Macromolecular Chemistry and Physics最新文献_第7页

Fabrication of Cross-Linked Polyimide Hollow Microspheres With Lightweight, Thermal Resistance and Controllable Size 制造轻质、耐热、尺寸可控的交联聚酰亚胺中空微球

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-28 DOI: 10.1002/macp.202400227

Yuntao Fu, Haichao Meng, Fenglin Wang, Huawei Zou, Yinfu Luo, Mei Liang, Peng Xie

{"title":"Fabrication of Cross-Linked Polyimide Hollow Microspheres With Lightweight, Thermal Resistance and Controllable Size","authors":"Yuntao Fu, Haichao Meng, Fenglin Wang, Huawei Zou, Yinfu Luo, Mei Liang, Peng Xie","doi":"10.1002/macp.202400227","DOIUrl":"10.1002/macp.202400227","url":null,"abstract":"Polyimide (PI) hollow microspheres possess lightweight and excellent thermal resistance, which are widely used in microreactors, catalysis, adsorption separation, high-temperature insulation, and so on. In this manuscript, PI hollow microspheres are fabricated by constructing a crosslinked structure combined with gradient heating. The formation of PI hollow microspheres includes gas nucleation, expansion, and imidization. The PI hollow microspheres size is controlled by adjusting polyester ammonium salts size, and microspheres size is distributed in 309–956 µm. PI hollow microspheres have lightweight, excellent heat resistance and carbonization performance, bulk density, initial decomposition temperature, and weight residue at 800 °C is 87.3–178.6 kg m−3, 533.6 °C and 59.8%. The PI hollow microspheres have potential applications in high-temperature resistant and multifunctional composite materials preparation. Moreover, this method is simple, efficient, and highly operable, which can be used for large-scale production of PI hollow microspheres.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 22","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177859","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}

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Eco-Friendly, Recyclable Supramolecular Inks Incorporating Multi-Walled Carbon Nanotubes 含有多壁碳纳米管的环保型可回收超分子油墨

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-26 DOI: 10.1002/macp.202400188

Chunxiao Ding, Meng Bai, Ruirui Liu, Xinyue Zhang, Ning Ma, Alaa S. Abd-El-Aziz

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Aryl‐Ether‐Free Polyaromatics‐Based Alkaline‐Resistant Anion exchange PTFE Composite Membrane 不含芳基醚的聚芳烃基抗碱性阴离子交换聚四氟乙烯复合膜

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-22 DOI: 10.1002/macp.202400215

Rikhil R. Iyer, Karteek Boga, Joseph F. Varga, Huanting Wang, Kei Saito

{"title":"Aryl‐Ether‐Free Polyaromatics‐Based Alkaline‐Resistant Anion exchange PTFE Composite Membrane","authors":"Rikhil R. Iyer, Karteek Boga, Joseph F. Varga, Huanting Wang, Kei Saito","doi":"10.1002/macp.202400215","DOIUrl":"https://doi.org/10.1002/macp.202400215","url":null,"abstract":"Novel aryl‐ether‐free polyaromatics with different‐sized cationic headgroups tethered to the backbone are synthesized via superacid‐catalyzed polycondensations and subsequent Menshutkin quaternization reactions for potential application as anion exchange membranes (AEMs) in electrolysis. Experimentally, the effect of four different heterocycloaliphatic quaternary ammonium cationic headgroups on the AEM properties, such as the hydroxide conductivity, water uptake, swelling ratios and alkaline stability, is fully explored. Thin films are prepared by spin‐coating these AEMs onto porous polytetrafluoroethylene substrates. With a high degree of quaternization, these new aryl‐ether free polyaromatic thin film AEMs achieved high conductivities and good mechanical stability. The highest hydroxide conductivity of 45 mS cm−1 is achieved with excellent alkaline stability and conductivity retention of 96% after 30 days in 1 m KOH at 80 °C. Due to the polytetrafluoroethylene substrates, the swelling ratios and water uptake are relatively small, which ensured the astute dimensional stability of these thin film AEMs. The combined effect of alkaline‐stable cationic headgroups, an aromatic backbone and a robust substrate led to a promising thin‐film AEM.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"40 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223493","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}

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Front Cover: Macromol. Chem. Phys. 16/2024 封面：Macromol.Chem.16/2024

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-20 DOI: 10.1002/macp.202470032

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Masthead: Macromol. Chem. Phys. 16/2024 刊头：Macromol.Chem.16/2024

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-20 DOI: 10.1002/macp.202470033

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Dynamic Mechanical Spectroscopy with Cylindrical Geometry: Application to the Comparison of Various Plasticizers of Thermoplastic Starch 圆柱几何动态机械光谱：应用于热塑性淀粉各种增塑剂的比较

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-20 DOI: 10.1002/macp.202400189

Jonathan Basson, Christian Carrot, Yvan Chalamet, Nathalie Mignard

{"title":"Dynamic Mechanical Spectroscopy with Cylindrical Geometry: Application to the Comparison of Various Plasticizers of Thermoplastic Starch","authors":"Jonathan Basson, Christian Carrot, Yvan Chalamet, Nathalie Mignard","doi":"10.1002/macp.202400189","DOIUrl":"https://doi.org/10.1002/macp.202400189","url":null,"abstract":"Dynamic mechanical spectroscopy is a common analysis for polymers. Rectangular specimens are usually used for measurement in the solid state due to their easy designing. However, in reason of the non-symmetric shape of sample, rectangular specimens do not experience linear stress on their all body, leading to overestimation of shear modulus. Corrections are required to determine the right shear modulus. In this present work, straight shear modulus determination is carried out using specimens with a cylindrical shape. The reliability of the technique is described on a biosourced polymer materials made of thermoplastic starch, plasticized by glycerol, choline chloride/urea mixture (ChCl/U), 1-ethyl-3-methylimidazolium chloride ([EMIM]Cl) and 1-ethyl-3-imidazolium acetate ([EMIM]Ac). The technique is shown to be particularly interesting to avoid any additional shaping of the specimens prior to measurements, that can be detrimental to their properties (evaporation, degradation). A comparison between cylinder and rectangular specimen has also been made to illustrate the interest of cylinder clamping on biosourced polymer material.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 21","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666098","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}

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Proximal Photocleavage: Controlling Polymer Solubility through Pathway Dependent Wavelength-Orthogonal Photoreactions 近端光解：通过路径依赖性波长-不对称光反应控制聚合物溶解度

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-20 DOI: 10.1002/macp.202400216

Nigel D. Kidder-Wolff, Samuel W. Thomas III

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Bimodal Magneto-Luminescent Response of Lanthanide Metallopolymers for Distinguishing of Phosphates in Aqueous Solutions 用于区分水溶液中磷酸盐的镧系金属聚合物的双模磁致发光响应

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-18 DOI: 10.1002/macp.202400253

Alexey P. Dovzhenko, Vadim A. Vasilyev, Timur A. Kornev, Alexander A. Chinarev, Alexey V. Nizovtsev, Rustem R. Zairov, Oleg G. Sinyashin, Asiya R. Mustafina

{"title":"Bimodal Magneto-Luminescent Response of Lanthanide Metallopolymers for Distinguishing of Phosphates in Aqueous Solutions","authors":"Alexey P. Dovzhenko, Vadim A. Vasilyev, Timur A. Kornev, Alexander A. Chinarev, Alexey V. Nizovtsev, Rustem R. Zairov, Oleg G. Sinyashin, Asiya R. Mustafina","doi":"10.1002/macp.202400253","DOIUrl":"10.1002/macp.202400253","url":null,"abstract":"Linear N-substituted polyacrylamides bearing tricarboxylic moieties pendant to the backbone are synthesized, and coordinative binding approach is developed to convert them into Gd3+/Eu3+-metallopolymers. Inner-sphere coordination of the lanthanide ions with the pendant chelating moieties, together with their outer-sphere stabilization by the randomly coiled backbone, are the reasons for peculiar water proton relaxation and luminescence properties of the metallopolymers obtained. Indeed, for Gd3+-metallopolymer, the values of longitudinal and transverse relaxivity (r1 and r2) are 50 and 60 mm−1·s−1, respectively, while for the Eu3+-counterpart, Eu3+-centered luminescence is significantly raised compared to Eu3+ aquaions. Coil-like conformation of the metallopolymer molecules undergoes a swelling at pH values above 5.0 as evidenced by transmission electron microscopy TEM and dynamic light scattering (DLS) data, which is followed by the changes in the Eu3+-centered luminescence and r1(2)-values of Gd3+/Eu3+-metallopolymers. The phosphates additives (adenosine monophosphoric acid (AMP), adenosine diphosphoric acid (ADP), HPO42− and adenosine triphosphoric acid (ATP) induce well detectable changes in both water proton relaxation and luminescence of Gd3+/Eu3+-metallopolymers. The luminescent changes distinguish AMP from the other phosphates, while the changes in water proton relaxation are greater for HPO42− and ATP compared to AMP and ADP. This study explains this by interplay of the effects associated with the formation of ternary phosphate-lanthanide-polymer complexes and stripping of lanthanide ions from the polymer molecules.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 23","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177863","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}

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Orientation of Chitin Nanofibers Dispersed in a Thermoplastic Polymer Matrix Through Dry Thermal Stretching 通过干热拉伸使分散在热塑性聚合物基质中的甲壳素纳米纤维定向

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-18 DOI: 10.1002/macp.202400150

Tetsuya Katsuragawa, Morihiko Yokoi, Ryosuke Kobe, Yoshikuni Teramoto

{"title":"Orientation of Chitin Nanofibers Dispersed in a Thermoplastic Polymer Matrix Through Dry Thermal Stretching","authors":"Tetsuya Katsuragawa, Morihiko Yokoi, Ryosuke Kobe, Yoshikuni Teramoto","doi":"10.1002/macp.202400150","DOIUrl":"10.1002/macp.202400150","url":null,"abstract":"Nanostructures derived from structural polysaccharides, such as cellulose and chitin, are notable for their sustainability, lightweight properties, and superior mechanical attributes. The macroscopic performance of these materials largely depends on the orientation of nanostructures. This study explores the preferential orientation of chitinous nanofibers (NFs) within a thermoplastic polymer matrix (PM) comprising poly(N-vinylpyrrolidone) and glycerol, achieved through dry thermal stretching techniques. Altering the PM composition enables the modulation of the system's glass transition temperature (Tg). Chitin NFs are effectively dispersed within the PM, with their orientation enhanced by stretching at temperatures ≈30 °C above the Tg of the composites, resulting in an elongation at rupture (ε) of 105%. Under similar temperature conditions, composites with chitosan NFs show strong interactions with the PM, hindering the stretching process (ε = 10%). In contrast, composites with acetylated chitin NFs demonstrate increased stretchability (ε = 170%) but have insufficient interactions to stabilize their orientation. These interactions, identified as hydrogen bonds through FTIR, vary significantly based on the functional groups present on the NF surfaces. This variation is supported by DSC and dynamic mechanical analysis. Oriented ChNFs hold potential for bioactive applications.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 20","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223494","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}

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Nanophase Segregation Drives Heterogeneous Dynamics in Amphiphilic PLMA-b-POEGMA Block-Copolymers with Densely Grafted Architecture 纳米相分离驱动具有密集接枝结构的两亲 PLMA-b-POEGMA 嵌段聚合物中的异构动力学

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-08-16 DOI: 10.1002/macp.202400180

Achilleas Pipertzis, Athanasios Skandalis, Stergios Pispas, George Floudas

{"title":"Nanophase Segregation Drives Heterogeneous Dynamics in Amphiphilic PLMA-b-POEGMA Block-Copolymers with Densely Grafted Architecture","authors":"Achilleas Pipertzis, Athanasios Skandalis, Stergios Pispas, George Floudas","doi":"10.1002/macp.202400180","DOIUrl":"10.1002/macp.202400180","url":null,"abstract":"The self-assembly and dynamics of amphiphilic diblock copolymers composed of densely grafted poly(oligo ethylene glycol methacrylate) (POEGMA) and poly(lauryl methacrylate) (PLMA) by means of calorimetry, small-angle X-ray scattering (SAXS), and dielectric spectroscopy are investigated. It is reported that the inherent immiscibility between the parent homopolymers, combined with the increased molar mass, results in strong segregation, maintained up to elevated temperatures (i.e., T = 423 K). SAXS reveals that well-separated POEGMA and PLMA domains self-assemble into spheres with bicontinuous cubic packing and in lamellar nanostructure in copolymers with respective compositions of 16 and 52 wt.% PLMA. This strong segregation enables the weak crystallization/melting of the short ethylene glycol chains. Additionally, molecular dynamics are investigated through isothermal dielectric and calorimetry measurements. The segmental dynamics (i.e., Tg-related) of POEGMA and PLMA closely resemble that found in respective homopolymers, implying heterogeneous dynamics. In the glassy state, the local motions of the POEGMA side chains predominantly govern the observed secondary processes in the copolymers. The results on the heterogeneous dynamics in the current amphiphilic diblock copolymers with the densely grafted architecture are compared and contrasted with copolymers having a bottle–brush architecture lacking the amphiphilic nature.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 19","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177864","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}

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