Macromolecular Chemistry and Physics最新文献_第10页

Properties and Mechanism of Friction-Reducing Silicone Rubber Modified with Hyperbranched Polysiloxane 超支化聚硅氧烷改性减摩硅橡胶的性能和机理

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-27 DOI: 10.1002/macp.202400083

Xiaoxue Ai, Xiaoping Wang

{"title":"Properties and Mechanism of Friction-Reducing Silicone Rubber Modified with Hyperbranched Polysiloxane","authors":"Xiaoxue Ai, Xiaoping Wang","doi":"10.1002/macp.202400083","DOIUrl":"10.1002/macp.202400083","url":null,"abstract":"During the utilization of silicone rubber, excessive friction can cause damage to the contact surface and the material itself. Therefore, friction-reducing modification of silicone rubber has attracted much attention. In this paper, hyperbranched polysiloxanes with different structures is synthesized for friction-reducing modification of silicone rubber. Infrared spectroscopy, nuclear magnetic resonance spectroscopy, and amine titration tests reveal that hyperbranched polysiloxanes are successfully synthesized by the hydrolytic condensation of 3-aminopropyltriethoxysilane and their Michael addition with four acrylates with different alkyl chains. The friction coefficients and mechanical properties of silicone rubber are evaluated. Hyperbranched polysiloxanes significantly reduces friction and maintained excellent mechanical properties of silicone rubber. Silicone rubber with butyl-ester-secondary-amino hyperbranched polysiloxane displays the best overall performance, with static and dynamic friction coefficients decreasing by 33.99% and 43.16% compared with that of pure silicone rubber, respectively, and a tensile strength of 10.80 MPa. The friction-reducing mechanism of hyperbranched polysiloxanes on silicone rubber is investigated by contact angle test and dynamic mechanical analysis. Hyperbranched polysiloxanes migrates to the surface due to the incompatibility of alkyl chains with silicone rubber matrix. Consequently, the shielding effect produced by hyperbranched polysiloxanes on the surface depresses the adsorption activity of silicone rubber surface thereby reducing friction.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 17","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189285","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 of Aldehyde-Functionalized Fluorescent Micelles by Self-Assembly of a Hybrid Polymer Constructed by Hyperbranched Conjugated Polymer Core with Aldehyde End groups and Polyethylene Glycol Shell 通过自组装由带醛端基的超支化共轭聚合物核心和聚乙二醇外壳构建的杂化聚合物合成醛功能化荧光胶束

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-24 DOI: 10.1002/macp.202400065

Qinglan Tan, Hui Liang

{"title":"Synthesis of Aldehyde-Functionalized Fluorescent Micelles by Self-Assembly of a Hybrid Polymer Constructed by Hyperbranched Conjugated Polymer Core with Aldehyde End groups and Polyethylene Glycol Shell","authors":"Qinglan Tan, Hui Liang","doi":"10.1002/macp.202400065","DOIUrl":"10.1002/macp.202400065","url":null,"abstract":"Water-dispersible fluorescent nano-/microspheres have been widely used as fluorescent probes in many fields. In this paper, aldehyde-functionalized fluorescent micelles are synthesized by self-assembly of end-modified hyperbranched poly(m-phenyleneethynylene-alter-p-phenyleneethynylene)(hb-PMPE). First, hb-PMPE with -Br end-groups(hb-PMPE-Br) is obtained by the polymerization of AB2 monomer PhBr2–C≡C–Ph–C≡CH, then the reaction of hb-PMPE-Br with 4-ethynylbenzaldehyde (EBA) gives end aldehyde-functionalized hyperbranched polymer hb-PMPE-CHO. Hence, hb-PMPE-CHO is reacted with aminooxy methoxypolyethylene glycol-2000 (NH2O-MPEG2000) to link poly(ethylene glycol) (PEG) chains to the ends of hb-PMPE-CHO with partial residual aldehyde end-groups, resulting in aldehyde-functionalized amphiphilic polymer hb-PMPE-PEG. Fluorescent micelles with aldehyde-containing fluorescent hb-PMPE core and PEG shell are obtained by self-assembling hb-PMPE-PEG in water. The micelle diameter is determined by the PEG content in hb-PMPE-PEG, which can be controlled by the reaction weight ratio of NH2O-MPEG2000/hb-PMPE-CHO. When the ratio of NH2O-MPEG2000/hb-PMPE-CHO > 0.75/1, micelles with a diameter < 50 nm are obtained. The water dispersion of hb-PMPE-PEG-1/2 micelles (28.9 nm) emits bright green fluorescence with λmax ≈ 490 nm under UV irradiation, and the emission intensity increases with increasing concentration.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 16","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141152723","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

Hybrid Single Crystals of Poly(ε-caprolactone) Homopolymers and Poly(ε-caprolactone)-b-Poly(ethylene oxide) Block Copolymers 聚（ε-己内酯）均聚物和聚（ε-己内酯）-b-聚（环氧乙烷）嵌段共聚物的杂化单晶体

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-24 DOI: 10.1002/macp.202400086

Chen Yang, Zi-Xian Li, Jun-Ting Xu

{"title":"Hybrid Single Crystals of Poly(ε-caprolactone) Homopolymers and Poly(ε-caprolactone)-b-Poly(ethylene oxide) Block Copolymers","authors":"Chen Yang, Zi-Xian Li, Jun-Ting Xu","doi":"10.1002/macp.202400086","DOIUrl":"10.1002/macp.202400086","url":null,"abstract":"Hybrid single crystals (HSCs) of different poly(ε-caprolactone) (PCL) homopolymers with a poly(ε-caprolactone)-b-poly(ethylene oxide) (PCL-b-PEO) block copolymer (BCP) are prepared. The effects of PCL length, PCL/PCL-b-PEO molar ratio, crystallization temperature (Tc), and solvent on crystal morphology are investigated. The optimal Tc for the formation of more perfect HSCs is between those for homocrystals of individual PCL and PCL-b-PEO and roughly increases with the length of PCL and PCL/PCL-b-PEO molar ratio. The chain folding in the HSCs is studied by comparing the experimentally measured heights obtained by atomic force microscopy (AFM) and theoretically calculated ones based on a sandwich structure model. Under most situations, the PCL homopolymers adopt a larger chain folding number in the HSCs than that in their homocrystals, while the chain folding of BCP remains unaltered. However, when both PCL homopolymer and PCL-b-PEO BCP crystallize slowly and the overcrowding of the PEO is effectively alleviated, thicker HSCs can be formed, in which the PCL homopolymer preserves the chain folding in its homocrystals but the BCP adopts a reduced chain folding number as compared with that in its homocrystals. The relative crystallization rate of PCL homopolymer versus BCP also affects the real composition and overall height of the HSCs.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 17","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141152725","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

MXene-CeO2@PDA Synergistically Enhanced Anticorrosion of Waterborne Epoxy Coating MXene-CeO2@PDA 协同增强水性环氧涂料的防腐效果

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-22 DOI: 10.1002/macp.202470020

Cansen Liu, Qingmei Chen, Canhai Cai, Jianyu Xu

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Masthead: Macromol. Chem. Phys. 10/2024 刊头：Macromol.Chem.10/2024

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-22 DOI: 10.1002/macp.202470021

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Facile Characterization of Isothermal Crystallization and Microphase Separation Kinetics of Polyamide 6 (PA6)-Based Thermoplastic Elastomers 聚酰胺 6 (PA6) 基热塑性弹性体等温结晶和微相分离动力学的简易表征

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-21 DOI: 10.1002/macp.202400058

Ruchao Yuan, Longfeng Zhang, Junfeng Zhang, Xueli Wang, Jianyong Yu, Faxue Li

{"title":"Facile Characterization of Isothermal Crystallization and Microphase Separation Kinetics of Polyamide 6 (PA6)-Based Thermoplastic Elastomers","authors":"Ruchao Yuan, Longfeng Zhang, Junfeng Zhang, Xueli Wang, Jianyong Yu, Faxue Li","doi":"10.1002/macp.202400058","DOIUrl":"10.1002/macp.202400058","url":null,"abstract":"The facile characterization of isothermal microphase separation kinetics in polyamide 6 (PA6)-based thermoplastic elastomers (TPAE-6) has long posed a challenge for the development of suitable melt spinning processes. In this study, this challenge is addressed through differential scanning calorimetry (DSC) measurements. It is assumed that the enthalpy changes of TPAE-6 during the isothermal process are a linear superposition of enthalpy changes associated with microphase separation and crystallization of PA6 in hard phases, resembling that of TPAE-6 without soft segments (TPAE-6-0). The study reveals that, as the concentration of soft segments in TPAE-6 increases, the accelerated dynamics of phase separation become stronger than the dilution of soft segments to PA6 segments during isothermal process, resulting in an increase in the microphase separation rate of TPAE-6. Furthermore, despite microphase separation, the overall crystallization rate of TPAE-6 decreases with rising isothermal temperature and varies with increasing soft segment content at different temperatures. Additionally, the crystallization mode of TPAE-6 follows two-dimensional, three-dimensional, or a combination of both crystal growth mechanisms, accompanied by a heterogeneous nucleation mechanism.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 15","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141115533","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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Effect of Layered Double Hydroxide and Its Localization on the Structure and Properties of PBAT/PPC Composites 层状双氢氧化物及其定位对 PBAT/PPC 复合材料结构和性能的影响

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-20 DOI: 10.1002/macp.202400078

Guo Jiang, Shengying Wang, Yihong Ren

{"title":"Effect of Layered Double Hydroxide and Its Localization on the Structure and Properties of PBAT/PPC Composites","authors":"Guo Jiang, Shengying Wang, Yihong Ren","doi":"10.1002/macp.202400078","DOIUrl":"10.1002/macp.202400078","url":null,"abstract":"The blends of poly(butylene adipate-co-terephthalate) (PBAT), poly(propylene carbonate) (PPC), chain extender (ADR) and layered double hydroxides (LDH) are prepared by different extrusion methods. Effects of LDH and its distribution on rheology, phase morphology, mechanical properties, water vapor barrier properties and food preservation properties are investigated. Results show that when PBAT, PPC, and LDH are mixed directly, LDH is preferentially distributed in the PBAT phase. When LDH are mixed with PPC firstly and then further with PBAT, LDH mostly migrates to the interface of PBAT and PPC. The epoxy groups of ADR react with the terminal groups of the polymers to improve the interfacial compatibility. Adding LDH, the mechanical properties and barrier properties of the materials are improved and by premixing of PPC and LDH, properties of composites are further improved. Compared with PBAT/PPC blends, the tensile strength and elongation at break of PBAT/PPC(LDH-0.5)/ADR increased by 25.2% and 15.3%, respectively. The banana packaged in PBAT/PPC/LDH films maintains good freshness. It illustrates that PBAT/PPC(LDH)/ADR composites have a good application prospect in the field of barrier and food packaging based on their excellent mechanical, barrier, and preservation properties.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 16","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141120075","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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The Third Compound Promoted Copolymerization of Ethylene with 4-Penten-1-ol by Using Metallocene Catalyst 第三种化合物利用茂金属催化剂促进乙烯与 4-戊烯-1-醇的共聚作用

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-17 DOI: 10.1002/macp.202400066

Wei Wang, Tianhao Guo, Shuzhang Qu, Taoyi Zhang, Xinwei Li

引用次数: 0

Polymer‐Protected Gold Nanoparticles for Photothermal Treatment of Ehrlich Adenocarcinoma: In Vitro and In Vivo Studies 用于艾氏腺癌光热治疗的聚合物保护金纳米粒子：体外和体内研究

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-14 DOI: 10.1002/macp.202400128

G. Tatykhanova, Rysgul N. Tuleyeva, Zhanar Nurakhmetova, Nargiz N. Gizatullina, V. Krasnoshtanov, Daulet B Kaldybekov, Vladimir O. Aseyev, Vitaliy V. Khutoryanskiy, S. Kudaibergenov

{"title":"Polymer‐Protected Gold Nanoparticles for Photothermal Treatment of Ehrlich Adenocarcinoma: In Vitro and In Vivo Studies","authors":"G. Tatykhanova, Rysgul N. Tuleyeva, Zhanar Nurakhmetova, Nargiz N. Gizatullina, V. Krasnoshtanov, Daulet B Kaldybekov, Vladimir O. Aseyev, Vitaliy V. Khutoryanskiy, S. Kudaibergenov","doi":"10.1002/macp.202400128","DOIUrl":"https://doi.org/10.1002/macp.202400128","url":null,"abstract":"Photothermal therapy (PTT) is recognized as an effective tool for the treatment of cancer and it has attracted considerable attention of scientists. In this work, gold nanospheres (AuNSs) and gold nanorods (AuNRs) stabilized using poly(N‐vinylpyrrolidone) (PVP), pristine gellan gum (PGG), and poly(2‐ethyl‐2‐oxazoline)‐grafted gellan gum (GG‐g‐PEtOx) are synthesized and evaluated as PTT agents in Ehrlich cancer cells. The physicochemical characteristics of these AuNSs and AuNRs, including their surface plasmon resonance absorption spectra, size, zeta potential, and aspect ratio are studied using UV–vis‐spectroscopy, dynamic light scattering, zeta potential, transmission electron microscopy, and optical microscopy techniques. The polymer‐protected AuNSs exhibit light‐to‐heat conversion, raising the temperature from 37 to 43 °C when irradiated using a visible light source. In the case of AuNSs, considerable damage to Ehrlich cancer cells is observed following irradiation and 40 days of examination. However, with regard to AuNSs, the damage to Ehrlich cancer cells is slightly lower than observed in AuNRs. In vivo experiments demonstrate that laser irradiation of tumors in mice after injecting AuNSs leads to a statistically significant decrease in tumor size as compared to those not irradiated and the control samples.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"78 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140978847","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

Correction to Effect of Chitosan on the Microstructural Properties of Zinc Ferrite Nanoparticles 更正壳聚糖对铁氧体锌纳米粒子微结构特性的影响

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-05-13 DOI: 10.1002/macp.202400130

引用次数: 0