通过改变聚氨酯的催化剂,制备出不同凝胶顺序的增塑聚氨酯／聚甲基丙烯酸缩水甘油酯同步互穿网络。采用FT-IR法跟踪网络形成的动力学。所制得的不同凝胶顺序的样品呈现完全相反的物理和力学性能。聚氨酯先凝胶的SIN样品是透明的,质地很脆;而聚甲基丙烯酸缩水甘油酯先凝胶的样品为不透明的,具有很好的弹性。通过透射电子显微镜(TEM)和动态力学分析法(DMA),从不同的侧面,对它们完全相反的性能作出了解释。
The simultaneous interpenetrating network sample with different gelation sequences based on plasticized polyurethane(PU) and poly(glycidyl methacrylate)(PGMA) were prepared by changing the PU catalyst. The kinetics of network formation was monitored by FT-IR. The obtained samples with different gelation sequences show opposite physical and mechanical properties. The sample with PU gelling first is transparent and brittle, while the sample with PGMA gelling first is opaque and high elastic. The TEM and DMA methods were used to investigate the microstructures of these samples from different aspects to explain their completely different properties.
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