苯乙烯─马来酸酐共聚物／聚硅氧烷纳米尺度复合材料的研究

用溶胶－凝胶方法制备了苯乙烯、马来酸酐和ｒ－缩水甘油丙基醚三甲氧基硅烷复合材料．利用红外光谱、动态力学分析、小角Ｘ－射线散射和原子力显微镜等手段研究了这种材料的结构与性能．结果表明，这种材料以三维网络和纳米微相分离的形式存在，其力学性能和耐热性能较苯乙烯－马来酸酐共聚物有大幅度提高，透明且不溶于丙酮．     

苯乙烯-马来酸酐自由基共聚反应 (Ⅰ)苯乙烯-马来酸酐电荷转移络合反应

电荷转移络合反应机理是研究苯乙烯－马来酸酐自由基交替共聚反应机理的关键。本文简述了苯乙烯－马来酸酐电荷转移络合反应的研究进展。     

苯乙烯—马来酸酐自由基共聚反应：（Ⅰ）苯乙烯—马来酸酐电荷转移络？…

电荷转移络合物反应机理是研究苯乙烯－马来酸酐自由基交替共聚反应机理的关键。本文简述了苯乙烯－马来酸酐电荷转移络合物的研究进展。     

苯乙烯－马来酸酐无规共聚合进展

本文系统介绍并评述了苯乙烯－马来酸酐无规共聚合研究的发展概况。讨论了共聚合动力学、聚合技术等对共聚物结构与性能的影响。认为该系列是一类具有广泛应用前景的耐热材料和共混助剂。     

苯乙烯—马来酸酐自由基共聚反应：（Ⅱ）苯乙烯—马来酸酐聚合反应机理

简要地综合苯乙烯－马来酸酐共聚反应机理和数学模型研究和进展。在一定程度上络合－解离模型更能说明苯乙烯－马来酸酐共聚过程。     

α-松油烯-马来酸酐加成物的气相色谱分析

气相色谱法直接测定α－松油佛－马来酸酐加成物，不但免去了容量滴定法测定时必先分离共存马来酸酐的繁琐手续，而且方法简便、快速，能满足合成过程中跟踪分析的需要。     

苯乙烯/马来酸酐共聚物修饰碳纳米管的研究

利用羟基碳纳米管上的羟基与马来酸酐之间的简单反应, 在碳纳米管上引入双键, 进一步引发苯乙烯聚合, 在碳纳米管表面接枝苯乙烯马来酸酐共聚物, 同时采用羟基碳纳米管与苯乙烯马来酸酐共聚物直接反应也在碳纳米管的表面引入了苯乙烯马来酸酐共聚物. 经IR, Raman, TG和TEM测定, 证明了碳纳米管与苯乙烯马来酸酐共聚物之间为化学键连接关系.     

通过RAFT聚合制备SiO2/接枝共聚物纳米杂化粒子

以二氧化硅(SiO2)纳米粒子表面键接的二硫代苯甲酸酯作为可逆加成-断裂-链转移(RAFT)聚合反应的链转移剂, 在室温下引发苯乙烯和马来酸酐进行表面RAFT交替共聚反应, 制得了SiO2/苯乙烯-alt-马来酸酐杂化材料. 通过聚氧化乙烯(PEO)的羟基与马来酸酐的酯化反应, 将PEO接枝到SiO2纳米粒子的表面, 增加了硅粒子的生物相容性. 用FTIR, TGA和TEM对杂化材料的结构、组成和形貌进行了表征.     

马来酸酐—苯乙烯本体自由基聚合反应

在杷来酸酐－苯乙烯本体聚合反应过程中，于７０℃和低引发剂浓度（０．５９－１．８×１０＾－３ｍｏｌ／Ｌ条件下，共聚物组成与单体的配比无关，生成无规共聚物；在高引发剂浓度（２×１０＾－２ｍｏｌ／Ｌ），随马来酸酐单体含量的增加，趋向生成１：１交替共聚物，温度的提高可以使生砀共聚物结构向１：１组成移动，当温度超过１４０℃时将生成无规共聚物，在本体聚合反应体系中，存在共聚反应和苯乙烯的均聚反应，而且随着的提     

具有多重玻璃化转变的梳状聚合物的合成,表征和导电性：侧链 …

以分子量为５５０的聚乙二醇单甲醚为侧链,苯乙烯／马来酸酐共的为骨架,合成了苯乙烯／马来酸酐共聚物多缩乙二醇酯。用红外光谱、元素分析、ＤＳＣ、热失重等方法,对合成条件、产物结构和性能进行了研究。结果表明：反应严格按照反应方程进行,精制产物是非晶的梳状聚合物。玻璃化转变温度为３０．６８℃,分解温度为１２０℃。对动态这性能及其锂盐复合物离子导电性进行了研究,表明α转变温度和β转变温度分别是２８℃他－４７     

Synthesis of poly(styrene-co-3-trimethoxysilyl propyl methacrylate) microspheres coated with polysiloxane layer

A procedure has been developed to coat micron-sized poly(styrene-co-3-trimethoxysilyl propyl methacrylate) microspheres with a smooth layer of polysiloxane by the hydrolysis and condensation of methyl trimethoxylsilane (MTMS). Firstly, polystyrene microspheres containing silanol groups were prepared by conventional dispersion polymerization using 3-(trimethoxysilyl) propyl methacrylate (MPS) as a functional comonomer in an ethanol/water medium. Secondly, the synthesis of the polysiloxane shell was carried out using a sol–gel process of MTMS. The thickness of the shells can be easily varied with different copolymer seeds and MTMS feed ratio. When we used copolymer particles with 2.00 μm diameter as seeds, the thickness of the polysiloxane shells can be varied from 0.10 to 0.18 μm. The core/shell structure of the composite microspheres was characterized by transmission electron microscope (TEM).     

聚硅氧烷/丙烯酸酯核/壳复合胶乳的粒径分布与成核机理

通过种子乳液法合成出具有高有机硅含量核 壳结构的聚硅氧烷 丙烯酸酯复合粒子 .研究了聚合方法、乳化剂浓度、引发剂浓度、单体滴加速度等工艺条件对复合乳液粒径尺寸、分布与形态的影响 ,并对复合乳液的成核机理进行了探讨 .研究表明 ,乳化剂浓度对乳液粒子的粒径分布和形态、结构有显著影响 ,引发剂浓度增加将使粒子粒径减小 ;相对一次投料法 ,种子乳液法生成的粒子分布窄 ,具有明显核壳结构 ,通过壳层单体滴加速度可以控制粒子的粒径尺寸和分布 ;而壳层丙烯酸酯聚合物主要是在聚硅氧烷种子表面的“过渡层”聚合、富集而成 .     

Surface and solution properties of polysiloxane–poly(methyl methacrylate) graft copolymer

A polysiloxane–poly(methyl methacrylate) (PMMA) graft copolymer was prepared by hydrosilylation reaction between a Si? H containing polysiloxane and an allyl-terminated PMMA. The obtained graft copolymer was blended with PMMA homopolymer. The addition of only 0.01 wt % of graft copolymer was sufficient to make PMMA surfaces hydrophobic. In acetone–cyclohexane mixed solvent, the graft copolymer formed a polymeric micelle by the aggregation of PMMA branches.     

低相对分子质量苯乙烯-马来酸酐交替共聚物的合成

将引发剂偶氮二异丁腈(AIBN)、共聚单体苯乙烯(St)和马来酸酐(MA)溶解于甲苯中,采用沉淀聚合法合成苯乙烯-马来酸酐共聚物(SMA).分别研究了反应温度、引发剂用量、反应时间、单体配比和单体浓度对聚合物得率和酸酐含量的影响.采用正交实验确定最优反应条件为:单体浓度20%,单体物质的量比为1∶1,引发剂用量为0.60%,反应温度为86℃,反应时间2h,产物得率为86.86%,酸酐含量为50.28%.并利用傅里叶变换红外光谱(FTIR)、核磁共振碳谱(~(13)C NMR)、凝胶渗透色谱(GPC)和热分析法分别研究聚合物的分子结构、相对分子质量及相对分子质量分布和热稳定性.结果表明产物是苯乙烯-马来酸酐交替共聚物,相对分子质量分布较窄,具有良好的热稳定性.     

Facile synthesis and applications of polypropylene/polydimethylsiloxane graft copolymer

It is of great significance to synthesize polyolefin/polysiloxane hybrid materials due to their unique combination of crystalline polyolefin segments and semiorganic polysiloxane segments. Herein, we report the syntheses of a novel polypropylene/polydimethylsiloxane (PP‐g‐PDMS) graft copolymer via the coupling reactions between maleic anhydride‐grafted PP and monoaminopropyl‐terminated PDMS. The chemical structures of PP‐g‐PDMS have been characterized by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and gel permeation chromatography (GPC). The correlation between reaction conditions and the structural parameters of PP‐g‐PDMS has been established. Consequently, the potential applications of resultant PP‐g‐PDMS were investigated, and the results showed that PP‐g‐PDMS can serve as an efficient compatibilizer in heterogeneous PP/PDMS blend system and also as an ideal processing aid for high‐viscosity PP.     

苯乙烯-马来酸酐共聚物的生物降解性研究

合成了一系列苯乙烯．马来酸酐共聚物(SMA)。并对共聚物的结构进行了表征。用土埋法和CO2释放法研究了共聚物的生物降解性。探讨了分子量、组成、环境等因素对生物降解性的影响,发现共聚物的分子量降低。降解率增大;共聚物中马来酸酐含量提高。降解率增大;适宜的环境有利于生物降解。     

A study of the ring size in the copolymer of divinyl ether and maleic anhydride by H-NMR spectroscopy

The well-known alternating 1:2 cyclocopolymer of divinyl ether (DVE) and maleic anhydride (MA) possesses a wide spectrum of biological activities, including antitumor. Recent research on the structure of a variety of cyclopolymers has raised a question about the ring size of this cyclocopolymer. In this article we report on an extensive spectroscopic study of its structure. By use of deuterated monomers the H-NMR peaks at δ 2.31, 3.47, 4.06, and 4.49 ppm with an area ratio of 2:1:1:1 were assigned to the hydrogens of methylenes, methines on the backbone anhydride unit, methines on the ring anhydride unit, and methines adjacent to oxygen on the cyclic ether ring, respectively. By examination of the possible isomeric structures of the bicyclic ring, the splitting of each peak group was further assigned for cis and trans disubstitutions on the anhydride unit. The splitting pattern from the 300-MHz NMR spectrum of the DVE-2,3-dideuteriomaleic anhydride (DMA) copolymer confirmed the unsymmetrical ring structure. ¹³C-NMR spectra were consistent with the conclusion from the H-NMR spectra. A chair-form, six-membered ring with predominantly trans geometry in the anhydride ring was assigned to the structure of DVE–MA copolymer. On the basis of little or no change in the ¹³C-NMR spectra of the copolymers prepared at different temperatures it was concluded that there was no significant change in structure with temperature. This led to the assignment of the energetically favored, six-membered ring structure to the copolymer prepared under these conditions. A mechanism for cyclocopolymerization, based on the HOMO–LUMO interaction of the comonomers and the intramolecular radical addition on the preoriented double bond, was proposed. This mechanism leads to the formation of the six-membered ring structure of the copolymer as the only product. A ¹³C-NMR study of the structure of the copolymer prepared in chloroform by Kunitake and Tsukino is being published as a companion article.     

Synthesis and characterization of biodegradable materials： PDLLA-（MAh-Diol）n-PDLLA copolymer

The novel biodegradable copolymer PDLLA-(MAH-Diol)_n-PDLLAwith unsaturated bond was synthesized by copolymerizing lactide and prepolymer, which was prepared by the polycondensation of maleic anhydride and poly(ethylene glycol), using p- toluene sulphonic acid as catalyst. The new copolymer has improved hydrophilicity and fexibility. The structure and properties of the novel polymers were studied by FTIR, NMR, GPC-MALLS and DSC.     

二(顺丁烯二酸异丙酯酰氧基)-异丙氧基钕及其与甲基丙烯酸甲酯共聚物的研究

用三异丙氧基钕与顺丁烯二酸酐反应合成含钕单体二（顺丁烯二酸异丙酯酰氧基） 异丙氧基钕，并与甲基丙烯酸甲酯（ＭＭＡ）共聚而制得含钕共聚物．用元素分析、ＩＲ、ＸＰＳ和ＳＥＭ对其结构进行表征，并研究了其热性能、光学性能和磁性．表明含钕共聚物是一种具有优异热稳定性、高透光率和大折光率，以及具有光选择吸收性和顺磁性的高分子材料