水性PU嵌段离聚体的合成及其溶液行为研究

Synthesis of Waterborne PU Block Ionomers and Research on Their Solution Behavior

以聚乙二醇(PEG)、异佛尔酮二异氰酸酯(IPDI)和二羟甲基丙酸(DMPA)为共聚单体,二月桂酸二丁基锡(DBTL)为引发剂,三乙胺(TEA)为中和剂,采用溶液聚合法合成得到规整嵌段离聚体。以不同相对分子质量的PEG为软段,采用不同的n(DMPA)∶n(PEG)、n(—NCO)∶n(—OH)比例进行合成,获得了一系列嵌段离聚体。通过粒径、比浓黏度、旋转黏度、电导率和临界聚沉浓度,对离聚体的溶液行为进行了研究。水性PU嵌段离聚体粒径都在200nm左右;比浓黏度大多数都在1 min以内;水性PU嵌段离聚体是剪切变稀的,旋转黏度是转子在40 r/min条件下测得的;随PEG相对分子质量增大,水性PU嵌段离聚体的临界聚沉浓度ρ(Cc.c)减小。

With PEG/IPDI/DMPA as comonomer, DBTL as initiator, TEA as neutralizing agent, regular block ionomers were synthesized by solution polymerization process. With PEG （with different molecular weight） as soft segment, at different n （DMPA） ： n （ PEG）, n （ -NCO ） ： n （-OH）, a series of block iono- mers were obtained. Solution behavior of block ionomers was studied, in terms of the particle size, reduced viscosity, BF viscosity, conductivity and critical congregating concentration （p （ Cc. c） ）. Particle sizes of all waterborne PU block ionomers were around 200 nm ; most of their reduced viscosity was within 1 min ; waterborne PU block ionomers were shear thinning systems, the BF viscosity was measured at the speed of 40 rpm; with PEG molecular weight increasing, ρ（ Cc. c） of waterborne PU block ionomers decreased.