纳米级PU-PMMA LIPN的制备与结构研究

以异佛尔酮二异氰酸酯(IPDI)、聚四氢呋喃醚二醇(PTMG)、聚醚多元醇(PPG3010)、二羟甲基丙酸(DMPA)等为主要原料,甲基丙烯酸甲酯(MMA)为降粘剂合成了聚氨酯(PU)-MMA乳液;采用无皂原位乳液聚合的方法,MMA在PU-MMA乳液内部聚合,制备了纳米级的PU-聚甲基丙烯酸甲酯(PMMA)乳液互穿聚合物网络(LIPN)。对PU-PMMA复合乳液的结构、乳胶粒子粒径、成膜后PU和PMMA两相的相容性进行了讨论。结果表明,PU-PMMA复合结构已经形成;乳胶粒子的粒径分布多在20 nm,由于比表面积较大,部分小粒径粒子发生了团聚;复合体系只有一个Tg且介于PU和PMMA的Tg之间;成膜后PU和PMMA的相畴小于50 nm。

Synthesis and Structure of Nano-Scale Interpenetration Network Polyurethane/Poly(methyl methacrylate)Composite Emulsions

Nano-scale latex interpenetrating polymer network of polyurethane/poly （ methyl methacrylate） was synthesized by condensation of isophorone diisocyanate （IPDI） on polytetrahydrofuran glycol （I：＇FMG） and polypropylene glycol （PPG） with dimethylol propionic acid （DMPA） and ethane diamine （EDA） as chain extenders and MMA was as the solvent, which was initiated via in-situ emulsion polymerization. The composite emulsion structure, particle size, the compatibility of PU and PMMA were discussed. The results demonstrated the formation of polyurethane/poly（ methyl methacrylate） composite emulsions, the particle size of composite emulsions was mainly at 20 nm, whereas there were some big ones due to the aggregation of small ones, there was only one Ts which was between Tg of PU and PMMA and the phase domain of two phase was less than 50 nm.