Polymerisation of Dicarboxylic Acids or Their Activated Derivatives with Glycols

2 Polymerisation of Dicarboxylic Acids or Their Activated Derivatives with Glycols 

H0H2C-(CH0H)4-CH20H with H00C-(CH2)4-C00H with H0-(CH2)8-0H CAL [28] 

Azim and co-workers [29] described the CALB-catalysed synthesis of polybutylene succinate (PBS) via condensation polymerisation nsing a monophasic reaction mixture of dimethyl succinate and 1,4-BDO in bulk and in solution. 

Diphenyl ether was a preferred solvent to give PBS with higher MW at 60-90 °C after 24 h, the M values of PBS ranged from 2,000-8,000 Da. After 21 h, the reaction at 95 °C gave PBS with an M value of 38,000 Da. 

A regioselective direct dehydration polycondensation between a polyol sugar component, sorbitol, and an adipic acid was carried out with a CALB catalyst at 90 °C for 48 h. The product, polysorbityl adipate, was water-soluble the Mn and MW values were 10,880 and 17,030 Da, respectively. Sorbitol was esterified at the primary alcohol group of 1-and 6-positions with high regioselectivity (85 5%). To obtain a water-insoluble sorbitol polyester, sorbitol, adipic acid and 1,8-octanediol (molar ratio 15 50 35) were terpolymerised at 90 °C for 42 h. The methanol-insoluble portion (80%) had an MW of 1.17 x 10 [30]. 

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