ICCAS OpenIR
Transamidation in the in situ blending of polyamide 1212 with polyamide 6 through anionic polymerization of caprolactam
Wang, Xiao-Chun; Yang, Gui-Sheng; Zheng, Qiang
2007-09-01
Source PublicationCHINESE JOURNAL OF POLYMER SCIENCE
ISSN0256-7679
Volume25Issue:5Pages:473-481
Abstract20 wt% polyamide 12 (PA1212) pellets were dissolved in molten caprolactam. The caprolactam was then catalyzed at 180 degrees C and polymerized by means of anionic ring-opening polymerization to produce in situ blends of the resultant polyamide 6 (PA6) and PA1212. Mechanical blends with same ingredient were prepared through melt blending on a twin-screw extruder. Scanning electron microscopy (SEM) observation revealed that contrary to the mechanical blends with small spherulites embedded in the matrix, no phase- separation existed in the in situ blends. The results of thermal analysis by differential scanning calorimetry (DSC) showed that single melting peak and crystallization peak existed for the in situ blends, while two melting and crystallization peaks appeared for the mechanical blends. The in situ blend film and the mixed blend film, both cast from a dilute formic acid solution with a concentration of 0.5 g/L, remained similar crystallization and melting behavior as above. It is proved by solution C-13-NMR analysis that transamidation took place during the in situ blending, and it is suggested that the combination of temperature increasing and the basic surrounding derived from NaOH during polymerization resulted in the occurrence of transamidation. Furthermore, it is proposed that the interchange reaction between PA1212 and PA6 also resulted from the degradative reaction during the anionic polymerization.
KeywordTransamidation Polyamide Anionic Ring-opening Polymerization Nmr
Indexed BySCI
Language英语
WOS IDWOS:000250834100006
PublisherSPRINGER
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62780
Collection中国科学院化学研究所
Corresponding AuthorYang, Gui-Sheng
Affiliation1.Zhejiang Univ, Dept Polymer Sci & Engn, Hangzhou 310027, Peoples R China
2.Minist Educ, Key Lab Macromol Synth & Functionalizat, Hangzhou 310027, Peoples R China
3.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Wang, Xiao-Chun,Yang, Gui-Sheng,Zheng, Qiang. Transamidation in the in situ blending of polyamide 1212 with polyamide 6 through anionic polymerization of caprolactam[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2007,25(5):473-481.
APA Wang, Xiao-Chun,Yang, Gui-Sheng,&Zheng, Qiang.(2007).Transamidation in the in situ blending of polyamide 1212 with polyamide 6 through anionic polymerization of caprolactam.CHINESE JOURNAL OF POLYMER SCIENCE,25(5),473-481.
MLA Wang, Xiao-Chun,et al."Transamidation in the in situ blending of polyamide 1212 with polyamide 6 through anionic polymerization of caprolactam".CHINESE JOURNAL OF POLYMER SCIENCE 25.5(2007):473-481.
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