交联聚乙烯的生产应用及发展前景

介绍了交联聚乙烯的性能、用途以及发展前景,概述了交联聚乙烯的几种生产技术,包括辐射交联、过氧化物交联、硅烷交联、紫外光交联、盐交联等交联方法,提出了发展我国交联聚乙烯生产的一些建议。     

交联聚乙烯的生产应用及发展前景

介绍了交联聚乙烯的用途以及发展前景，概述了交联聚乙烯的生产技术，包括辐射交联、过氧化物交联、硅烷交联、紫外光交联、盐交联等交联方法，提出了发展我国交联聚乙烯生产的一些建议。     

复合交联淀粉在食品工业中的应用研究进展

复合交联淀粉以其优异的性能在食品工业中得到了广泛应用,本文综述了交联淀粉、交联醚化淀粉、交联酯化淀粉和交联氧化淀粉等复合交联淀粉的特点及其在食品工业中的应用,重点讨论了目前的研究热点及其今后的发展趋势,探讨了复合交联变性淀粉在食品工业领域的发展前景。     

水性丙烯酸酯树脂交联体系的研究进展

综述了水性AR(丙烯酸酯树脂)中常用的几种交联体系(包括酮羰基/酰肼基交联体系、氨基树脂/羟基交联体系、氮丙啶类化合物/羧基交联体系、环氧基交联体系、聚碳化二亚胺/羧基交联体系、异氰酸酯类交联体系、硅氧烷基团的水解缩聚交联体系以及环状碳酸酯/胺基交联体系等),并对其交联机制、性能和研究进展进行了介绍。最后对水性AR交联体系的未来发展方向进行了展望。     

水性聚氨酯室温交联技术研究进展

介绍了近年来国内外水性聚氨酯室温交联技术的研究进展,并对这些交联体系及其交联机理作了较为详细的阐述。其包括9种室温交联方式,即:1羰基与酰肼基团的交联;2基于Michael加成反应的交联;3异氰酸酯基团的交联;4氮丙啶与羧基的交联;5环状碳酸酯与胺基的交联;6不饱和脂肪酸中双键的自氧化交联;7脂环族环氧基团与羧基的交联;8金属离子与羧基、磺酸基等螯合作用交联;9硅氧烷基团的水解缩聚交联。     

交联聚乙烯开发应用与发展建议

综述了各种交联聚乙烯的生产技术，包括辐射交联、过氧化物交联、硅烷交联、紫外光交联、盐交联等交联方法。同时对交联聚乙烯在电线电缆、管材等领域的应用提出了我国发展交联聚乙烯的建议。     

单组分水性聚氨酯分散体常温交联改性体系及机理

介绍了国内外可用于水性聚氨酯涂料常温交联改性的体系及交联机理,包括硅氧烷基团的水解缩聚交联、不饱和脂肪酸的自动氧化交联、羰基与酰肼基团的交联、氮丙啶类衍生物交联、碳化二亚胺交联和羧基-环氧基交联等。最后指出水性聚氨酯交联改性的发展趋势。     

可逆交联聚合物的制备及研究进展

可逆交联聚合物通过可逆交联反应实现了高分子链的交联和解交联,使得其网络体系具有可重复加工性,大大拓宽眄其应用领域.介绍了不同种类可逆交联聚合物的制备方法、可逆交联机理和研究进展,并对其发展前景进行了展望.     

高交联度易加工硅烷交联管材专用料的研制

介绍了采用二步硅烷交联工艺制备高交联度易加工硅烷交联管材专用料的方法,讨论了基础树脂、助剂对专用料交联度和加工性能的影响;通过加入自由基捕捉剂的方法,抑制接枝反应过程中的碳-碳大分子交联,解决了二步法硅烷交联领域的技术瓶颈问题,使硅烷交联管材专用料既具有高的交联度又具有良好的加工性能.     

胶原纤维的物理交联改性及性能研究

通过干湿法纺丝制备I型鼠尾胶原初生纤维,采用重度脱水(DHT)和紫外线(UV)照射对胶原初生纤维进行物理交联改性,探讨了DHT交联的最优交联温度和交联时间以及UV交联的最优交联时间,并讨论了交联过程中拉伸应力的存在对纤维结构与性能的影响。结果表明:DHT交联和UV交联能显著改善胶原纤维的力学性能;采用DHT交联,在交联温度110℃、交联时间24 h、对纤维施加0.15 cN/dtex的拉伸应力时, DHT交联纤维的断裂强度可达2.07 cN/dtex,较胶原初生纤维提高25.5%;采用UV交联,交联时间8 h所得纤维的断裂强度较胶原初生纤维提高10.3%,拉伸应力对UV交联纤维的力学性能影响不大;DHT交联后胶原纤维的内部微纤结构更加致密,UV交联主要发生在纤维表面;DHT交联或UV交联后,胶原纤维的热稳定性都明显提高,在适宜拉伸应力下,DHT交联纤维和UV交联纤维的热变性温度较胶原初生纤维分别提高19.1℃和3.3℃。     

纤维素基水凝胶的研究进展

纤维素是世界上最丰富的天然、可再生以及可生物降解的高分子材料，在化工、材料等领域有广泛的应用。本文主要对近几年来纤维素基水凝胶的研究进展进行了归纳总结。首先，介绍了纤维素基水凝胶的研究背景。其次，列举了纤维素水基凝胶的交联方法，主要有物理交联与化学交联。其中物理交联有氢键交联、疏水性交联、离子交联等，化学交联则是酯化交联、迈克尔加成、自由基共聚合、动态共价键交联等。最后，重点介绍了纤维素基水凝胶在可降解性、生物医学性、亲水性、吸附性、导电性等领域方面的应用。此外，对于纤维素基水凝胶材料在高机械性和产业化制备等方面的发展进行了展望。     

PVC接枝改性及交联改性方法研究进展

综述了近年来聚氯乙烯（PVC）接枝改性和交联改性方法的研究进展;其中,接枝改性方法包括在PVC链的C原子上接枝含C、N、S元素基团等及其他亲核取代方法;交联改性方法包括过氧化物交联、三嗪化合物交联、双烯化合物交联、硅烷交联及其他化学交联方法等;最后,对PVC化学改性的发展前景进行了展望。     

聚乙烯敏化辐射交联研究进展

本文综述了应用辐射磁化剂以促进聚乙烯的辐射交联的研究进展，对敏化剂在聚乙烯辐射交联中的作用，敏化剂尤其是多官能团单体的敏化辐射交联反应机理，以及聚乙烯的链结构，聚集态结构与敏化辐射交联的关系进行了介绍，并简单地叙述了添加剂对聚乙烯敏化辐射交联的影响和聚乙烯共混体系的敏化辐射交联效应。     

超高相对分子质量聚乙烯交联研究进展

超高相对分子质量聚乙烯(UHMWPE)因其优异的综合性能被广泛用于人工关节替代等材料中,但磨损现象一直是造成替代关节破坏而失效的最重要因素。近年来通过交联提高UHMWPE的耐磨性已成为学术界研究的一大热点。综述了UHMWPE在交联方面的最新研究成果。研究重点集中在通过各种射线辐照、化学方法、硅烷接枝获得UHMWPE的交联。     

Nachträgliche Vernetzung von Polymeren

Some general aspects of crosslinking reactions and network structures derived from linear or branched polymers are discussed. A brief survey of recent publications in this field is given.     

高吸油性树脂的合成和应用

本文叙述了高吸油性树脂的合成和应用方面的最新发展，介绍了六种现有的合成方法，简要说明其结构特点以及吸油特性。六种合成方法包括：单烯—双烯化学交联，溶剂致孔的单烯—双烯化学交联，官能团化学交联，辐射化学交联，聚氨酯泡沫，复合材料。高吸油性树脂的结构特点是：高分子之间形成一种三维的交联网状结构，材料内部具有一定微孔结构。由于树脂分子内的亲油基链段和油分子的溶剂化作用，高吸油性树脂发生膨润。吸油过程由分子扩散控制和Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ方程控制两部分组成。适度交联，适当减小粒径可提高树脂的吸油速度。介绍了高吸油性树脂在三废处理、芳香剂、杀虫剂、诱鱼剂基材，纸张添加剂、渔网防污剂基材，合成树脂的改性添加剂等方面的应用     

Enzyme immobilization onto renewable polymeric matrixes: Past,present, and future trends

In this review, we present an overview of the different renewable polymers that are currently being used as matrixes for enzyme immobilization and their properties and of new developments in biocatalysts preparation and applications. Polymers obtained from renewable resources have attracted much attention in recent years because they are environmentally friendly and available in large quantities from natural sources. Different methods for the immobilization of enzymes with these matrixes are reviewed, in particular: (1) binding to a prefabricated biopolymer, (2) entrapment, and (3) crosslinking of enzyme molecules. Emphasis is given to relatively recent developments, such as the use of novel supports, novel entrapment methods and protocols of polymer derivatization, and the crosslinking of enzymes. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42125.     

Heat‐shrinkable polymer blends based on grafted low‐density polyethylene and polyurethane elastomer. Part I

Blends prepared by melt‐mixing of thermoplastic material‐elastomer have gained considerable attention in recent years. Heat‐shrinkability of polymer, which is dependent on elastic memory, can be introduced into the system in the form of an elastomeric phase. The present study deals with the measurement of the heat‐shrinkability of the blend of grafted polyethylene and polyurethane elastomer. Interchain crosslinking between grafted polyethylene and elastomer improves shrinkability. High‐temperature performance of the sample depends on the degree of interchain crosslinking. Probable interactions between the rubber and plastic phase are confirmed by IR spectroscopy. Extraction of the elastomeric phase is restricted due to interchain crosslinking as confirmed by SEM study. © 2000 Society of Chemical Industry     

Heat Shrinkable Polymer Blends Based on Grafted Polyethylene and Chlorosulphonated Polyethylene (Part I)

Abstract

Blend prepared by melt mixing of thermoplastic material-elastomer have gained considerable attention in recent years. Heat shrinkability of the polymer which depends on elastic memory can be introduced into the system in the form of an elastomeric phase. The present study deals with the measurement of heat shrinkability of the blend of grafted polyethylene with CSM. Interchain crosslinking between grafted polyethylene and elastomer improves the shrinkability. Crystallinity of the polymer blends also affected by interchain crosslinking, thus affecting the shrinkability. Probable interactions of the rubber and plastic phase are confirmed by IR spectroscopy. Extraction of the elastomeric phase is restricted due to interchain crosslinking as confirmed by SEM study.     

On the Heat Shrinkability and Interchain Crosslinking of Blends Consisting of Grafted Ethylene‐Propylene Polymer and Polyurethane Elastomer

Blends prepared by melt mixing of thermoplastic materials/elastomers have gained considerable attention in recent years from the viewpoint of heat shrinkability. The present study deals with the measurement of heat shrinkability of the blends of grafted ethylene‐propylene polymer and polyurethane elastomer. The used grafting materials are acrylic acid, vinyltriacetoxysilane, and glycidyl acrylate. Interchain crosslinking between grafted ethylene‐propylene polymer and polyurethane elastomer improves the heat shrinkability. The high temperature performance of the sample is dependent on interchain crosslinking. From torque rheometry it was observed that the maximum amount of interchain crosslinking occurred in the sample containing glycidyl acrylate as grafting material. The probable interaction between rubber and plastic phase was confirmed by IR spectroscopy.