Crystallizability of substituted poly(lactic acid)s: Effects of alkyl side-chain structure
| Autor: | Yuji Hamada, Ryo Mizukami, Hironori Marubayashi, Shuichi Nojima |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Chemistry 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Medicinal chemistry 0104 chemical sciences law.invention Lactic acid Crystallinity chemistry.chemical_compound Spherulite Mechanics of Materials law Materials Chemistry Side chain Crystallization 0210 nano-technology Isopropyl Alkyl |
| Zdroj: | Polymer Degradation and Stability. 153:318-324 |
| Popis: | The side-chain-substituted poly(lactic acid)s (SPLAs) having C3–C4 alkyl side chains (Pr, iPr, n-Bu, iBu, and s-Bu for propyl, isopropyl, n -butyl, isobutyl, and sec -butyl groups, respectively) were synthesized from l -amino acids, and their crystallizability was systematically investigated (unknown for Pr, n-Bu, and s-Bu but already known for iPr and iBu). s-Bu was found to be a crystalline polymer like iPr, whereas Pr and n-Bu had no or very little crystallizability like iBu. The crystal structure, melting behavior, and crystallization rate of s-Bu were examined in detail. The crystal structure and crystallinity (ca. 60%) of s-Bu were not affected at all by the crystallization temperature and casting solvent. The melting temperature and spherulite growth rate of s-Bu were compared with those of iPr and referenced data of SPLA with methyl side chains (Me) [i.e., poly( l -lactic acid)] and that with ethyl side chains (Et) [i.e., poly( l -2-hydroxybutanoic acid)]. The magnitude relation among melting temperatures of SPLAs would be iPr > s-Bu > Me > Et, and that among spherulite growth rates iPr > Me ≈ s-Bu > Et. |
| Databáze: | OpenAIRE |
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