We used Ma and MMAto modify PVAc by copolymerisation, by this way, we got some kinds of newLPAs that had better shrinkage control effect than ever.

• 其次，本文研究主要集中在通过共聚改性聚醋酸乙烯酯的方法，合成了醋酸乙烯酯一甲基丙烯酸甲酯共聚物、醋酸乙烯酯一顺丁烯二酸共聚物等等多种收缩控制效果好且与UP树脂相容性好的低收缩添加剂。