Chinese Journal of Polymer Science最新文献

{"title":"Low-cost Preparation of High-performance Polyimide Separators: High-value Application of Recycled Polyimide Films","authors":"Ying-Hua Sha,&nbsp;Zi-Hao Huang,&nbsp;Jia-Shu Lin,&nbsp;Yan-Wei He,&nbsp;Chu-Ying Li,&nbsp;Hai-Tao Huang,&nbsp;Si-Wei Liu,&nbsp;Yi Zhang","doi":"10.1007/s10118-026-3730-6","DOIUrl":"10.1007/s10118-026-3730-6","url":null,"abstract":"<div><p>With growing global focus on plastic circular recycling and sustainable development, chemical upcycling is gaining importance. It converts waste plastics into high-value products, avoiding the performance degradation and downcycling associated with conventional physical recycling processes. Polyimide (PI) is a high-performance polymer material, particularly valued in the field of lithium-ion batteries as a separator due to its high-temperature resistance, favorable mechanical strength, and good electrolyte wettability. However, its broader application has been limited by the high cost of its monomers and the energy consumption of its preparation process compared to conventional lithium-ion battery separators such as polyethylene/polypropylene. Here, we propose an effective strategy for the high-value application of recycled polyimide (PMDA/ODA-type) films through chemical catalysis: using lithium hydroxide to catalyze the partial ring-opening of the imide rings in recycled polyimide, transforming the insoluble and infusible recycled polyimide into a soluble poly(amic acid)-polyimide system (PAA-PI). This system is further processed <i>via</i> electrospinning to fabricate polyimide nanofiber membranes, which are applied as separators in lithium-ion batteries. They exhibit similar structural, thermal properties, and mechanical properties to the PI separators prepared by the traditional method, while also possessing good porosity, electrolyte wettability, and electrolyte uptake. Furthermore, batteries prepared using this recovered PI separator (RPI) exhibit excellent high-rate performance (135.55 mAh·g⁻¹ at 5 C current) and long-term cycle stability (118.01 mAh·g⁻¹ after 100 cycles at 0.5 C current, and 87.10 mAh·g⁻¹ after 100 cycles at 2.0 C current), showing no significant difference compared to batteries prepared with conventional PI separators, while outperforming batteries prepared with commercial Celgard 2500 separators, essentially meeting the performance requirements of next-generation lithium-ion batteries. This work presents a strategy for the low-cost production of high-safety polyimide-based separators in lithium-ion batteries, enabling the high-value reuse of polyimide waste and thereby establishing a process consistent with green chemistry and sustainable development.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3387 - 3397"},"PeriodicalIF":4.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098206","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}

{"title":"Spatially Resolved Cavitation within Tensile Stretched Isotactic Polybutene-1 Spherulite","authors":"Cong-Wen Zhao,&nbsp;Shao-Dong Mou,&nbsp;Zhi-Yong Jiang,&nbsp;Yong-Feng Men","doi":"10.1007/s10118-026-3743-1","DOIUrl":"10.1007/s10118-026-3743-1","url":null,"abstract":"<div><p>The precise microstructural origin of cavitation in semicrystalline polymers remains a subject of persistent controversial. Consequently, the exact spatial initiation of voids within a single spherulite remains under debate. Resolving this ambiguity has long been hindered by the spatial resolution limits of the conventional characterization techniques. To overcome this limitation, we employ an integrated approach of <i>in situ</i> synchrotron microfocus X-ray scattering and ultrasmall-angle X-ray scattering to investigate the cavitation behavior within individual isotactic polybutene-1 spherulite during uniaxial stretching. It turns out that early-stage voiding exhibits a distinct spatial sequence. Structural damage preferentially initiates at the spherulitic center, subsequently emerges in the equatorial region, and ultimately propagates to polar regions. By reconstructing the three-dimensional lamellar orientation within the undeformed spherulite, we revealed that lamellae oriented parallel to the stretching direction are extensively distributed across all spherulitic regions. Based on these findings, we propose a micro-mechanical cavitation model. In this framework, parallel lamellae undergo direct mechanical fragmentation under stress, with microvoids nucleating within the interstitial gaps between adjacent crystalline blocks.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3528 - 3541"},"PeriodicalIF":4.6,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149099035","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}

{"title":"Special Topic: Chirality in Polymers","authors":"Feng Wang,&nbsp;Xin-Hua Wan","doi":"10.1007/s10118-026-3831-2","DOIUrl":"10.1007/s10118-026-3831-2","url":null,"abstract":"","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 9","pages":"2809 - 2809"},"PeriodicalIF":4.6,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909491","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}

{"title":"Interface-driven and Functionality-oriented Additive Stabilization Design for Ester-based LiPF6 Electrolytes","authors":"Xiu-Ping Gao,&nbsp;Ben Su,&nbsp;Si-Da Huo,&nbsp;Lei Chai,&nbsp;Wen-Dong Xue","doi":"10.1007/s10118-026-3739-x","DOIUrl":"10.1007/s10118-026-3739-x","url":null,"abstract":"<div><p>Lithium-ion battery liquid electrolytes serve as the “blood” of the battery, undertaking the critical mission of transporting lithium ions between the cathode and anode. Consequently, the market demand for performance continues to escalate. However, lithium-ion batteries still face substantial challenges in terms of specific energy, safety, and cycle life, with the degradation of ester-based electrolytes being particularly prominent. Therefore, research on multifunctional electrolyte additives has become a focal area, offering promising avenues for effectively addressing these challenges. This study systematically analyzed the degradation mechanisms of ester-based lithium hexafluorophosphate (LiPF₆) electrolytes, emphasizing the pivotal role of the inevitably generated hydrogen fluoride and phosphorus pentafluoride (HF and PF₅) in electrolyte breakdown. This elucidates the crucial contribution of mechanism-oriented functional groups in stabilizing electrolytes, scavenging HF/PF₅, modulating solvation structures, and engineering robust solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI). Furthermore, we developed a high-throughput computational workflow utilizing Gaussian 09, Multiwfn, and VMD to rationally design multifunctional additives through synergistic integration of functional groups and density functional theory (DFT)-guided screening. This approach evaluates HF/PF₅ binding energies, frontier orbital energies (HOMO/LUMO) levels (redox activity), chemical hardness, and electrostatic potential interactions. Unlike previous reviews that primarily rely on empirical data summaries, this work innovatively bridges the gap between macroscale electrolyte failure behaviors and the microscale rational design of additives. By establishing a unified framework from HF/PF₅ evolution to DFT-driven multi-functional molecular engineering, our study provides a predictive and systematic design guideline to minimize experimental trial and error, thereby accelerating the development of wide-temperature, high-voltage electrolytes with enhanced cycle life and safety.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3253 - 3278"},"PeriodicalIF":4.6,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098692","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}

{"title":"Robust Intrinsically Stretchable Organic Photodetectors Enabled by High-molecular-weight Conjugated Polymer Fibrils","authors":"He-Bing Nie,&nbsp;Lu Hao,&nbsp;Jing-Chuan Chen,&nbsp;Zhi-Yuan Yang,&nbsp;Xue-Fei Wu,&nbsp;Zhi-Qin Xia,&nbsp;Wan-Cheng Yu,&nbsp;Xue-Chen Jiao,&nbsp;Wen-Kai Zhong,&nbsp;Fei Huang","doi":"10.1007/s10118-026-3746-y","DOIUrl":"10.1007/s10118-026-3746-y","url":null,"abstract":"<div><p>Intrinsically stretchable organic photodetectors (IS-OPDs) are highly attractive for applications such as skin-mounted wearables, soft robotics, and electronic textiles. However, simultaneously achieving mechanical robustness and stable optoelectronic functionality under high strain remains a challenge. Here, we demonstrate that the fibrillar network morphology formed by high-molecular-weight conjugated polymer blends provides an effective pathway to overcome this limitation. The entangled, interconnected polymer fibrils establish a mechanically percolated network that efficiently dissipates strain energy and suppresses crack propagation, enabling a high fracture strain of about 80% and enhanced toughness. The fibrillar network also forms continuous charge transport pathways, resulting in improved carrier mobility and reduced trap density. Therefore, the IS-OPDs exhibit outstanding performance stability under large deformations, maintaining a high detectivity of about 10¹² Jones at strains above 40%, while enabling reliable optical communication and clear imaging capability even at 100% strain. Our study identifies a high-molecular-weight-driven fibrillar morphology as a key structural motif for mechanically robust IS-OPDs.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3297 - 3307"},"PeriodicalIF":4.6,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098697","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}

{"title":"Exchange Kinetics of Reprocessable Vulcanization Networks Regulated by Inverse Vulcanization Copolymers","authors":"Zhou-Liang Wu,&nbsp;Ling-Rui Li,&nbsp;Yu Zhou,&nbsp;Di Yang,&nbsp;Shuang-Quan Liao,&nbsp;Jun-Fei Mei,&nbsp;Ai-Wu Ding,&nbsp;Ming-Chao Luo","doi":"10.1007/s10118-026-3740-4","DOIUrl":"10.1007/s10118-026-3740-4","url":null,"abstract":"<div><p>The reprocessing and recycling of vulcanized rubbers remain challenging because conventional vulcanization networks are irreversible. Here, we designed a modified sulfur crosslinker <i>via</i> inverse vulcanization to regulate the exchange kinetics of vulcanization networks, thereby governing the mechanical recovery behavior of reprocessed rubbers. Copolymers of sulfur and thioctic acid (CSTA), synthesized <i>via</i> inverse vulcanization, were employed to crosslink butadiene-styrene rubber. After vulcanization, thioctic acid (TA) introduces dynamic disulfide bonds into the conventional vulcanization networks, enabling thermally activated network rearrangement while preserving the overall crosslinked structure. Kinetic analysis revealed that increasing the TA content accelerated network exchange and significantly lowered the apparent activation energy for network rearrangements. Correspondingly, the recovery of the mechanical properties after reprocessing improved with increasing TA content. These results establish a clear correlation between vulcanization network exchange kinetics and macroscopic mechanical performance, providing a kinetic basis for the design of reprocessable vulcanization networks and offering a promising route toward recyclable high-performance rubber materials.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3565 - 3573"},"PeriodicalIF":4.6,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098691","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}

{"title":"Spatiotemporal Structure Heterogeneity Evolution during Latex Film Formation Investigated by Operando Single-sided Nuclear Magnetic Resonance Relaxometry","authors":"Xiao-Jie Chen,&nbsp;Ling-Han Shi,&nbsp;Jun Chen,&nbsp;Ling-Xun Qi,&nbsp;Yi-Zhen Yan,&nbsp;Zhong Zeng,&nbsp;Yi-Qun Yang,&nbsp;Zheng-Nan Yang,&nbsp;Jie Sun,&nbsp;Wei Chen","doi":"10.1007/s10118-026-3755-x","DOIUrl":"10.1007/s10118-026-3755-x","url":null,"abstract":"<div><p>Understanding the film formation mechanism of waterborne latex is crucial for developing high-performance, eco-friendly coatings. However, the influence of various enviromental factors, <i>i.e.</i> temperature and wind, on spatiotemporal structure heterogeneity induced during drying complicates the establishment of the structure-process-property of coating. Here, we track a polyacrylate latex film formation using a custom-built single-sided nuclear magnetic resonance (NMR) hyphenated instrument. Two-dimensional correlation spectra reveal highly restricted water dynamics within the latex suspension, evidenced by a decreased self-diffusion coefficient <i>D</i> from 2.00×10⁻⁹ m²/s of pure water to 1.39×10⁻⁹ m²/s in suspension with a plummeted <i>T</i>₁/<i>T</i>₂ of 30, which is about 111 for pure water. For film drying under mild conditon (24 °C without airflow), dense particle packing induces strong capillary forces, generating anomalous fast-diffusion channels (<i>D</i> up to 31.05×10⁻⁹ m²/s) to accelerate water evaporation resulting in homogeneous structure along the thickness direction. Conversely, after introducing airflow, <i>i.e.</i> 35 °C with 10 L/min airflow, the accelerated drying rate (3.72 µm/min) drastically amplifies the spatiotemporal heterogeneity and triggers premature surface skinning. Such skin-core structure traps residual water inside and inhibit further coalescing of latex particles. The uncoalesced bottom layer thicknesses quantitatively predicted by non-destructive single-sided NMR (about 100, 200, and 400 µm), which is well consistent with SEM measurements (93, 240, and 409 µm, respectively). This work provides direct physical insights and theoretical guidance for the formulation and application of waterborne coatings during real service condition.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3574 - 3585"},"PeriodicalIF":4.6,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098693","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}

{"title":"High-strength and Electrically Stable Aramid Nanofibers/Multi-walled Carbon Nanotubes/Polyaniline Hybrid Fibers for Flexible Electromagnetic Absorption Performance","authors":"Xiao-Qi Ni,&nbsp;Xiang-Yang Xu,&nbsp;Yao-Feng Zhu,&nbsp;Hui-Ya Wang","doi":"10.1007/s10118-026-3727-1","DOIUrl":"10.1007/s10118-026-3727-1","url":null,"abstract":"<div><p>The rapid advancement of communication technologies and wearable applications has increased the demand for high-performance flexible electromagnetic wave absorption materials. Conventional conductive fibers are often constrained by their poor wearability, weak interfacial stability, and limited absorption efficiency, which restrict their reliability and practical applicability in dynamic environments. Herein, a flexible and robust electromagnetic-absorbing fiber was successfully fabricated <i>via</i> wet spinning techniques, which integrates multi-walled carbon nanotubes (MWCNTs), polyaniline (PANI), and aramid nanofibers (ANFs). Polymerization of PANI on the MWCNTs surface is employed to optimize impedance matching and enhance interfacial compatibility, while ANFs serve as a continuous structural skeleton, improving the mechanical strength and spinnability. The resulting composite fibers exhibited a tensile strength of (202.0±8.0) MPa and an elongation at break of 13.6%±0.9%, stable electrical conductivity under mechanical deformation, and ultrasonic cleaning. Notably, the fiber architecture enables superior electromagnetic wave absorption, achieving a minimum reflection loss of −62.07 dB and an effective bandwidth of 3.24 GHz compared to the powder counterparts, owing to the extended propagation path and multiple scattering within the aligned fiber network. In addition, the composite fibers demonstrated self-extinguishing behavior during combustion, reflecting their inherent flame-retardant characteristics. This study provides a feasible strategy for developing flexible, high-performance electromagnetic wave (EMW)-absorbing fibers for next-generation protective textile materials.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3555 - 3564"},"PeriodicalIF":4.6,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098951","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}

{"title":"Rod-coil Amphiphilic Block Copolymer Assisting Emulsion Confinement Self-assembly of Hydrophobic Quantum Dot into Robust Bio-imaging Nanoprobe","authors":"Jun-Ni Xie,&nbsp;Xiao-Ling Xu,&nbsp;Huan-Di Qiu,&nbsp;Yuan-Yuan Li,&nbsp;Xiao-Feng Peng,&nbsp;Yu-Fei Wang,&nbsp;Xing-Bao Yang,&nbsp;Xiao-Hong He,&nbsp;Dong-Sheng Wang,&nbsp;Kun Jia","doi":"10.1007/s10118-026-3724-4","DOIUrl":"10.1007/s10118-026-3724-4","url":null,"abstract":"<div><p>Self-assembly of block copolymers (BCP) with quantum dots (QDs) in a three-dimensional confined emulsion system is an effective method for preparing advanced QD/polymer composite particles with diverse morphologies and functionalities. However, the obtained particles normally exhibit sub-micrometer sizes and contain residual toxic surfactants, which hinders their potential application in fluorescent bioimaging. In this study, we designed and synthesized a rod-coil-type amphiphilic block copolymer bearing a rigid hydrophobic poly(arylene ether nitrile) (PEN) block end-capped with a flexible hydrophilic poly(ethylene glycol) (PEG) segment for the first time. Subsequently, the synthesized amphiphilic block copolymer, abbreviated as PENG, was employed as both the macromolecular surfactant and polymeric matrix to encapsulate the green-emitting oleophilic QD <i>via</i> emulsion confinement self-assembly. This process ultimately results in the generation of surfactant-free QD@PENG nanoparticles showing robust fluorescence emission over a wide pH and salt concentration range. Meanwhile, both the fine morphology and fluorescence emission of the QD@PENG nanoparticles were well preserved even after steam sterilization at 121 °C for 2 h, which is attributed to the high-temperature resistance of the rigid PEN segment. Owing to their robust fluorescence, biocompatibility, and nanoscale size (about 100 nm), the optimized QD@PENG nanoparticles exhibited good performance in fluorescent imaging of macrophage cells. The current work proves that the emerging rod-coil amphiphilic block copolymers could serve as a promising matrix for the preparation of reliable bio-imaging probes.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 10","pages":"3375 - 3386"},"PeriodicalIF":4.6,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098856","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}

{"title":"Enhancing Processability of Phenylethynyl-terminated Imide Oligomers and Properties of Cured Polyimides via — CF3 Incorporation","authors":"Xiao-Ying Xing,&nbsp;Xin-Er Liu,&nbsp;Zun-Chu Liu,&nbsp;Chu-Ying Li,&nbsp;Xue-Yi Yu,&nbsp;Ye Zhang,&nbsp;Xin-Zheng Huang,&nbsp;Ruo-Peng Liu,&nbsp;Si-Wei Liu,&nbsp;Yi Zhang","doi":"10.1007/s10118-026-3716-4","DOIUrl":"10.1007/s10118-026-3716-4","url":null,"abstract":"<div><p>Advanced aerospace technologies demand polymer-based wave-transparent materials with low dielectric constant (<i>D</i>_k), low dissipation factor (<i>D</i>_f), and high heat resistance for hypersonic vehicles. Thermosetting polyimides (PIs) from phenylethynyl-terminated imide (PETI) oligomers are promising candidates due to their excellent thermal stability; however, their application is limited by high <i>D</i>_k and <i>D</i>_f at high frequencies and processing difficulties. Here, a series of PETI oligomers were designed and synthesized by polycondensation of 9,9-bis(3,4-dicarboxyphenyl)fluorene dianhydride containing a Cardo structure, and six diamine monomers, respectively. The diamines were divided into three pairs by backbone flexibility, with each pair comprising a non-fluorinated diamine and its trifluoromethyl (—CF₃) substituted analog. The effects of chain segment flexibility and — CF₃ substitution on the processability of the oligomers and the properties of the cured PIs were systematically investigated. Results show that oligomers with — CF₃ groups exhibit enhanced solubility and improved viscosity stability at 270 °C compared to their non-fluorinated counterparts. Moreover, the corresponding cured resins show lower <i>D</i>_k and <i>D</i>_f values while maintaining good thermal stability and mechanical properties. Notably, the BPAF-FA system exhibits favorable properties: an oligomer solubility of 40 wt% in NMP, and a minimum melt viscosity of 5.61 Pa·s; <i>D</i>_k=2.953, <i>D</i>_f=0.0098 (at 50% RH), <i>T</i>_g=403 °C. Mechanistic analysis indicates that these improvements result from the synergistic effects of the intrinsic characteristics of — CF₃ groups (steric hindrance, electron-withdrawing effect, low polarizability, and hydrophobicity) and their role in influencing chain flexibility, symmetry, and molecular packing. These findings provide valuable guidance for the design of high-temperature-resistant, low-dielectric wave-transparent composite materials.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 9","pages":"3002 - 3016"},"PeriodicalIF":4.6,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909477","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}