利用呋喃/马来酰亚胺Diels-Alder反应实现聚甲基丙烯酸丁酯/聚苯乙烯合金相容

利用呋喃和马来酰亚胺之间的可逆Diels-Alder反应,对不相容的聚甲基丙烯酸正丁酯(Poly(n-butyl methacrylate),PBMA)/聚苯乙烯(Polystyrene,PS)合金进行了增容研究。 首先,通过原子转移自由基聚合(ATRP)共聚合成侧基含呋喃基团的聚甲基丙烯酸正丁酯(P(BMA-co-FMA)),并通过后反应改性合成侧基含马来酰亚胺基团的聚苯乙烯(MPS),然后利用呋喃和马来酰亚胺基团之间的Diels-Alder反应促使该共混物中两种高分子的相容性得到明显改善,本实验通过核磁共振波谱仪(NMR)表征验证了功能化高分子及其共混物中的Diels-Alder反应,并通过透射电子显微镜观测相分离结构变化和差示扫描量热法测定相变温度证明了相容性的明显改善。 共混物可以进行热塑性加工,且其相形态和力学性能可以通过控制反应时间予以调节,三点弯曲试验发现随着反应时间的延长共混物逐渐由韧性材料向脆性材料转变。

Poly(n-butyl methacrylate)/Polystyrene Blend Compatibilized by the Diels-Alder Reaction of Furan/Maleimide

The compatibilization of immiscible poly(n-butyl methacrylate)(PBMA)/polystyrene(PS) blends was realized by the reaction of furan and maleimide groups. The furan-functionalized poly(n-butyl methacrylate)(P(BMA-co-FMA)) and maleimide-functionalized polystyrene(MPS) was synthesized by copolymerization and post-polymerization modification, respectively. The Diels-Alder reaction of the functionalized polymers and their blend were confirmed by nuclear magnetic resonance spectroscopy(NMR). The reaction of furan and maleimide dramatically promoted the compatibility of two components, confirmed by a homogeneous microstructure evidenced by transmission electron microscopy(TEM) observation and by the presence of a single glass transition temperature in the (P(BMA-co-FMA)/MPS blends. The properties of the blend materials could be controlled conveniently by adjusting the reaction time, and the blends transformed from tough material to brittle material gradually as the reaction processed, which was confirmed by the three point bending test.