a</i>_<i>5</i> + <i>b</i>_<i>5</i><b><i>F</i></b>^{<i>PVA/TP</i>}_{<i>H-bonding</i>}<i>-c</i>_<i>5</i><b><i>F</i></b>^{<i>2PVA/TP</i>}_{<i>H-bonding</i>}<i>.</i> The Z_t was described as the functions like <b><i>Z</i></b>_{<b><i>t</i></b>} = <i>a</i>_<i>2</i><i>-b</i>_<i>2</i><i>e</i>^{<i>(</i><b><i>F</i></b><i>PVA/TP</i>}_{<i>H-bonding</i>}^<i>−c</i>_<i>2</i>^<i>)/d</i><i>, </i><b><i>Z</i></b>_{<b><i>t</i></b>}<b> = </b><b><i>-</i></b><i>a</i>_<i>3</i> + <i>b</i>_<i>3</i><b><i>F</i></b>^<i>PVA</i>_{<i>H-bonding</i>}<i>-C</i>_<i>3</i><b><i>F</i></b>^<i>2PVA</i>_{<i>H-bonding</i>}<i>,</i> and <b><i>Zt</i></b> = <i>a</i>_<i>4</i><i>(</i><b><i>F</i></b>_{<i>non-H-bonding</i>}<b><i>-</i></b><i>b</i>_<i>4</i><b><i>)</i></b>^<i>c</i>_<i>4</i>, respectively. The <i>F(T)</i> was presented as <b><i>F(T)</i></b><b> = </b><i>a</i>_<i>6-</i><i>b</i>_<i>6</i><b><i>F</i></b>^{<i>PVA/TP</i>}_{<i>H-bonding</i>+}<i>c</i>_<i>6</i><b><i>F</i></b>^{<i>2PVA/TP</i>}_{<i>H-bonding</i>}, where <i>a</i>, <i>b</i> and <i>c</i> are positive constants.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and physicochemical properties of doxorubicin-loaded PEGA containing amphiphilic block polymeric micelles","authors":"Pradeep Kumar Panda,&nbsp;Chen-Yan Hsieh,&nbsp;Yun-Tung Shen,&nbsp;Ya-Hui Tsai,&nbsp;Huang-Wen Tsai,&nbsp;Chao-Ling Yao,&nbsp;Yun Chen,&nbsp;Po-Chih Yang","doi":"10.1007/s10965-024-04153-7","DOIUrl":"10.1007/s10965-024-04153-7","url":null,"abstract":"<div><p>In this study, we aim to synthesize self-assembled amphiphilic diblock poly(PEGA-<i>b</i>-HEA-PCL) copolymers through RAFT living polymerization, targeting the delivery of hydrophobic anticancer drugs. The synthesized self-assembled diblock copolymers polymeric micelles (PMs) comprising poly(ethylene glycol) methyl ether acrylate (PEGA), as a hydrophilic segment and 2-hydroxyethyl acrylate-polyhexanoate monomer (HEA-PCL) with different block lengths, as a hydrophobic segment. The chemical structures, compositions, and self-assembled behavior were identified through ¹H NMR spectroscopy. The thermal stability was assessed through TGA and DSC. Furthermore, DOX was encapsulated into all PMs. The drug-loaded PMs exhibited enhanced drug release profiles in acidic medium. Particle diameter was measured through DLS and TEM techniques. The cell viability of diblock polymers and selected DOX-loaded PMs were evaluated against non-cancerous (L929) and cancerous cells (SK-N-AS), respectively, through well-known MTT assay. Micellar aggregates with mean diameters of approximately 127.2–145.3 nm formed in aqueous solution. The diameters of PMs increased to 141.5–173.1 nm upon the incorporation of DOX. The drug loading content and encapsulation efficiency of PMs were approximately 8.09–18.84% and 30.43–54.07%, respectively. The MTT assay results indicated that all synthesized materials had minimal effects on the viability of L929 cells, while DOX-loaded materials inhibited the viability of neuroblastoma cells by 68.7%. The highest drug release was 89.20% at pH 7.4, while 83.45% at pH 5.0 for 40 h. These findings suggest that the synthesized amphiphilic PMs are promising candidates for drug delivery systems.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142409640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and optical properties of polymeric complexes of europium based on polyvinylpyrrolidone derivatives - potential luminescent markers for bioimaging","authors":"Artem Aleksandrovich Selutin,&nbsp;Eugene Viktorovich Sivtsov,&nbsp;Ksenia Alekseevna Zhidomorova,&nbsp;Viktor Yurievich Bairamukov,&nbsp;Valery Dmitrievich Krasikov,&nbsp;Ksenia Igorevna Ilyina,&nbsp;Albert Radikovich Muslimov,&nbsp;Valeria Olegovna Laushkina,&nbsp;Alyona Igorevna Shakirova,&nbsp;Alexey Vladimirovich Eremin","doi":"10.1007/s10965-024-04137-7","DOIUrl":"10.1007/s10965-024-04137-7","url":null,"abstract":"<div><p>Polymeric derivatives of poly-N-vinylpyrrolidone containing different amounts of linker carboxylate ligands (partially hydrolyzed poly-N-vinylpyrrolidone with 5 mol% COOH groups and copolymers of N-vinylpyrrolidone with other monomers) were synthesized. The following copolymers were obtained: N-vinylpyrrolidone/crotonic acid and N-vinylpyrrolidone/N-vinylamidoanthanoic acid (containing 16 and 50 mol% COOH-groups). Metal-polymer complexes (MPC) with varying europium content were prepared through the interaction of the obtained polymers with equimolar amounts of hydroxocomplex Eu(Phen)₂(OH)₃ (Phen = 1,10-phenanthroline). The polymers and MPC were characterized by elemental analysis, IR, UV-vis spectroscopy and photoluminescence; their cytotoxicity toward living cells was estimated. All the obtained MPC exhibited photoluminescence with higher intensity than that of the reference complex Eu(Phen)₂Br₃. The dependence of luminescence intensity on the content of metallocenters in MPC was demonstrated. The relative quantum yield of luminescence was found to decrease with increasing europium content in MPC. It was shown that none of the polymers under investigation exhibited cytotoxicity. Furthermore, the presence of the polymeric anion in MPC contributed to a sharp decrease in the toxicity of metallocenter [Eu(Phen)₂]³⁺_solv. The MPC based on the N-vinylpyrrolidone/N-vinylamidoanthanoic acid copolymer exhibited no cytotoxicity within the entire investigated concentration range.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142409514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boron nitride nanosheets/epoxy nanocomposites with high thermal conductivity and high dielectric constant for energy storage applications","authors":"Brij Mohan Bharti,&nbsp;Kartikeya Dixit,&nbsp;Niraj Sinha","doi":"10.1007/s10965-024-04142-w","DOIUrl":"10.1007/s10965-024-04142-w","url":null,"abstract":"<div><p>Owing to their ability to provide thermal conduction as well as electrical insulation properties that are required for modern electronic devices and electrical systems, nano-fillers incorporated epoxy composites are being widely investigated. In this study, epoxy composites have been reinforced with boron nitride nanosheets (BNNSs) to achieve enhanced thermal conductivity and dielectric properties. Further, their change as a function of BNNSs concentration (weight %) has been investigated. BNNSs are synthesized using the bottom-up approach, while the nanocomposites of epoxy and BNNSs are fabricated with the help of a process involving stirring and ultrasonication. The results reveal that the incorporation of BNNSs leads to enhancement of thermal conductivity of the nanocomposites and it increases with an increase in the loading of BNNSs. The increase in thermal conductivity is 1.93 W/mK with 15 weight % of BNNSs, that is ~ 865% improvement over the pure epoxy. Also, an approximately 123% increase in dielectric constant has been observed. These results demonstrate the potential of BNNSs as nano-fillers in preparing epoxy nanocomposites with better thermal management and energy storage capacity.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142409354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conjugated electrospinning toward a polycaprolactone scaffold simultaneously containing micro-/nano- fibers for potential biomedical application","authors":"Qi Meng,&nbsp;Hongxing Xu,&nbsp;Yiran Li,&nbsp;Fei Liu,&nbsp;Huarong Shao,&nbsp;Peixue Ling,&nbsp;Shaohua Wu","doi":"10.1007/s10965-024-04152-8","DOIUrl":"10.1007/s10965-024-04152-8","url":null,"abstract":"<div><p>The use of electrospun nanofibers to create a supportive scaffold for cell growth and tissue development has attracted intensive interest in the field of tissue engineering. In this study, a conjugated electrospinning system was designed and employed to fabricate a series of different polycaprolactone (PCL) scaffolds simultaneously containing both of microfibers and nanofibers. SEM images conformed the successful formation of micro-/nano- fibers in one scaffold by adjusting the polymeric concentrations. The PCL concentration was found to have dramatic effects on the diameter of as-generated fibers, and the mean diameter and crystallinity of electrospun PCL fibers decreased with the decreasing of PCL concentration, resulting in much lower mechanical properties. Compared with the pure PCL microfiber-constructed scaffold, the PCL micro-/nano- fiber scaffolds exhibited obviously decreased mean pore size, increased porosity. Interestingly, the PCL micro-/nano- fiber scaffolds were found to exhibit significantly increased Young’s modulus and ultimate stress than both of PCL nanofiber scaffold and PCL microfiber scaffold. In vitro cell characterization results indicated that the introduction of nanoscale fibers significantly enhanced cell adhesion, and proliferation of PCL micro-/nano- fiber scaffolds. Moreover, this enhancement became more pronounced as the average diameter of the nanoscale fibers decreased. Overall, our present study provides an effective strategy for generating PCL micro-/nano- fiber scaffolds with more appropriate structure and properties, which show great potential for tissue engineering application.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polymersomes based on a fumaric copolymer as a novel drug nanocarrier","authors":"Romina Bada,&nbsp;M. Silvina Molinuevo,&nbsp;Julio C. Azcárate,&nbsp;M. Susana Cortizo,&nbsp;Pablo J. Peruzzo","doi":"10.1007/s10965-024-04150-w","DOIUrl":"10.1007/s10965-024-04150-w","url":null,"abstract":"<div><p>There is significant interest in using nanoparticles as new platforms for transporting and releasing drugs with limitations when directly administered into the body. In our research, we developed a platform for encapsulating risedronate using polymersomes obtained by self-assembly of a new triblock amphiphilic copolymer. This copolymer is based on polyethylene glycol (PEG) as a hydrophilic block and a statistical copolymer of vinyl benzoate (VBz) and diisopropyl fumarate (DIPF) as a hydrophobic block. The amphiphilic copolymer, synthesized by reversible addition-fragmentation chain transfer polymerization (RAFT), presented a hydrophilic block fraction mass percentage (f) of 30, which is suitable for forming vesicles through self-assembly. We obtained vesicles of approximately 54 nm using the solvent injection method, with a Z-average hydrodynamic diameter of 163 nm. Compared to the vesicles obtained from a copolymer without DIPF, the nanoparticles were smaller with a narrower size distribution. To assess the potential of these systems as a vehicle for bisphosphonates, we prepared risedronate-loaded polymersomes. The resulting particles had a similar size to their uncharged counterparts, with a risedronate content of 12 ± 2 mg per gram of polymer, as determined by HPLC. Delivery studies demonstrated sustained release of risedronate for up to 10 days. We also evaluated cell viability and cytotoxicity using murine monocyte-macrophage RAW264.7 cells. The empty or risedronate-loaded nanoparticles did not affect cell proliferation, viability, and nitric oxide production at the tested concentrations. However, the particles partially inhibited nitric oxide production induced by lipopolysaccharide (LPS) in macrophages.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and modification of waterborne polyurethane derived from hybrid CO2-based polyols","authors":"Yueqing Chen,&nbsp;Zhenhong Huang,&nbsp;Haijian Chen,&nbsp;Jiaoyan Ai,&nbsp;Lina Song,&nbsp;Baohua Liu","doi":"10.1007/s10965-024-04139-5","DOIUrl":"10.1007/s10965-024-04139-5","url":null,"abstract":"<div><p>Waterborne polyurethanes emulsions (WPU) based on polyethylene carbonate diol (PECD) were synthesized, characterized and modified by polypropylene carbonate diol (PPCD) and organosilicon KH-792. The mechanical, thermal and hydrolysis resistance properties of waterborne polyurethanes were comprehensively investigated. The results show that PECD based WPU has very excellent mechanical properties. The tensile strength and the elongation at break the PU was up to 73 MPa and 1040%, which was much higher than that reported for similar types of PPCD-based WPU. It was found that water absorption of PECD based WPU can be decreased dramatically, from 40.9% to 21.1%, after 50% PECD was replaced by PPCD, while tensile strength only decreased from 73.0 MPa to 63.4 MPa. The addition of KH-792 has great influence on PECD based WPU, when 1% KH-792 was added, the water absorption rate decreased from 21.1% to 11.88%, the mechanical strength remained at 63.3 MPa, the WPU film remained transparent after soaking in 80 ℃ hot water for 4 h.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing stability of doped semiconductor polymers with cytop protective layers: An examination of electrical property retention","authors":"Haibao Ma,&nbsp;Chen Chen,&nbsp;Baiqiao Yue,&nbsp;Kaiqing Lu,&nbsp;Yue Lin","doi":"10.1007/s10965-024-04140-y","DOIUrl":"10.1007/s10965-024-04140-y","url":null,"abstract":"<div><p>Doping is a critical method for enhancing the electrical properties of semiconducting polymers, with ongoing innovations in dopant molecules and doping techniques. However, introducing dopants can disrupt the conjugated backbone of polymers like poly[(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene)] (PBTTT) and indendithiophene-benzothiadiazole (IDTBT), accelerating the degradation of electronic properties, particularly under air exposure. Cytop, as a cross-linked fluorine-rich polymer material, can form amorphous, smooth hydrophobic surfaces that are isolated from air. However, there is a lack of research on Cytop to inhibit the degradation of electrical properties of polymers in air. This study employed ion-exchange and immersion doping techniques on these polymers and explored the protective effects of the crosslinked polymer Cytop as a barrier layer. We measured the electrical properties of doped films both with and without the Cytop layer under various conditions to determine its impact on the polymers' stability. The findings demonstrate that Cytop significantly enhances the films' stability, offering insights into the long-term performance and reliability of doped semiconducting polymers.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"31 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}