摘要
通过对5组相同结构不同相对分子质量的由二氨基二苯醚(ODA)和均苯四甲酸二酐(PMDA)在N,N-二甲基乙酰胺(DMAc)体系中聚合而成的均苯型聚酰胺酸——PAA(ODA/PMDA),进行凝胶渗透色谱和特性黏度[η]的测定实验,测定了5组PAA(ODA/PMDA)的珨Mn和珨Mw,并计算其相对分子质量分布:d1=2.18,d2=2.37,d3=1.97,d4=2.33,d5=2.42;室温下测定了PAA(ODA/PMDA)在DMAc中的Mark-Houwink方程参数,从而得到DMAc体系均苯型PAA(ODA/PMDA)的Mark-Houwink方程参数K1=2.34×10-5,α1=0.6867,K2=1.98×10-7,α2=0.9691。
The five kinds of pyromellitic poly（amic-acids） with different molecular weight and same structure were formed based on diaminodiphenyl ether （ODA） and pyromellitic dianhydride （PMDA） in N, N- dimethylacetamide （DMAc） system PAA（ODA/PMDA）. The different molecular weight of five pyromellitic poly（amic-acids） was determined by gel permeation chromatography （GPC） and viscosity method. Measured the molecular weight of Mn, Mw of PAA（ODA/PMDA） by GPC and calculated the molecular weight distribution at room temperature, that is, d1 = 2.18, d2 = 2.37, d3 = 1.97, d4 = 2.33, d5 = 2.42. Determination of Mark-Houwink constants of pyromellitic poly（amic-acids） in N, N-dimethylacetamide （DMAc） solution at room temperature. constants K1 and α1, K2 and α2 of PAA（ODA/PMDA）, that is,K1 = 2.34 × 10^-5, α1= 0. 6867, K2 = 1.98 ×10^-7, α2 =0.9691.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第11期137-140,145,共5页
Polymer Materials Science & Engineering
