Microwave syntheses of poly(?-caprolactam-co-?-caprolactone)

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

“…Compared to conventional procedures, higher yields and higher amide content were observed, the latter implying a higher value for the glass transition temperature (T g ) of the copolymer (Fang et al, 2000). More recently, a series of completely biodegradable poly(vinyl alcohol)-graft-poly(ε-caprolactone) comb-like copolymers were prepared employing poly(vinyl alcohol) as an initiator for the microwave assisted ROP of ε-CL.…”

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“…Because glycine anhydride is a weak base, a much stronger base than glycine anhydride is needed to open and polymerize glycine anhydride. Dibutyltin(IV) diacetate, a nonionic catalyst like Sn(OCt) 2 , and t-BuOK, a stronger base than Sn(OCt) 2 , commonly used in anionic ring-opening polymerization of cyclic amides or lactams for preparation of polyamides [29][30][31] or polypeptides 12 , were investigated. Previous studies reported that an initiator such as t-BuOK rapidly initiates lactide polymerization, but side reactions, such as deprotonation, causing racemization of the lactide monomer, are also induced 32 .…”

Concept and Synthesis of Poly(ester amide)s with One Isolated, Two or Three Consecutive Amide Bonds Randomly Distributed Along the Polyester Backbone

“…Such PEAs can be prepared by condensing either (i) lactones with lactams or (ii) lactones and lactams with diamines, diols and diacid derivatives [1][2][3][4][5][6][7][8][9][10][11]. BAK ® 1095, a commercial product from Bayer is a random semi-crystalline PEA based on ε-caprolactam, 1,4-butanediol and adipic acid [1,2].…”

“…Ringopening co-polymerization of lactones and lactams affords random co-polymers [1,2,[4][5][6][7][8][9][10][11][104][105][106][107]. Aliphatic and/or aromatic dicarboxylic acids and diols with varying number of methylene groups give rise to various microstructures and architectures.…”