Methanolysis degradation coupled with nonsolvent precipitation of bio-based poly(3-hydroxybutyrate-co-4- hydroxybutyrate) and characterizations of the resulting oligomers
學年 114
學期 2
出版（發表）日期 2026-06-01
作品名稱 Methanolysis degradation coupled with nonsolvent precipitation of bio-based poly(3-hydroxybutyrate-co-4- hydroxybutyrate) and characterizations of the resulting oligomers
作品名稱（其他語言）
著者 Yit Thai Ong; I-Hsuan Yang; Ting-Min Chen; Trong-Ming Don
單位
出版者
著錄名稱、卷期、頁數 Polymer Degradation and Stability 248, p.112042
摘要 Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB), a bio-based copolymer, possesses a wide range of physical and mechanical properties simply by varying the 4HB composition. Furthermore, P34HB can be blended with other polymers to develop biodegradable blends with improved physical or mechanical properties. Yet P34HB is immiscible with most polymers. One approach to improve the miscibility is to lower its molecular weight. In this study, P34HB was degraded by methanolysis to obtain low-molecular-weight P34HB oligomers. The results showed that the acid-catalyzed methanolysis did not exhibit a significant preference for either 3HB or 4HB units in the P34HB, and the degradation followed a pseudo-first-order kinetics with an activation energy of 38.78 kJ/mol. Moreover, the potential of further fractionation of the as-prepared P34HB oligomers in the organic solvent by the addition of excess methanol to obtain a narrower molecular weight distribution was exploited. The results showed that P34HB oligomers with higher degrees of polymerization (DP) and lower 4HB contents preferentially precipitated from the solution, which had dispersity values of less than 1.50. The Flory–Huggins lattice model combined with interaction parameters estimated from solubility parameters could well describe the observed miscibility behaviors of P34HB in methanol/chloroform (5/1, v/v). The free energy change decreases monotonically with decreasing DP owing to the increased entropy, and with increasing 4HB content due to the decreased interaction parameter. The molecular weight, dispersity, and composition of the P34HB oligomers could thus be controlled by degradation temperature, reaction time, and nonsolvent fractionation.
關鍵字
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Trong-Ming Don
審稿制度 是
國別 NLD
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/129797 )