Macromolecular Chemistry and Physics最新文献_第9页

Stable Alkyne-Bridged Conjugated Polymer Nanoparticles With a High NIR-II Photothermal Conversion Efficiency of 71% for Effective Photothermal Tumor Therapy 具有高NIR-II光热转换效率71%的稳定的烷基桥联共轭聚合物纳米颗粒用于有效的光热肿瘤治疗

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-18 DOI: 10.1002/macp.202400300

Jing Zhai, Yijian Gao, Yujie Ma, Xiliang Li, Yu Wang, Ning Li, Jie Zhang, Zihan Su, Yuliang Yang, Xiandie Qian, Qi Zhao, Shengliang Li

{"title":"Stable Alkyne-Bridged Conjugated Polymer Nanoparticles With a High NIR-II Photothermal Conversion Efficiency of 71% for Effective Photothermal Tumor Therapy","authors":"Jing Zhai, Yijian Gao, Yujie Ma, Xiliang Li, Yu Wang, Ning Li, Jie Zhang, Zihan Su, Yuliang Yang, Xiandie Qian, Qi Zhao, Shengliang Li","doi":"10.1002/macp.202400300","DOIUrl":"https://doi.org/10.1002/macp.202400300","url":null,"abstract":"Organic photothermal materials (PTMs) in the near-infrared (NIR) range (1000–1700 nm) are more favorable for photothermal therapy (PTT) therapeutic applications because of their greater depth of tissue penetration and better biosafety. However, the photothermal conversion efficiency (PCE) of the few NIR-II-responsive organic PTMs that have been investigated is still slightly low. Here, a stable alkyne-bridged conjugated polymer, BBT-BTE, are explored with a high PCE for tumor ablation within the NIR-II window. The BBT-BTE synthesized by the Stille coupling reaction has strong NIR-II absorption, and their nanoparticles (NPs) achieved a 71% PCE under 1064 nm laser excitation, with good photothermal stability. BBT-BTE NPs are shown to be effective in completely ablating tumors without any recurrence in both in vitro and in vivo experiments. Additionally, the biosafety of these NPs is further proven by biochemical analysis and tissue biopsy. This study developed a high-performance NIR-II PTM and offered practical and feasible insights into the design of efficient photothermal materials specifically for the NIR-II window.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 24","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868856","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}

引用次数: 0

Electrochemical Exfoliation of Graphene and Formation of its Copolyamide 6/66 Nanocomposites by Wet Phase Inversion and Injection Molding

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-18 DOI: 10.1002/macp.202400320

Daniel Ehjeij, Jordan Kopping, Claus Gabriel, Josef R. Wünsch, Hans-Jörg Himmel, Rasmus R. Schröder, Manfred Wilhelm, Jan Freudenberg, Uwe H. F. Bunz, Klaus Müllen

{"title":"Electrochemical Exfoliation of Graphene and Formation of its Copolyamide 6/66 Nanocomposites by Wet Phase Inversion and Injection Molding","authors":"Daniel Ehjeij, Jordan Kopping, Claus Gabriel, Josef R. Wünsch, Hans-Jörg Himmel, Rasmus R. Schröder, Manfred Wilhelm, Jan Freudenberg, Uwe H. F. Bunz, Klaus Müllen","doi":"10.1002/macp.202400320","DOIUrl":"https://doi.org/10.1002/macp.202400320","url":null,"abstract":"Electrochemically exfoliated graphene (EEG) is compounded with copolyamide 6/66 (PA6/66) to investigate the influence of the carbonaceous filler material on the thermal, rheological, and mechanical properties of the composite. Toward that end, the environmentally friendly electrochemical exfoliation in aqueous solution is further developed to furnish graphene in large quantities. Separating the exfoliation process from the incorporation into the polymer matrix by wet phase inversion (WPI) allowed in-depth characterization of the EEG by scanning electron microscopy (SEM), atomic force microscopy (AFM), and Raman spectroscopy. The crystallinity of copolyamide 6/66-EEG is significantly changed, as revealed by differential scanning calorimetry (DSC). Likewise, the new composite materials exhibit different flow properties, as well as increased mechanical reinforcement with additive concentration. This is proven by dynamic shear rheology and three-point stress tests compared to the neat polymer.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400320","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143116565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Ta–TiO2 Nanoparticles in Anion Exchange Membranes: Improved Hydroxide Ion Conductivity and Mechanical Strength for Alkaline Water Electrolysis Cells

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-18 DOI: 10.1002/macp.202400226

Ahmed Mohamed Ahmed Mahmoud, Kenji Miyatake, Kaito Tsujii, Katsuyoshi Kakinuma, Fanghua Liu, Vikrant Yadav, Fang Xian, Lin Guo, Chun Yik Wong, Toshio Iwataki, Makoto Uchida

{"title":"Effect of Ta–TiO2 Nanoparticles in Anion Exchange Membranes: Improved Hydroxide Ion Conductivity and Mechanical Strength for Alkaline Water Electrolysis Cells","authors":"Ahmed Mohamed Ahmed Mahmoud, Kenji Miyatake, Kaito Tsujii, Katsuyoshi Kakinuma, Fanghua Liu, Vikrant Yadav, Fang Xian, Lin Guo, Chun Yik Wong, Toshio Iwataki, Makoto Uchida","doi":"10.1002/macp.202400226","DOIUrl":"https://doi.org/10.1002/macp.202400226","url":null,"abstract":"To improve the properties of quaternized QPAF-4 copolymers as anion exchange membranes, compositing with hydrophilic Ta–TiO2 particles are investigated. Flexible QPAF-4/Ta–TiO2 composite membranes are obtained using solution-casting and die coating methods. Cross-sectional scanning electron microscopy reveals that the die coating method produces a more homogenous and uniform distribution of Ta–TiO2 particles in the composite membranes than the solution-casting method. The Ta-TiO2 particles promotes the suppression of water absorbability and dimensional swelling of the composite membranes which is more pronounced in the die coated membranes. The Ta–TiO2 increase hydroxide ion conductivity to 116.9 mS cm−1 at 80 °C for the die-coated membrane, surpassing that of the pristine QPAF-4 membrane (92 mS cm−1). Ta–TiO2 with the composite membranes survive in 4 m KOH at 80 °C for 1000 h, maintaining 96–112 mS cm−1 (88–99% remaining) of initial conductivity. All composite membranes exhibit higher mechanical robustness (elongation of >200%), with the die-coated composite membranes. The optimized die coated composite membrane is fabricated in an alkaline water electrolysis cell achieving 1.63 V at 1.0 A cm−2 (75.5% efficiency).","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400226","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal-Free, Light-Catalyzed ATRP For the Synthesis of Functional PVDF-Based Block Copolymers and Their Characterization 无金属、光催化 ATRP 用于合成功能性 PVDF 基嵌段共聚物及其表征

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-16 DOI: 10.1002/macp.202400251

Aldo Altomare, Rouguy Sognane, Alice Fiorito, Katja Loos

{"title":"Metal-Free, Light-Catalyzed ATRP For the Synthesis of Functional PVDF-Based Block Copolymers and Their Characterization","authors":"Aldo Altomare, Rouguy Sognane, Alice Fiorito, Katja Loos","doi":"10.1002/macp.202400251","DOIUrl":"https://doi.org/10.1002/macp.202400251","url":null,"abstract":"The synthesis and characterization of poly(vinylidene fluoride) (PVDF)-based block copolymers using a metal-free light-catalyzed atom transfer radical polymerization (ATRP) approach are described. A PVDF macroinitiator with C─Br bonds at both ends of the chain is synthesized, and an organic photoredox catalyst (OPRC) is used to control the process. The metal-free process expands the possibilities for the synthesis and application of PVDF-based block copolymers, as it allows the use of monomers that is previously incompatible with classical ATRP due to their interaction with metal catalysts. The synthesized block copolymers are characterized structurally and thermally as powder materials and in thin films. Fourier-transform infrared spectroscopy (FT-IR) analysis revealed that the crystalline phase of PVDF changes when thin films are formed. Specifically, the disappearance of the FT-IR peaks related to the gamma phase and the presence of characteristic peaks related to the alpha and beta phases indicate that film formation rearranged the PVDF chains, leading to changes in their crystalline phases. These PVDF-based block copolymers have unique properties, including high thermal stability, chemical resistance, and piezoelectricity, making them potential candidates for use in various fields, such as biomedical engineering, energy storage, and electronic devices.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 23","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400251","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Precision Design of Sequence-Defined Polyurethanes: Exploring Controlled Folding Through Computational Design 序列定义聚氨酯的精密设计：通过计算设计探索控制折叠

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-15 DOI: 10.1002/macp.202400223

Svetlana Samokhvalova, Jean-François Lutz, Ivan Coluzza

{"title":"Precision Design of Sequence-Defined Polyurethanes: Exploring Controlled Folding Through Computational Design","authors":"Svetlana Samokhvalova, Jean-François Lutz, Ivan Coluzza","doi":"10.1002/macp.202400223","DOIUrl":"https://doi.org/10.1002/macp.202400223","url":null,"abstract":"This study presents the exploration of sequence-defined polyurethanes (PUs) as a new class of heteropolymers capable of precise conformational control. Utilizing molecular dynamics simulations, the folding behavior of polyurethane chains is investigated of varying lengths (11, 20, and 50 monomers) in both vacuum and aqueous environments. The simulations reveal that the heterogeneous chains systematically refold to approach the designed target structures better than non-designed chains or chains with artificially disrupted hydrogen-bond networks. The subsequent synthesis of an optimized 11-mer sequence (P1) is achieved through solid-phase chemistry, with thorough characterization via NMR, MS, and SEC confirming the accuracy of the predicted sequence and its controlled chain length. Solubility tests showed favorable results across multiple solvents, highlighting the versatility of the designed polymer. This research underscores the potential of sequence-defined polyurethanes to emulate the structural and functional attributes of biological macromolecules, opening new pathways for their application in catalysis, drug delivery, and advanced material design. The findings illustrate a promising direction for the development of synthetic polymers with tailored properties, emphasizing the transformative impact of sequence control in polymer chemistry.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 23","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868589","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}

引用次数: 0

Transparent Photochromic Coatings for Smart Windows and Information Storage 用于智能窗口和信息存储的透明光致变色涂层

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-15 DOI: 10.1002/macp.202400259

Weining Liu, Yuting Tian, Wanxiong Yong, Tuodong Xiong, Guodong Fu

{"title":"Transparent Photochromic Coatings for Smart Windows and Information Storage","authors":"Weining Liu, Yuting Tian, Wanxiong Yong, Tuodong Xiong, Guodong Fu","doi":"10.1002/macp.202400259","DOIUrl":"https://doi.org/10.1002/macp.202400259","url":null,"abstract":"Organic–inorganic composite photochromic coatings receive significant attention in energy utilization and conservation due to their easy application and rapid photoresponse. However, their high sensitivity to moisture limits practical applications. This study fabricates organic–inorganic composite functional coatings using a simple one-pot method, producing materials with excellent photoresponsive, water resistance, and thermal insulation. Unmodified phosphotungstic acid serves as the inorganic photochromic filler, while methacrylate derivatives act as the polymer matrix, resulting in coatings with high initial transparency (over 85%). After 5 min of UV exposure, the samples shift to nearly non-transmittable states in the visible range and maintain color depth through 14 coloring-erasing cycles. Unlike polyvinylpyrrolidone substrates, which absorb moisture and soften quickly, this coating has a static water contact angle of up to 91.7°, showing excellent water resistance. Additionally, the composite material provides effective heat insulation in simulated chamber experiments, lowering the temperature by 15 °C compared to untreated chambers. In summary, this composite coating, with its excellent thermal insulation, rapid light responsiveness, stable cycling performance, and outstanding waterproof capabilities, proves highly suitable for applications such as smart windows, information storage, and building energy efficiency.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 24","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868636","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}

引用次数: 0

Enhancement of Moisture-Resistant Performance of Epoxy Resins via Introduction of Hydrophobic and Flexible Chains

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-14 DOI: 10.1002/macp.202400349

Binglian Zhu, Jun Yang, Chongqing An, Yuhuan Nie, Lu Li, Qixuan Hao, Qibin Chen

{"title":"Enhancement of Moisture-Resistant Performance of Epoxy Resins via Introduction of Hydrophobic and Flexible Chains","authors":"Binglian Zhu, Jun Yang, Chongqing An, Yuhuan Nie, Lu Li, Qixuan Hao, Qibin Chen","doi":"10.1002/macp.202400349","DOIUrl":"https://doi.org/10.1002/macp.202400349","url":null,"abstract":"The introduction of long and flexible polyether chains in epoxy resins is an effective method to improve their toughness. However, using the hydrophilicity/hydrophobicity of polyether chains to tune their moisture resistance has been overlooked currently. In this work, two types of polyether-based diglycidyl ethers with hydrophilic poly(oxyethylene) (DGEPOE) and relatively hydrophobic poly(oxybutylene) segments (DGEPOB) are synthesized and then binary-cured with commercial diglycidyl ether of bisphenol A (DGEBA), respectively, yielding the corresponding DGEPOE:DGEBA-m:ns and DGEPOB:DGEBA-m:ns based on various ratios. For comparison, pure DGEPOEr, DGEPOBr, and DGEBAr resins are also prepared. Results show that the equilibrium water uptake of DGEPOB:DGEBA-m:ns is at least less than one-fifth of that of DGEPOE:DGEBA-m:ns; meanwhile, the diffusion coefficients of water molecules in DGEPOB:DGEBA-m:ns are also 1–2 orders of magnitude lower than those in DGEPOE:DGEBA-m:ns, demonstrating that the incorporation of hydrophobic POB chains can significantly reduce the hygroscopicity of resins. Moreover, DGEPOB:DGEBA-m:ns not only exhibit superior flexibility and ductility relative to pure DGEBAr, but display exceptional strength and toughness in comparison with pure DGEPOBr. These findings suggest that tuning the hydrophilicity/hydrophobicity of building units of epoxy monomers offers a promising strategy for developing high-performance epoxy materials, especially suitable for humid environments.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115195","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}

引用次数: 0

Toward In Vitro Vascular Wall Models: Digital Light Processing of Acrylate-Endcapped Urethane-Based Polymers into Tubular Constructs 体外血管壁模型：丙烯酸酯末端聚氨酯基聚合物成管状结构的数字光处理

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-10 DOI: 10.1002/macp.202400277

Nele Pien, Ianina Pokholenko, Nicolas Deroose, Charlotte Perneel, Rafaelle Vinturelle, Marguerite Meeremans, Diego Mantovani, Sandra Van Vlierberghe, Catharina De Schauwer

{"title":"Toward In Vitro Vascular Wall Models: Digital Light Processing of Acrylate-Endcapped Urethane-Based Polymers into Tubular Constructs","authors":"Nele Pien, Ianina Pokholenko, Nicolas Deroose, Charlotte Perneel, Rafaelle Vinturelle, Marguerite Meeremans, Diego Mantovani, Sandra Van Vlierberghe, Catharina De Schauwer","doi":"10.1002/macp.202400277","DOIUrl":"https://doi.org/10.1002/macp.202400277","url":null,"abstract":"Digital light processing (DLP) is emerging as a powerful tool for fabricating tissue engineering (TE) scaffolds, particularly for vascular TE and the development of representative in vitro vascular wall models. For the latter, biomaterials should mimick the biological and mechanical properties of native blood vessels. To fabricate tubular constructs, the DLP-printing process is optimized by exploiting acrylate-endcapped urethane-based (AUP) polymers as the presence of the acrylate end groups render them suitable for DLP printing and desirable mechanical properties arise from the urethane segments. Four AUP variants are synthesized, exploring polyethylene glycol (PEG) and polypropylene glycol (PPG) backbones with varying acrylate functionalities (di-acrylate versus hexa-acrylate), namely UPEG2, UPEG6, UPPG2, and UPPG6. Tubular constructs with precise dimensions and morphology are fabricated. PPG-based AUP polymers exhibit superior computer-aided design/manufacturing (CAD/CAM) mimicry compared to PEG-based derivatives. Construct characterization reveals tunable mechanical properties, with elastic moduli ranging from 45 to 259 kPa, reaching values of the human blood vessels. In particular, UPPG6 shows a two-fold higher elastic modulus compared to UPPG2. All materials show excellent biocompatibility. Additionally, surface modification with gelatin-methacryloyl (GELMA) significantly enhances the cytocompatibility of UPPG2 scaffolds. This study demonstrates the feasibility of fabricating tubular constructs with tunable properties using DLP and AUP polymers.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 24","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868189","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}

引用次数: 0

Research of 1-Octene C═C Bond Isomerization in High-temperature Solution Copolymerization of Ethylene/1-Octene 乙烯/1-辛烯高温溶液共聚中1-辛烯C = C键异构化研究

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-10 DOI: 10.1002/macp.202400256

Junchen Li, Qishun Guo, Yu Zhang, Chengang Cao, Yating Wang, Tao Jiang

{"title":"Research of 1-Octene C═C Bond Isomerization in High-temperature Solution Copolymerization of Ethylene/1-Octene","authors":"Junchen Li, Qishun Guo, Yu Zhang, Chengang Cao, Yating Wang, Tao Jiang","doi":"10.1002/macp.202400256","DOIUrl":"https://doi.org/10.1002/macp.202400256","url":null,"abstract":"1-Octene has a very high industrial value as one of the linear α-olefins, but the industrial value is severely reduced when its double bond isomerizes to form endo-octene. Thus, in this paper, the effect of reaction temperature, reaction time, type, and concentration of aluminum compounds on the double-bond isomerization reaction of 1-octene and the inhibition of the isomerization by the inhibitor, have been investigated. The mechanism of 1-octene isomerization is studied by combining gas chromatography-mass spectrometry (GC-MS) and density functional theory (DFT) calculations. Modified methylaluminoxanes (MMAO-3A), triethylaluminum (TEA), or triisobutylaluminum (TIBA) could significantly promote 1-octene to undergo double-bond isomerization reactions and the degree of isomerization of 1-octene increased with increasing concentrations of aluminum compounds. In addition, inhibitors such as isooctanol or isooctylamine, can disrupt the structure of the reactive aluminum species and may retard the double bond isomerization reaction of 1-octene. Therefore, reducing the concentration of aluminum compounds in the ethylene/1-octene high-temperature solution copolymerization system and the timely and sufficient use of an inhibitor at the end of the reaction are both effective in eliminating the 1-octene double bond isomerization.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 23","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868176","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}

引用次数: 0

Polyimide Films with Liquid-Crystal-Like Structures: Toward Ultralow Dielectric Loss at High Frequencies

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-10 DOI: 10.1002/macp.202400336

Zhigeng Chen, Yu Chen, Ling Lin, Gongpeng Lin, Zhenxun Huang

{"title":"Polyimide Films with Liquid-Crystal-Like Structures: Toward Ultralow Dielectric Loss at High Frequencies","authors":"Zhigeng Chen, Yu Chen, Ling Lin, Gongpeng Lin, Zhenxun Huang","doi":"10.1002/macp.202400336","DOIUrl":"https://doi.org/10.1002/macp.202400336","url":null,"abstract":"Polyimide films with low dielectric loss (Df) at high frequencies are urgently needed owing to the rapid development of high-frequency communication technologies. Herein, various polyimide films with rigid mesogenic units are prepared to address this issue. Improving molecular flexibility has been found to promote crystallization during thermal imidization and, consequently, the formation of liquid-crystal-like polyimide (LCPI) films. The optimal LCPI film exhibits an ultralow Df value of 0.00178 at 10 GHz owing to the limited intermolecular friction. Furthermore, this LCPI film absorbs significantly less water (0.59%), which endows it with favorable durability of low Df value in a humid environment. The Df value of the LCPI film at 10 GHz is only 0.00288 after 24 h of exposure to 60% relative humidity. In addition, the LCPI film exhibits a glass transition temperature, coefficient of thermal expansion, and tensile strength of 371 °C, 21.8 ppm K−1, and 240 MPa respectively, and is therefore a suitable low-dielectric-material candidate.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114195","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}

引用次数: 0