This reaction proceeds by direct condensation between two linear monomers, i.e. linear 6-hydroxycaproic acid and linear 5-hydroxyvaleric acid produced by hydrolysis of the cyclic CL and VL, respectively. It was found by ~H-NMR that the molar ratio in the copolymer is markedly different from that in
Direct copolymerization of l-lactic acid with δ-valerolactone in the absence of catalysts
✍ Scribed by Hironobu Fukuzaki; Masaru Yoshida; Masaharu Asano; Yoshikazu Aiba; Isao Kaetsu
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 533 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0014-3057
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Glycolic acid (GA) was copolymerized with various lactones such as 7-butyrolactone (BL), 6-valerolactone (VL) and E-caprolactone (CL) in the presence of water without catalysts at 200°C under N2, giving relatively low molecular weight polyesters. This reaction is characterized by direct condensation
Poly(L-lactic acid) (PLLA) was produced by the melt polycondensation of L-lactic acid. For the optimization of the reaction conditions, various catalyst systems were examined at different temperature and reaction times. It was discovered that Sn(II) catalysts activated by various proton acids can pr
## Abstract The crystalline structure and crystallization behavior of PLLA crystals in a 1:1 w/w mixture of low‐MW PLLA with high‐MW PDLA were analyzed using WAXD, DSC, and SAXS. Under cold crystallization, homopolymeric PLLA, appearing as a meta crystal, was discovered in the PDLA/LMW‐PLLA blend.
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