摘要
以丙醇胺、1,2,4-偏苯三酸酐和乙酸酐为原料合成了一种假AB2型单体,通过熔融聚合的方法得到了一种超支化聚(酯-酰胺)(简称PQ2)。将PQ2分级后得到了高分子量部分PQ2(H)和次高分子量部分PQ2(L)。加入质量分数为3%的PQ2(H)和PQ2(L),可将聚碳酸酯(PC)的熔融指数分别提高3.7和4.1倍。相比纯PC,PC/PQ2共混组分的拉伸强度没有明显变化,断裂伸长率稍有降低。
A hyperbranched poly(ester-amide) (defined as PQ_2) was prepared by melt polycondensation of a pseudo AB2 monomer, N-(3-acetoxyl propyl)-N-(2′, 4′-dicarboxylic benzoyl)amine at 220 ℃ under reduced pressure. The obtained polymer was graded into three parts by precipitating method. The insoluble part in cold DMSO was defined as PQ_2(H) and the soluble part in DMSO was further precipitated into methanol to obtain precipitate defined as PQ_2(L).The two grades can be dissolved in hot DMSO and trifluoroacetic acid. They both possess T_d higher than 350 ℃ and are used to modify the rheology of polycarbonate (PC). With addition of 3% of PQ_2(H) and PQ_2(L), the melting index of PC/PQ_2 melts are (3.1) and (4.7) times of that based on pure PC, respectively. Furthermore, the mechanical properties of PC/PQ_2 blends were also measured. The results indicate that both grades decrease the elongation at break to some extend with little influence on the tensile strength for the blends.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2005年第4期205-207,共3页
Polymer Materials Science & Engineering
基金
国家自然科学基金(20204005
50233030)
清华大学基础研究基金资助(JC2002030)
关键词
超支化聚(酯-酰胺)
分级
聚碳酸酯
流变改性
hyperbranched poly(ester-amide)
grading
polycarbonate
rheology modification
