乙交酯-己内酯共聚物的功能化研究

以乙交酯和己内酯为起始原料,经开环聚合、上保护基团、脱保护基团三步反应合成了新型功能化乙交酯-己内酯共聚物,端氨基乙交酯-己内酯共聚物PGCL-NH2。采用红外光谱、DSC以及TGA对合成的共聚物及其中间产物进行了表征和分析。结果表明,此合成工艺路线是成功的,其为制备端氨基聚酯共聚物开辟了一条新途径。     

乙交酯-己内酯共聚物的功能化研究

以乙交酯和己内酯为起始原料,经开环聚合、上保护基团、脱保护基团三步反应合成了新型功能化乙交酯-己内酯共聚物,端氨基乙交酯-己内酯共聚物PGCL-NH2。采用红外光谱、DSC以及TGA对合成的共聚物及其中间产物进行了表征和分析。结果表明,此合成工艺路线是成功的,其为制备端氨基聚酯共聚物开辟了一条新途径。     

聚酯—乙烯基共聚物复合水分散液的结构研究

通过多种丙烯酸酯与苯乙烯的原位聚合反应制备了大分子链中含有羧基的水性自乳化聚酯－乙烯基共聚物的复合物，然后加入三乙胺中和及氨基树脂等制备了聚酯－乙烯基共聚物复合水分散液，通过FTIR与1H NMR进行了表征，实验结果表明，在单体原位聚合改性聚酯的过程中，同时生成聚酯的接枝共聚物，它们有助于复合水分散液的稳定性，进一步研究了由不同量的三乙胺中和得到的复合水分散液的粒子形态，发现在中和度较低的情况下，粒径分布宽，粒径较大但形状规整，在大粒子中间形成清晰的核壳两相结构，在中和度较高的情况下，粒径分布较窄，粒径较小但形状不规整，两相间的区别不十分明显。     

双马来酰亚胺／不饱和聚酯的共聚改性研究

利用4，4^ -二苯甲烷型双马来酰亚胺(BMD)作为共聚单体与不饱和聚酯(UP)进行共聚改性，对这一共聚体系的性能进行了研究：研究结果表明：双马来酰亚胺的引入对UP树脂的力学性能造成一定影响，尤其显著提高了共聚物热分解温度和热变形温度。从BMD的分子结构来看，BMD是四官能度，而且BMD具有优先与苯乙烯反应生成交替共聚物的倾向，提高了网络交联密度，在宏观上表现为共聚物的热性能及力学性能的变化。另外，红外光谱的分析表明双马来酰亚胺与不饱和聚酯固化形成交联网络。     

热塑性聚酯橡胶材料投放市场

热塑性聚酯橡胶材料投放市场国家受力结构工程塑料工程技术研究中心研制的年产３００ｔ热塑性聚酯弹性体装置近日完成了试车。热塑性聚酯弹性体又称聚酯橡胶，它是聚酯、聚醚的嵌段共聚物，通过调整各嵌段的组成和比例，可制得从柔软的橡胶至坚硬的塑料之间的一系列产品，...     

具有亚乙烯基共聚物涂层的聚酯单丝

将聚酯单丝用亚乙烯二氯共聚物进行预涂，就可以提高涂料与聚酯单丝或其织物之间的黏附力。     

内酯和环氧烷烃共聚合成聚酯-聚醚共聚物的研究进展

脂肪族聚酯作为一种高性能、多用途的生物可降解材料,被认为是具有吸引力的石油基聚合物替代品之一。现有的脂肪族聚酯存在的结构单一、亲水性差以及脆性较强等缺点,限制了其在医药卫生等领域的应用。因此,高效地实现聚酯的改性具有重要的理论研究意义和实际应用价值。其中,将醚类官能团与酯链段相结合得到聚醚-聚酯共聚物是提高聚酯性能的一类行之有效的改性方法。本文综述了内酯和环氧烷烃共聚合成聚酯-聚醚共聚物的研究进展。以共聚物的主链序列分类,分别介绍了嵌段、无规以及交替共聚物的合成方法以及相应聚合物的性质和性能。     

聚酯弹性体热熔胶的制备及其性能研究

以以聚酯弹性体、聚烯烃共聚物和增粘树脂共混制备了聚酯弹性体热熔胶,研究了聚烯烃共聚物和增粘树脂的含量对热熔胶粘接性能的影响,考查了热熔胶的耐水性能。结果表明,聚酯弹性体热熔胶适用于极性聚合物与金属材料的粘接复合,具有粘接强度高、耐水性能好的优点。     

丙烯酸酯共聚物及其阻尼材料

鉴于丙烯酸酯共聚物具有最大的对声音,振动的阻尼性能及其近搂来噪声对人们生活危害的严重性,本文从高聚物阻尼机理及丙烯酸酯共聚物的分子设计与阻尼性能关系出发,系统地综述了高聚物阻尼材料在消声,减振方面的作用原理及近年来丙烯酸酯高聚物在阻尼材料研究的应用进展情况。     

氨基功能化可降解聚酯共聚物的制备及性能

采用三步法合成了一种新型功能化乙丙交酯共聚物,主要包括端羟基乙丙交酯聚合物PLGA-OH的合成、含保护基乙丙交酯聚合物PLGA-BOC的合成以及端氨基乙丙交酯聚合物PLGA-NH_2的合成。采用红外光谱、核磁共振光谱、GPC以及DSC对合成的共聚物PLGA-NH_2及其中间产物进行了表征和分析。结果表明:此合成工艺路线是成功的,其为制备功能性聚酯共聚物开辟了一条新途径。     

以聚酯多元醇为基的聚氨酯弹性体的动态力学性能研究

合成了以聚酯多元醇为基的聚氨酯弹性体(PUE),研究了聚酯多元醇结构及相对分子质量、扩链剂类型及用量等因素对聚氨酯弹性体的动态力学性能的影响。结果表明:以相对分子质量为2000及3000的聚酯多元醇制得的PUE中存在明显的相分离;当扩链剂中带有苯环结构时,PUE的玻璃化转变温度(Tg)升高,储能模量增加,阻尼因子下降;PUE的Tg及储能模量随着扩链剂L-MOCA用量的增加线性升高,阻尼因子线性下降。     

二异氰酸酯封端聚酯多元醇型固化剂合成反应动力学的研究

以低分子聚酯多元醇与二异氰酸酯合成新型聚氨酯固化剂,分别研究了甲苯二异氰酸酯（TD I）、二苯基甲烷二异氰酸酯（MD I）与低分子聚酯多元醇的反应动力学。结果表明,TD I封端低分子聚酯多元醇的反应为二级反应,反应活化能为51.7 kJ/mol;MD I封端低分子聚酯多元醇的反应在反应温度低于70℃时也为二级反应,反应活化能为27.6 kJ/mol。     

Carbon black containing IPNs based on unsaturated polyester/epoxy. I. Dynamic mechanical properties,thermal analysis,and morphology

A series of carbon black containing interpenetrating polymer networks (IPNs) based on unsaturated polyester/epoxy (weight ratios 10/90, 20/80, 30/70) were developed. Scanning electronic microscopy exhibits that the compatibility was decreased and the morphology seemed to become less rigid as the content of unsaturated polyester increased in IPNs. The results also indicate that flame retardants were uniformly distributed in the IPN matrices. It is found that the heat resistance, damping, and mechanical properties were all improved simultaneously by adding the plate‐shaped carbon black flame retardants to the unsaturated polyester/epoxy IPNs. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1904–1910, 2002     

Synthesis and properties of polyester-based TPUs prepared by solution polymerisation

Abstract

The polyester based thermoplastic polyurethane elastomers (TPUs) were prepared by one-step solution polymerisation to obtain a product with completely linear molecular structure and with excellent solubility. The synthesis technique was determined by investigation of the influence of solvent and catalyst on the viscosity of the reaction system and the mechanical properties of the resulting product. The effects of the molecular structure on the mechanical, damping and crystallisation properties of TPUs were studied in terms of the type of diisocyanate, mass fraction of hard segment, type and molecular weight of soft segment, and type of chain extender. The structure and morphology of TPUs were characterised by FTIR, GPC and AFM analysis. There was microphase separation in the molecules of TPU, in which the hard-segment phase was dispersed in the soft-segment phase.     

利用废聚酯薄膜制备不饱和聚酯树脂工艺研究

以废聚酯薄膜(PET)为原料制得了不饱和聚酯树脂(UPR),通过产物酸值测定研究了反应温度、催化剂种类对聚酯薄膜降解反应的影响,通过固化性能测试及其浇注体和玻璃钢制品的力学和热性能测试确定了废聚酯薄膜的用量,并将制品的性能与邻苯型196#不饱和聚酯树脂作了比较。结果表明:采用有机锡类和醋酸锌的复合催化剂,反应温度210～225℃,废聚酯薄膜与顺丁烯二酸酐物质的量比1:2.7时UPR产品性能最优,其力学性能、耐热性和耐腐蚀性均优于196#UPR。     

Monitoring the cure of unsaturated polyester resins by pressure DSC and FTIR-PLC

A high pressure differential scanning calorimeter (DSC) and a Fourier transform infrared (FTIR) spectrometer with a prism liquid cell (PLC) were used to monitor the reaction kinetics of styrene-unsaturated polyester resins at elevated curing temperatures and pressures. The thermal method is easy to perform but provides only an overall reaction exotherm. The spectroscopic method can detect the detailed reaction mechanism of copolymerizations. It is, however, less quantitative and the calculation is much more time-consuming compared to the thermal analysis. Reactions of two unsaturated polyester resins with different molecular structure were measured by these two methods. Results showed that applying cure pressure on unsaturated polyester resins reduced the reaction rate but increased the final conversion. The styrene reaction was enhanced more than the polyester reaction at high curing temperatures.     

稀土元素化合物在聚酯聚合工艺中的催化作用

以不同的稀土金属元素化合物及稀土化合物/三氧化二锑复合物分别用作聚酯酯交换和缩聚催化剂,对各工艺参数进行分析,并对产品性能进行测试与表征.结果表明:稀土化合物可作为聚酯酯交换的催化剂和缩聚助催化剂;使用稀土化合物/三氧化二锑复合催化剂,能有效提高酯交换效率,缩短反应时间,降低酯交换开始温度,所得聚酯产品的色相优于普通三氧化二锑催化所得聚酯,结晶度比普通三氧化二锑催化所得聚酯的高,且重稀土有机化合物比轻稀土无机化合物催化效率更高.     

Microgelation in the curing reaction of unsaturated polyester resins

A series of unsaturated polyesters were synthesized with various chemical structures and molecular weights. These unsaturated polyesters were used to study the curing reaction with styrene by using gel permeation chromatography and differential scanning calorimetry. The variation of the size of microgel particles during the curing reaction in unsaturated polyester–styrene resins was studied by using gel permeation chromatography. The size and structure of the microgels depend strongly on the polymer chain length and the number of vinyl groups on each unsaturated polyester chain. Using the differential scanning calorimetric method, the conversion of styrene and polyester vinyl groups during the reaction was measured. The experimental results of this study revealed that microgel formation has a great effect on the curing reaction of unsaturated polyester resins. © 1994 John Wiley & Sons, Inc.     

在缩聚阶段加入废长丝醇解物生产纤维级聚酯

选择无油涤纶长丝的废丝,以醋酸锌作催化剂、乙二醇作醇解剂,在220℃左右进行醇解反应,然后经过滤除去未反应的杂质,以一定量添加到预缩聚反应釜中参与缩聚反应,造粒得到质量均匀的聚酯切片。测试结果表明:醇解产物添加量在质量分数0.2%以下时,制得切片的性能达到纤维级聚酯切片标准。     

钛系聚酯催化剂的研究进展

介绍了聚酯催化剂中锑、锗、钛三个系列的各自特点，综述了复合型钛系和超细TiO2型聚酯催化剂的最新进展，认为新型钛系催化剂催化活性更高，更环保，而且用它合成的聚酯产品色相好，热稳定性得到了改善。