Journal of Polymer Science最新文献

{"title":"Effect of Resin Viscosity on Cell Nucleation and Growth","authors":"Zhangqin Mu,&nbsp;Jinfu Xing,&nbsp;Zipeng Wei,&nbsp;Longna Wu,&nbsp;Jie Lei,&nbsp;Xiaodie Zhang,&nbsp;Xiangbu Zeng,&nbsp;Li He,&nbsp;Tuanhui Jiang","doi":"10.1002/pol.20250093","DOIUrl":"https://doi.org/10.1002/pol.20250093","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, resins with different viscosities were prepared by melt blending in an extruder and chemically foamed using an injection molding machine. The nucleation and growth process of the cell was monitored using visual equipment, and the results were analyzed and fitted. The experimental results showed that as the resin viscosity increased, the cell density gradually decreased while the average cell size increased. Higher resin viscosity hindered the diffusion of gas, raising the cell nucleation energy barrier. Furthermore, it delayed the appearance time of cells, reducing a slower formation and growth of cells, leading to uneven cell distribution and a tendency for larger cells to form. In contrast, lower resin viscosity reduced the resistance to nucleation, promoting the formation of more cells at a faster rate and enhancing the growth rate of the cells. The <i>N-t</i> and <i>D-t</i> curves of resins with different viscosities exhibited a “half S” shape. Cells formed and grew rapidly in the early stages of foaming, but both nucleation and growth rates slowed in the later stages, eventually stabilizing.</p>\u0000 </div>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 10","pages":"2209-2221"},"PeriodicalIF":3.9,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Confined Crystallization and Hydrolytic Degradation Behavior of Dual-Crystalline Core–Sheath Fibers Comprising Immiscible Polymers","authors":"Yi-Hsin Tsai,&nbsp;Chieh-Tsung Lo","doi":"10.1002/pol.20250039","DOIUrl":"https://doi.org/10.1002/pol.20250039","url":null,"abstract":"<div>\u0000 \u0000 <p>This study investigated the thermal and crystallization behaviors of electrospun coaxial fibers comprising immiscible poly(butylene succinate) (PBS) and poly(L-lactide) (PLLA) in the core and sheath, respectively. The PBS and PLLA in the as-electrospun fibers were crystalline and noncrystalline, respectively. Thermal treatment resulted in noticeable crystal development for both PBS and PLLA. The confinement of PBS and PLLA chains in the fibers hindered the development of crystalline lamellae, which resulted in the melting points of PBS or PLLA in the fibers being lower than those in bulk PBS or PLLA. Because of the immiscibility of PBS and PLLA, the PBS and PLLA crystallizations were barely affected by each other. During solvent evaporation in electrospinning, rapid relaxation of PBS chains occurred, which caused PBS crystals to be randomly oriented. By contrast, PLLA chains remained stretched and aligned parallel to the fiber axis. Subsequent crystal development resulted in the unidirectional orientation of PLLA crystals. When PLLA and PBS were prepared with a core–sheath structure, their hydrolysis was considerably enhanced. This finding was attributed to the presence of vulnerable PBS-PLLA interfaces. Thermal treatment increased the crystallinity of PBS and PLLA, resulting in a reduction in their hydrolytic degradation.</p>\u0000 </div>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 10","pages":"2187-2198"},"PeriodicalIF":3.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controlling Doping Concentration of Metal Nanoparticles for Enhanced Performance in NFA-Based Organic Solar Cell","authors":"Solomon Ashagre,&nbsp;Abiodun K. Ogundele,&nbsp;Jude N. Ike,&nbsp;Ncedo Jili,&nbsp;Giuseppe Pellicane,&nbsp;Ke Zhou,&nbsp;Wei Ma,&nbsp;Genene Tessema Mola","doi":"10.1002/pol.20250009","DOIUrl":"https://doi.org/10.1002/pol.20250009","url":null,"abstract":"<p>Nanostructured metals have been employed as an important ingredient to enhance performance in photonic devices. It has attracted special interest in thin-film organic solar cells (TFOSCs) as a mechanism to improve photon capture using thin solar absorber. Potassium sulphide doped with silver (K₂S/Ag) was synthesized with the view to have core shell like structures nanoparticle (NP). The particles were then incorporated into solar absorber layer of TFOSCs at different concentrations. Nonfullerene acceptor (NFA)-based solar cells were fabricated, in an inverted device structure, using an active layer composed of donor polymer poly-(4,8-bis(5-(2-ethylhexyl) thiophene-2-yl)benzo[1,2-b; 4,5-<i>b</i>′]-dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluoro-thieno [3,4,b]-thiophene-)-2-carboxylate-2-6-diyl) (PTB7-Th), and nonfullerene (NFA), 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(5-hexyl-thienyl)-dithieno[2,3-d:2′,3′-<i>d</i>′]-<i>s</i>-indaceno[1,2-b:5,6-<i>b</i>′]dithiophene (ITIC-Th). This study reveals the importance of the optimal percolation threshold for efficient charge transport in NFA-based TFOSC. The highest performance was achieved at 1% concentration with a PCE as high as 10.51%, <span></span><math>\u0000 \u0000 <semantics>\u0000 \u0000 <mrow>\u0000 \u0000 <msub>\u0000 \u0000 <mi>J</mi>\u0000 \u0000 <mi>sc</mi>\u0000 </msub>\u0000 </mrow>\u0000 </semantics>\u0000 </math> of 23.74 mA/cm², and FF of 58.86% compared to the reference cell. Such results indicate that the measured electrical and optical properties of the K₂S/Ag metal NPs doped polymer films demonstrated augmented characteristics for photon energy harvesting. The study highlights the importance controlling concentrations as it is evident from device performances.</p>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 10","pages":"2199-2208"},"PeriodicalIF":3.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20250009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Substituent Effects in Monoacylphosphine Oxide Photoinitiators: Efficiency and Performance","authors":"David Bassenheim,&nbsp;Konstantin Knaipp,&nbsp;Max Schmallegger,&nbsp;Georg Gescheidt,&nbsp;Kai Rist,&nbsp;Norbert Moszner,&nbsp;Yohann Catel,&nbsp;Robert Liska,&nbsp;Patrick Knaack","doi":"10.1002/pol.20250212","DOIUrl":"https://doi.org/10.1002/pol.20250212","url":null,"abstract":"<p>Photoinitiators are crucial components in the polymerization processes of lightcurable materials, with-TPO (diphenyl(2,4,6-trimethylbenzoyl)phosphinoxide) being a widely used example. Given the limited number of alternative photoinitiators suitable for the wavelength range in which TPO is employed, this study will investigate the potential of new variants of monoacylphosphine oxide (MAPO) photoinitiators. For this purpose, a series of structures were synthesized in which the phosphorus was modified with different substituents. Subsequently, these structures were analyzed with regard to their absorptive behavior and reactivity. Three derivatives, featuring different alkyl substituents, were selected for detailed investigation. In this detailed study, the addition of emerging phosphorus radicals to double bonds and quantum yields were also considered. It was demonstrated that introducing sterically demanding <i>tert</i>-butyl groups in 2,4,6-trimethylbenzoyl-phenyl(tert-butyl)phosphine oxide (<b>2</b>) and 2,4,6-trimethylbenzoyl-di-tert-butylphosphine oxide (<b>3</b>) results in absorptions shifted to longer wavelengths. Additionally, using 2,4,6-trimethylbenzoyl-cyclohexylphenylphosphine oxide (<b>1</b>), it was shown that replacing the phenyl ring of TPO with a cyclohexyl ring does not significantly alter the absorption behavior, but that alkyl substituents reduce the reactivity of the corresponding P-centered radicals.</p>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 10","pages":"2167-2173"},"PeriodicalIF":3.9,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20250212","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Load-Induced Shear Band Formation in Microscale Epoxy Materials","authors":"Janina Mittelhaus,&nbsp;Julian Konrad,&nbsp;Julius Jacobs,&nbsp;Phil Röttger,&nbsp;Robert Meißner,&nbsp;Bodo Fiedler","doi":"10.1002/pol.20241162","DOIUrl":"https://doi.org/10.1002/pol.20241162","url":null,"abstract":"<p>Thermosetting polymer thin films exhibit distinct mechanical behaviors at the microscopic scale compared to bulk materials. Experimental results reveal significant necking and unexpected shear band formation under tensile load. This study investigates the mechanisms underlying shear band formation in epoxy resin systems composed of bisphenol-diglycidyl-ether and diamines. Mechanical testing methods, including creep, relaxation, and cyclic testing, as well as ex situ and in situ high-resolution infrared (IR) spectroscopy, are used synergistically with quantum mechanical calculations to elucidate the underlying molecular mechanisms. Additionally, molecular dynamics (MD) simulations on a nanoscale model explored the (visco-)plastic behavior and network strain in epoxies. Our findings reveal a strong correlation between shear band formation and shifts in IR spectra, specifically the redshift of <i>para</i>-phenylene and the blueshift of out-of-plane vibrations of aromatic moieties. These shifts are attributed to load-induced aromatic stretching in the polymer backbone. The robust agreement between experimental data and simulation results supports these observations at both the atomic and nanoscale. These insights enhance the understanding of epoxy resin mechanics, potentially informing the design of advanced composite materials.</p>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 10","pages":"2174-2186"},"PeriodicalIF":3.9,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20241162","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tandem ROMP/Vinyl-Addition Polymerization of Norbornene Catalyzed by a Ru/Ni Heterobimetallic Complex","authors":"Douglas H. N. Santos,&nbsp;Gustavo H. C. Masson,&nbsp;Eliada A. Silva,&nbsp;Rafael J. G. Rubira,&nbsp;Otaciro R. Nascimento,&nbsp;Katia Bernardo-Gusmão,&nbsp;Benedito S. Lima-Neto,&nbsp;Beatriz E. Goi,&nbsp;Valdemiro P. Carvalho-Jr","doi":"10.1002/pol.20241092","DOIUrl":"https://doi.org/10.1002/pol.20241092","url":null,"abstract":"<div>\u0000 \u0000 <p>The new compound (1S,4S)-<i>N</i>-(4-iodophenyl)bicyclo[2.2.1]hept-5-en-2-carboxamide (<b>NBE–amide-I</b>) was synthesized using 4-iodoaniline and 5-norbornene-2-carboxylic acid. <b>NBE–amide-I</b> was then used in an oxidative addition reaction with [Ni(PPh₃)₄] to obtain the new complex [NiI(NBE–amide)(PPh₃)₂] (<b>Ni–NBE</b>). The complexes [Ni(NBE–amide)(PPh₃)(Schiff–cyclohexane)] (mono-Schiff–Ni) and [{RuCl₂(η⁶-<i>p</i>-cymene)}μ{(Schiff-pip)Ni(aryl–NBE)(PPh₃)}] (<b>Ru–Ni–NBE</b>) were synthesized via a one-pot reaction using Ni–NBE, salicylaldehyde, and 4-(aminomethyl)piperidine or [RuCl₂(η⁶-<i>p</i>-cymene)(piperidine-(4-aminomethyl))] (mono-RuPip), respectively, in dichloromethane for 16 h. The <b>mono-Ni–Schiff</b> and <b>Ru–Ni–NBE</b> complexes were fully characterized using FTIR, UV–Vis, ¹H and ³¹P{¹H} NMR, MALDI–TOF, EPR, and cyclic voltammetry. These complexes were then evaluated as precatalysts for the vinyl-addition polymerization of norbornene (NBE), achieving yields of 91% and 71%, respectively, using methylaluminoxane (MAO) as the cocatalyst (Al/[Ni] = 2000). <b>Ru–Ni–NBE</b> was also shown to be active in the ring-opening metathesis polymerization (ROMP) of NBE, achieving yields of up to 50% in the presence of 10 equivalents of (trimethylsilyl)diazomethane (TMSDM) as the carbene source. The one-pot synthesis of a copolymer based on assisted-tandem catalysis, combining ROMP and vinyl-addition polymerization of NBE using <b>Ru–Ni–NBE</b>, was conducted through the sequential addition of TMSDM and MAO under previously optimized conditions. The copolymer was characterized by ¹H NMR, GPC, Raman scattering, and SEM.</p>\u0000 </div>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 9","pages":"2146-2157"},"PeriodicalIF":3.9,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Poly(α-Aminophosphine Chalcogenide) Networks: Synthesis, Characterization, and Application for Metal Sequestration","authors":"Jan-Willem Lamberink-Ilupeju,&nbsp;Sean E. Liboiron,&nbsp;Gabrielle A. Tellier,&nbsp;Paul D. Boyle,&nbsp;James J. Noël,&nbsp;Joe B. Gilroy,&nbsp;Paul J. Ragogna,&nbsp;Johanna M. Blacquiere","doi":"10.1002/pol.20240836","DOIUrl":"https://doi.org/10.1002/pol.20240836","url":null,"abstract":"<p>Quaternary mixtures of primary phosphine, chalcogen, diimine, and triimine were employed in polymerization reactions to give α-aminophosphine chalcogenide polymer networks. Six networks were prepared that differed in the chalcogen (O, S) and the aryl substituents on the imine precursors (Ph, 4-F-C₆H₄, 2-OH-C₆H₄). The swellability of the networks in different solvents was evaluated. Four networks displayed exceptional swelling (2–8 × mass increase) with polar aprotic solvents THF and DCM. A mono(α-aminophosphine) oxide molecule was prepared as a molecular model of the parent network, and it was successfully coordinated to <span></span><math>\u0000 \u0000 <semantics>\u0000 \u0000 <mrow>\u0000 \u0000 <msubsup>\u0000 \u0000 <mi>UO</mi>\u0000 \u0000 <mn>2</mn>\u0000 \u0000 <mrow>\u0000 \u0000 <mn>2</mn>\u0000 \u0000 <mo>+</mo>\u0000 </mrow>\u0000 </msubsup>\u0000 </mrow>\u0000 </semantics>\u0000 </math> via monodentate binding through the oxide. The parent phosphine oxide network <b>6O</b> effectively sequestered <span></span><math>\u0000 \u0000 <semantics>\u0000 \u0000 <mrow>\u0000 \u0000 <msubsup>\u0000 \u0000 <mi>UO</mi>\u0000 \u0000 <mn>2</mn>\u0000 \u0000 <mrow>\u0000 \u0000 <mn>2</mn>\u0000 \u0000 <mo>+</mo>\u0000 </mrow>\u0000 </msubsup>\u0000 </mrow>\u0000 </semantics>\u0000 </math> and Fe³⁺ ions from THF solutions.</p>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 9","pages":"2140-2145"},"PeriodicalIF":3.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20240836","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of Gelatin-Based Conductive Microneedles Utilizing a Hydrogen Bonding Dissociator","authors":"Yi Wang,&nbsp;Jiayi Chen,&nbsp;Bin Wang,&nbsp;Hao Wang","doi":"10.1002/pol.20241132","DOIUrl":"https://doi.org/10.1002/pol.20241132","url":null,"abstract":"<div>\u0000 \u0000 <p>Microneedles (MNs) are widely utilized in percutaneous drug delivery systems and represent a crucial approach for drug or vaccine administration. The conductive MNs further enhance the controllability and functionality of these devices, thereby expanding their potential biomedical applications. Given its high biocompatibility and degradability, gelatin emerges as an ideal material for fabricating MNs. However, owing to its inherent hydrogen bonding, gelatin solutions exhibit high viscosity and tend to solidify at room temperature, thus limiting their processability in the preparation of gelatin MNs. In this study, a novel approach was proposed to enhance the fluidity of the gelatin solution and reduce its solidification temperature by adding citric acid as a hydrogen bonding dissociator, thereby facilitating its use in MN fabrication. Furthermore, citric acid functioned not only as a hydrogen bonding dissociator but also as a dopant in the 3,4-ethylenedioxythiophene (EDOT) polymerization process, demonstrating dual functionality and effectively yielding gelatin/poly 3,4-ethylenedioxythiophene (PEDOT) MNs. This research presents an innovative strategy for developing gelatin-based MNs and advances their potential applications in intelligent medical fields.</p>\u0000 </div>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 9","pages":"2131-2139"},"PeriodicalIF":3.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluorene-Arylamine Copolymers: Separable Control of Hole Transport and Light Emission Through Composition and Conformation","authors":"Nikol T. Lambeva,&nbsp;Saurav Limbu,&nbsp;Ji-Seon Kim,&nbsp;Donal D. C. Bradley","doi":"10.1002/pol.20250063","DOIUrl":"https://doi.org/10.1002/pol.20250063","url":null,"abstract":"<p>Copolymerization with arylamine initially reduces the mobility of the fluorene homopolymer due to trapping but increases with higher arylamine content, demonstrating that mobility in these copolymers is governed by chemical composition. While fluorene <i>β</i>-phase conformation plays a minor role in transport, it strongly influences emission. This work highlights the independent control of charge transport and emission, enabling multifunctional copolymer design.\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 9","pages":"2113-2121"},"PeriodicalIF":3.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20250063","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Characterization of a Colorless Polyimide Membrane With a Low Dielectric Constant","authors":"Muke Zhang,&nbsp;Yafei Yu,&nbsp;Yang Liu,&nbsp;Liang Chen,&nbsp;Qin Chen,&nbsp;Jinchao Li,&nbsp;Yaping Zhang","doi":"10.1002/pol.20241207","DOIUrl":"https://doi.org/10.1002/pol.20241207","url":null,"abstract":"<div>\u0000 \u0000 <p>Recently, colorless polyimide (CPI) substrates with excellent optical properties, a suitable thermal stability, and a low dielectric constant have become a key factor in the development of wearable and portable flexible electronic devices. A series of branched CPI films has been successfully prepared here by using a self-made triamine (1,3,5-triple (2-trifluoromethyl-4-aminobenzyl) benzene [TFAPOB]). By adjusting the ratio of the cyclopentanone bis-spironorbornane tetracarboxylic dianhydride (CPODA) monomer and the 4,4-(hexafluoroisopropyl)-diphthalic anhydride (6FDA) monomer, an optimal film (CBPI-10) with the highest content of CPODA was obtained. This film could achieve the highest transmittance of 90% at 550 nm and the highest glass transition temperature of 311°C. This result could be explained by the fact that CBPI-10 contained the least amount of trifluoromethyl side groups and the largest amount of alicyclic units, which resulted in the generation of the minimum free volume fraction (according to molecular dynamics simulations) and the disruption of the conjugation effect between the benzene rings. Additionally, it is worth mentioning that the highest dielectric constant of these films was only 2.17, which was significantly higher than those of traditional CPI polymers (2.61–2.72). Consequently, the present study has focused on developing a novel manufacturing scheme for branched CPIs, which is of guidance importance for the design of colorless polymers and the advancement of flexible display technology.</p>\u0000 </div>","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"63 9","pages":"2102-2112"},"PeriodicalIF":3.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}