KINETIC STUDY OF THE POLYCONDENSATION OF 9-AMINO-NONANOIC ACID

9-Amino-nonaneic acid was polycondensed in boiling paraffin hydrocarbon medium, the water formed during the reaction was immediately carried away by the vapor of the medium. By using this technique, polycondensation ran very rapidly, and within 15 min. the extent of reaction (p) reached more than 95%, and after 3 hrs., p surpassed 99%. The number average molecular weight was higher than 40,000. These have never been reached as reported in literature.Because p can be pushed to over 99%, it is possible to study the complete course of polycondensation reactions. It was found that the reaction followed second order from the beginning up to p around 99%. Beyond this, the system became so viscous that a viscosity factor should be considered. This caused the reaction to be changed to third order.     

聚壬酰胺的制备纺丝及结构与性能测定

9-氨基壬酸系从癸二酸经单酯化、氨化和Hofmann重排制得。该单体以10克规模在玻璃管中和以4公斤量在15升聚合釜中,于260℃聚合成聚壬酰胺。聚合物在288℃纺丝,120℃牵伸,得到尼龙-9纤维。测定了聚合物和纤维的结构和多种性能。     

9-氨基壬酸缩聚反应的动力学研究

9-氨基壬酸在恒沸的惰性介质中进行缩聚反应,生成的水,立即被介质蒸汽带走,用此法,缩聚反应极快.在十五分钟内,反应程度p,即已达到95％以上,三小时后,P可达99％以上,分子量M_n可达40000,这些都是前人没有做到的。 由于P可达99％以上,此法有可能研究缩聚反应的全过程。发现9-氨基壬酸的缩聚,从开始到p=99％,遵循二级反应。此后由于体系过分粘稠,反应速度随分子量增高即端基减少而变慢,反应转变为三级。     

9-氨基壬酸的聚酰胺化

经新的合成路线制得9-氨基壬酸。所需的癸二酸由蓖麻油制得。