中文摘要：

研究使用氢化钙代替吡啶作为酸吸收剂合成高分子量聚对苯二甲酰对苯二胺（PPTA）,并与以吡啶作酸吸收剂的聚合产物进行对比以评估该研究的应用前景.尝试以氢化钙代替吡啶,考察氢化钙的加入对TPC与PPD的聚合过程及聚合产物分子量和结构的影响.研究结果表明,添加氢化钙可以聚合出高分子量PPTA.元素分析、X-射线衍射及红外光谱分析结果表明,使用氢化钙和吡啶作为酸吸收剂合成的PPTA在元素含量和结构上均相同.热重分析结果表明,使用两种酸吸收剂得到的PPTA的热分解温度都在550℃左右.这些研究结果初步证明使用氢化钙代替吡啶进行高分子量PPTA工业聚合是可行的.

英文摘要：

A new acid absorbent of calcium hydride was used in the synthesis of high molecular weight poly（p-phenylene terephthalamide） （PPTA） and compared with the traditional acid absorbent of pyridine. Pyridine utilized as acid absorbent in terephthaloyl chloride and p-phenylenediamine condensation polymerization is helpful to get high molecular weight product,however,it is difficult to separate pyridine with other agents in further agent recycling process,which is unacceptable in PPTA industrial production. This work investigates the effect of calcium hydride replacing pyridine as acid absorbent on the PPTA synthesis process and the chemical structure of resulted PPTA. Multiple instrumental measurements such as element analysis, Fourier transform infrared spectrometry （ FTIR）, X-ray diffraction （ XRD ） and thermogravimetric analysis （TGA） were carried out in the characterization of the yielded products. Inherent viscosity data showed th~l high molecular weight PPTA could be obtained with calcium hydride as acid absorbent. On the oth~~r h~Lnd, there existed an optimum addition amount of calcium hydride at which high molecular weight PPTA with inherent viscosity high over 6.5 could be obtained. Element analysis,infrared spectroscopy and XRD gave that no difference in element content, molecular structure and crystal structure could be recognized from the products using the two acid absorbents. TGA curves showed that the products using both acid absorbents degraded at approximately 550°C. All the results demonstrate it is feasible to synthesize high molecular weight PPTA using calcium hydride as acid absorbent in large scale production of PPTA.