聚对苯二甲酸乙二酯的酰氯法固态聚合

用酰氯-固态缩聚法合成了不含金属盐催化剂的聚对苯二甲酸乙二酯(PET),其中含有不同量的二甘醇链结构,含量从0～16mol%。本文还对聚合物的链结构、分子量分布和聚合动力学作了初步探讨。     

CRYSTALLIZATION BEHAVIOR OF PURE AND ADDITIVE-CONTAINING POLY (ETHYLENE TEREPHTHALATE)

<正> The isothermal crystallization of poly （ethylene terephthalate ） （PET）,which is free of catalyst, stabilizer, oligomer and diethylene glycol （DEG）, was studied by DSC. The crystallization behaviour of pure PET is different from commercial PET and a reasonable explanation is presented. The influences of catalyst, stabilizer, oligomer and DEG on the crystallization of pure PET were examined. It is shown that catalyst （Manganese acetate）and stabilizer （Triphenyl phosphite） result in an increase of the crystallization rate of PET; on the contrary, DEG and oligomer （cyclotetramer） result in a reduction of the crystallization rate. When catalyst and stabilizer coexist together, both of them promote the crystallization at lower temperature ,only a smaller effect was found at higher temperature, it is evident that metal phosphite is formed between the catalyst and stabilizer at higher temperature.     

WAXD STUDY OF POLYMORPHOUS ISOTACTICPOLYPROPYLENE BY COMPUTER PEAK-RESOLUTION METHOD

Polymorphous i-PP containing a and β phases were studied by WAXD and computer peak-resolution method (CPRM). The asymmetric Gaussian-Cauchy functions (a-GC) were adoptedto fit the profiles of both amorphous and crystalline peaks. For the crystalline peaks, the fitting resultsof a-GC are better than the symmetric-GC; for the amorphous peaks, they are better than polynomialand exponential functions, etc. Using the retarded least-square procedure (RLSP) on microcom-puter the results of peak-resolution are rather satisfatory.For the polymorphous samples containing αand β phases,the relations between phase-state,crystallinity,crystalline size,the ratio of α,β relative content and the crystallization temperature Tc were studied by CPRM.The ratio of α,β relative contents obtained by CPRM and Turner-Jones eq have been carefully compared.There are many improvements in this work.A simple estimation method of WAXD peak areas,both for amorphous and crystalline peaks,is suggested.