Synthesis and characterization of ionomeric poly(vinyl butyral)
Synthesis and characterization of ionomeric poly(vinyl butyral)
复制标题
离聚物聚乙烯醇缩丁醛的合成与表征
DOI：
10.1002/app.1992.070440711
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发表时间：
1992
影响因子：
3
通讯作者：
A. Misra
中科院分区：
文献类型：
--
作者：
A. Dasgupta;D. David;A. Misra
采用缩聚法合成了新型聚乙烯醇缩丁醛离聚物（IPVB）。在该方法中，通过在聚（乙烯醇）的缩醛化过程中使用除丁醛之外的含离子醛，将离子基团永久地并入聚（乙烯醇缩丁醛）主链中。所得聚合物表现出离聚物体系的典型性质，即，由于聚合物中存在离子缔合，它们表现为“热可逆交联热塑性塑料”。离子缔合使聚合物在环境温度下表现为交联材料，而在较高温度（加工温度）下，离子缔合丧失，从而使聚合物流动。因此，在环境温度下，IPVB表现出增加的刚度，如由聚合物的储能模量所确定的，而在较高温度下，IPVB表现出与常规聚（乙烯醇缩丁醛）的模量和应力松弛性能相当的模量和应力松弛性能。IPVB的特征在于通过许多技术，包括，高分辨率NMR光谱（1H，13 C），稀溶液粘度，动态力学分析，和差示扫描量热法（DSC）。对增塑和未增塑的IPVB进行表征。
A route to synthesizing novel poly(vinyl butyral) ionomers (IPVB), via a condensation polymerization process, has been developed. In the process, ionic groups were permanently incorporated into the poly(vinyl butyral) backbone by using an ion-containing aldehyde in addition to butyraldehyde during the acetalization of poly(vinyl alcohol). The resulting polymers demonstrated properties typical of ionomer systems, i.e., they behaved as “thermally reversible crosslinked thermoplastics” due to the presence of ionic associations present in the polymers. The ionic associations enabled the polymers to behave as crosslinked materials at ambient temperatures, whereas, at higher temperatures (processing temperatures), the ionic associations were lost, thus allowing the polymers to flow. Consequently, at ambient temperatures, the IPVBs demonstrated increased stiffness as determined from the storage modulus of the polymers, whereas, at higher temperatures, the IPVBs demonstrated moduli and stress-relaxation properties comparable to those of conventional poly(vinyl butyral). The IPVBs were characterized by a number of techniques including, high resolution NMR spectroscopy (1H, 13C), dilute solution viscometry, dynamic mechanical analysis, and differential scanning calorimetry (DSC). Characterization was done on plasticized and unplasticized IPVBs.