Synthesis of succinic acid‐based polyamide through direct solid‐state polymerization method: Avoiding cyclization of succinic acid. Issue 39 (20th May 2021)

• Record Type: Journal Article
• Authors: Li, Haijie; Shang, Yuting; Huang, Wenrui; Xue, Bingfeng; Zhang, Xiaomeng; Cui, Zhe; Fu, Peng; Pang, Xinchang; Zhao, Qingxiang; Liu, Minying
• Is Part Of: Journal of applied polymer science. Volume 138:Issue 39(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-05-20
• Subjects: applications -- copolymers -- polyamides -- polycondensation -- synthesis and processing techniques; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.51017
• Languages: English
• ISSNs: 0021-8995

Abstract

Abstract: Succinic acid is an important synthetic monomer but it is difficult to use it as a precursor for synthesizing high molecular weight polyamide, due to its tendency to perform intra‐cyclization reaction at high temperature. In order to solve this problem, in this paper, the direct solid‐state polymerization (DSSP) method with the initial reactant, nylon salt which was composed of 1, 5‐diaminopentane, succinic acid, and terephthalic acid, was applied to synthesize the bio‐based copolyamide PA 5T/54. In comparison with the conventional melting polymerization method, the DSSP method can prevent the cyclization reaction of succinic acid effectively due to the lower reacting temperature as well as the restriction effect of the nylon salt. As a result, the product fabricated by DSSP method has higher molecular weight and much lighter color from red to white. Therefore, the DSSP method is advantageous for the synthesis of the polymers or copolymers composed of the succinic acid as the monomer. Furthermore, the polymerization mechanism proposed in this work can serve as a guidance for the design of the molecular structure and control of the polymerization process. Abstract : The direct solid‐state polymerization can take place at the lower temperature and pressure by the collision of end functional groups, thus the side reacts, like cyclization react of succinic acid, can be avoided effectively.