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本文采用了四氯乙烷-甲醇和三氯乙烯-庚烷两组具有不同溶解性能的分级体系,利用交叉分级方法对聚对苯二甲酸乙二醇酯-聚四亚甲基醚多嵌段共聚物(PET-PTMG)进行分级。测定了各级分的数均分子量,在氯仿溶剂中,30℃时的特性粘数以及分子量多分散系数(M_W/M_n)。结果表明,在PET含量由14.4%—26.0%,数均分子量由1×10~4—1×10~5范围内,PET-PTMG可近似用一个MHS方程表征特性粘数与分子量关系。[η]=4.60×10~(-2)M_η~(0.09)试样的数均分子量M_n可由下式计算[η]=4.60×10~(-2)(M_W/M_n~(0.58)M_n~(0.69)在订定MHS方程时,考虑了级分试样的分子量多分散性修正。
In this paper, tetrachloroethane - methanol and trichlorethylene - heptane two groups with different solubility of the grading system, the use of cross-classification method of polyethylene terephthalate - polytetramethylene ether multi-block Copolymer (PET-PTMG). The number average molecular weight of each fraction, intrinsic viscosity at 30 ° C and polydispersity (M_W / M_n) of molecular weight in a chloroform solvent were measured. The results show that PET-PTMG can approximate the relationship between intrinsic viscosity and molecular weight with an MHS equation in the range of PET content of 14.4% -26.0% and number average molecular weight of 1 × 10-4-1 × 10-5. η = 4.60 × 10 -2 M_η ~ 0.09 The number average molecular weight M_n of the sample can be calculated from the following equation: η = 4.60 × 10 -2 M_W / M_n ~ 0.58 M_n ~ (0.69) In formulating the MHS equation, the molecular weight polydispersity correction for the fractional sample was considered.