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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)。
The effects of processing temperature and maleic anhydride (MAH) content on the viscosity-average molecular weight of poly-propylene carbonate (PPC) were investigated. The results showed that PPC was very sensitive to temperature. When the temperature was above 120 ℃, the viscosity-average molecular weight of PPC decreased greatly. The higher the temperature, the more the PPC decreased. Obviously, when the processing temperature is the same, the more MAH is added, the stronger the end effect of PPC is. However, the addition amount of MAH should not exceed 1% (mass fraction, the same below).