温度和封端剂马来酸酐对聚碳酸亚丙酯黏均相对分子质量的影响

Effects of Temperature and End-capped Additive Maleic Anhydride on the Viscosity-average Molecular Weight of Poly(propylene carbonate)

考察了加工温度和封端剂马来酸酐(MAH)含量对聚碳酸亚丙酯(PPC)黏均相对分子质量的影响。结果表明,PPC对温度非常敏感,加工温度在120℃以上时,其黏均相对分子质量就有很大的下降,温度越高,下降得越多;少量的MAH对PPC的封端作用就很明显,加工温度相同时,MAH的添加量越多,对PPC的封端作用越强,但MAH的添加量不宜超过1%(质量分数,下同)。

Effects of processing temperatures and loading of maleic anhydride （MAH） on the viscosity-average molecular weight of poly（propylene carbonate） （PPC） were investigated. When the temperature was above 120 ℃, the viscosity-average molecular weight decreased obviously, and the hither the temperature, the lower the viscosity-average molecular weight . A small quantity of MAH had obviously effect on the end-capping of PPC, at the same processing temperature, the effect on the end-capping increased with increasing content of MAH. However, the loading of MAH should below 1 wt%.