Macromolecular Chemistry and Physics最新文献_第9页

Estimations of the Thicknesses of Smectic Layer and Rigid Amorphous Layer in Mesomorphic Isotactic Polypropylene with Synchrotron Small-Angle and Wide-Angle X-Ray Scattering

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-07 DOI: 10.1002/macp.202400328

Xiangyang Li, Tangguo Liu, Yongxing Lin, Lin Chen, Xingyou Tian

{"title":"Estimations of the Thicknesses of Smectic Layer and Rigid Amorphous Layer in Mesomorphic Isotactic Polypropylene with Synchrotron Small-Angle and Wide-Angle X-Ray Scattering","authors":"Xiangyang Li, Tangguo Liu, Yongxing Lin, Lin Chen, Xingyou Tian","doi":"10.1002/macp.202400328","DOIUrl":"https://doi.org/10.1002/macp.202400328","url":null,"abstract":"Despite extensive research, the stabilization mechanism of mesomorphic isotactic polypropylene (iPP) at room temperature has not been elucidated completely. To address this issue, nanoscale structural information is indispensable. In this study, mesomorphic-α phase transition is studied with synchrotron wide-angle diffraction and small-angle X-ray scattering. It is found that during phase transition, the mobile amorphous content remained unchanged, while rigid amorphous fraction (RAF) decreased constantly, accompanied by an increase in long period. Assuming that the increase in long period is induced by the extension of the rigid amorphous coil (RAC), the thickness of RAF (RRAF) is estimated, which is found to be 2.2 nm. This value is greater than the length of b axis in α crystal cell, which can be the reason that folded-chain iPP clusters in mesomorphic iPP cannot approach closer to form α crystal at room temperature. Besides, with RRAF, the thickness of smectic layer is estimated, which is found to be 0.9 nm. At this thickness, bulk-free energy cannot compensate for the folded-surface free energy, which can be the other reason that mesomorphic iPP chains cannot transit into α crystal at room temperature. The information obtained in this study is favorable for understanding the stabilization mechanism of mesomorphic iPP.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113303","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

Colorimetric Oxygen Sensing by Analyzing Chromaticity Points for Polymer Cobalt Schiff Base in CIELAB

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-07 DOI: 10.1002/macp.202400254

Takayuki Suzuki, Yuto Tachibana, Ayane Kamimura

{"title":"Colorimetric Oxygen Sensing by Analyzing Chromaticity Points for Polymer Cobalt Schiff Base in CIELAB","authors":"Takayuki Suzuki, Yuto Tachibana, Ayane Kamimura","doi":"10.1002/macp.202400254","DOIUrl":"https://doi.org/10.1002/macp.202400254","url":null,"abstract":"Polymer membranes of a copolymer ligand (L) coordinated to tetra-coordinated N,N'-ethylene bis(salicylideneiminato) cobalt(II) at the fifth coordinating site of the center cobalt(II), Co(II)S-L, are prepared to measure colorimetrically the color changes in response to rapid reversible oxygen binding simultaneously with slow oxidation under moist conditions to yield Co(III)S-L. The chromaticity point observed in CIELAB is the endpoint of the vector sum of the unit vectors for Co(II)S-L, O2-Co(II)S-L, and Co(III)S-L, scaled by their respective abundance ratios: (1 − m)(1 − n), m(1 − n), and n, where m is the ratio of O2-Co(II)S-L to the sum of Co(II)S-L and O2-Co(II)S-L and n is the ratio of Co(III)S-L to the total of the three cobalt complexes. The observed limited area in CIELAB as a stoichiometric Euclidean space is supported by the following two different reaction processes of the polymer membranes: an oxygen-binding reaction under several different partial pressures of oxygen supplied to the membranes in a short period, during which oxidation of the cobalt(II) complexes is negligible, and an oxidation reaction over a long period at a constant partial pressure of oxygen. The chromaticity points in both processes progress linearly in three different two-dimensional coordinates: a*b*, a*L*, and b*L*.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455742","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

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 : 2024-10-07 DOI: 10.1002/macp.202470038

Achilleas Pipertzis, Athanasios Skandalis, Stergios Pispas, George Floudas

引用次数: 0

Heterogeneous Catalysts Catalyzed Photo-Atom Transfer Radical Polymerization (Photo-ATRP) 多相催化剂催化的光原子转移自由基聚合（photoatrp）

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-09-28 DOI: 10.1002/macp.202400249

Guanying Chen, Xiaoyu Guo, Bo Hu, Lin Lei

引用次数: 0

Flexible Composites of Barium Sulfate Modified by Tannic Acid Using Glycerol/Starch for X-Ray Shielding Applications

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-09-28 DOI: 10.1002/macp.202400273

Ryoma Tokonami, Minoru Osanai, Masahiro Hosoda, Shinji Tokonami, Tatsuhiro Takahashi

{"title":"Flexible Composites of Barium Sulfate Modified by Tannic Acid Using Glycerol/Starch for X-Ray Shielding Applications","authors":"Ryoma Tokonami, Minoru Osanai, Masahiro Hosoda, Shinji Tokonami, Tatsuhiro Takahashi","doi":"10.1002/macp.202400273","DOIUrl":"https://doi.org/10.1002/macp.202400273","url":null,"abstract":"This study investigates the X-ray shielding properties and mechanical properties of barium sulfate (BaSO4) composites based on a biodegradable matrix composed of glycerol and starch. In addition, tannic acid (TA) is used for surface modification of the BaSO4. Increasing the amount of BaSO4 is necessary to improve the composite's X-ray shielding properties; however, as the amount of BaSO4 increases, the composite becomes harder. The purpose of this research is to prepare a flexible X-ray-shielding composite even when a large amount of filler is added. TA easily coats the BaSO4 surface, and its presence is confirmed by Fourier transform infrared spectroscopy and thermogravimetric analysis. Elongation of the composites composed of glycerol, starch, and BaSO4 is increased by 50% because of the formation of hydrogen bonds between the hydroxyl groups of glycerol and starch and those of TA. Consequently, the fracture behavior changed from brittle fracture to ductile fracture. However, the X-ray shielding properties are not changed by the surface modification with TA. The use of glycerol, starch, and BaSO4 is a new approach to the development of biodegradable radiation shielding materials. In addition, as a surface-modification agent, TA is environmentally friendly. All of the composites are prepared from natural materials.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143456084","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

Examining the Properties of (Co)Polymer Networks Prepared by the Phosphane-Ene Reaction 磷烯反应制备的（Co）聚合物网络的性能研究

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-09-26 DOI: 10.1002/macp.202400267

Mehrnoosh S. Raoofi, Jessica L. Bosso, James J. Noël, Johanna M. Blacquiere, Joe B. Gilroy, Paul J. Ragogna

{"title":"Examining the Properties of (Co)Polymer Networks Prepared by the Phosphane-Ene Reaction","authors":"Mehrnoosh S. Raoofi, Jessica L. Bosso, James J. Noël, Johanna M. Blacquiere, Joe B. Gilroy, Paul J. Ragogna","doi":"10.1002/macp.202400267","DOIUrl":"https://doi.org/10.1002/macp.202400267","url":null,"abstract":"Polymer networks have emerged as materials with widespread application, including their use in drug delivery, catalysis, and flexible electronics. They have traditionally been derived from organic building blocks using well-developed reaction types. Advances in main group synthetic chemistry have opened the door for the production of new polymer networks, including those containing phosphorus atoms that offer the traits of Lewis basic phosphorus centers. Here, the radical-catalyzed phosphane-ene reaction is used to prepare (co)polymer networks from iBuPH2, trivinyltriptycene (TVT), and 1,3,5-triallyl-1,3,5-triazine-2,4,6-trione (TTT), which are the first of their type to include TVT. Networks rich in TVT exhibited greater thermal stability and reduced network mobility compared to those rich in TTT. Despite the rigidity, 3D, and internal free volume associated with the triptycene units present in TVT-rich networks, their swellability is similar to networks rich in TTT indicating that the presence of phosphines may be a dominating factor in the respective structure-property relationships.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 24","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400267","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142869204","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

High-Performance Multipedal Shape Strain Sensors for Human Motion and Electrophysiological Signal Monitoring 用于人体运动和电生理信号监测的高性能多频谱形状应变传感器

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-09-25 DOI: 10.1002/macp.202400224

Gen Li, Rongtai Wan, Shuhan Liu, Lina Wang, Mangmang Yu, Jiang Zhong, Hanjun Yang, Ximei Liu, Baoyang Lu

{"title":"High-Performance Multipedal Shape Strain Sensors for Human Motion and Electrophysiological Signal Monitoring","authors":"Gen Li, Rongtai Wan, Shuhan Liu, Lina Wang, Mangmang Yu, Jiang Zhong, Hanjun Yang, Ximei Liu, Baoyang Lu","doi":"10.1002/macp.202400224","DOIUrl":"https://doi.org/10.1002/macp.202400224","url":null,"abstract":"Strain sensors from conducting polymer hydrogel have been widely employed in various wearable devices, electronic skins, and biomedical applications. These sensors provide outstanding flexibility and high sensitivity by integrating conducting polymer with hydrogels, making them particularly suitable for monitoring human motion and physiological signals like heart rate or muscle activity. Despite their extensive application potential, conducting polymer hydrogel face several technical challenges in practical use, including poor mechanical properties, lack of long-term stability, and difficulty in customizable design. This work introduces a method for fabricating a multipedal strain sensor using poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/polyvinyl alcohol (PVA) dimethyl sulfoxide (DMSO)hydrogels through screen printing and demonstrates its application in human motion monitoring. The multipedal strain sensor demonstrates a low Young's modulus (200 kPa), high stretchability (400%), and excellent mechanical cyclic stability (3000 cycles). Furthermore, this strain sensor is further applied to detect human movements such as chewing, smiling, fist clenching, arm bending, and carotid pulse monitoring. Comparative analysis between the multipedal-designed sensor and the non-designed sensor highlights the enhanced sensing capabilities of the multipedal sensor. The design of this multipedal sensor holds the potential to broaden the design concepts for strain sensors and offers new insights for wearable devices and electronic skins.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 22","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142692099","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

Synthesis and Magnetic Property of 4,4′-(2,6-Anthracenediyl)bis(2,6-di-tert-butylphenoxyl) Diradicaloids

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-09-23 DOI: 10.1002/macp.202400195

Takashi Kaneko, Ayako Ogawa, Masahiro Teraguchi, Toshiki Aoki

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Fabrication of Nanocomposite Hydrogels Based on Cellulose Nanocrystals and Multi-Walled Carbon Nanotubes for Human Motion Monitoring 制备基于纤维素纳米晶体和多壁碳纳米管的纳米复合水凝胶，用于人体运动监测

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-09-23 DOI: 10.1002/macp.202400207

Jiarui Liu, Lulu Wang, Liangjiu Bai, Wenxiang Wang, Lixia Yang, Hou Chen, Huawei Yang, Donglei Wei

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Masthead: Macromol. Chem. Phys. 18/2024 刊头：Macromol.Chem.18/2024

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-09-23 DOI: 10.1002/macp.202470037

引用次数: 0