Method for synthesis and modification of bio-based polyamide

US12338324B2 · kind B2 · utility

Assignee

• Qingdao University of Science and Technology · CN

Inventors

• Chuanhui Gao · Qingdao, CN
• Jing Zhang · Shanghai, CN
• Yiliang Gao · Qingdao, CN
• Ying Ma
• Yuetao Liu · Shandong, CN
• Chuanxing Wang · Tangxia, CN
• Yumin WU · Dongguan, CN

Key dates

• Filing date: Apr 13, 2022
• Grant date: Jun 24, 2025
• Expiry date: Jan 4, 2044

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L79/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present disclosure is related to the field of polymer materials, and, in particular, to a method for synthesizing a bio-based polyamide. More specifically, the disclosure provides a method for synthesizing a block copolymer consisting of a hard segment of a polyamide prepared via solid state polycondensation and a soft segment of a polyether polyol. Due to a reaction of itaconic acid, which contains a carbon-carbon double bond, with hexamethylenediamine, the bio-based polyamide is greatly different from conventional linear polyamides and exhibits a lower glass transition temperature and excellent mechanical properties. Unlike conventional processes for preparing modified polyamides, the bio-based polyamide is synthesized, according to the method, through chain extension of a polyamide with an excess amount of a diisocyanate based on amine value of the polyamide and then crosslinking of the resulting product with a polyether polyol by using glycerol as a crosslinking agent.