Influence of Hydroxyvalerate Content on the Crystallization Kinetics of Poly(hydroxybutyrate-co-hydroxyvalerate)
學年 91
學期 2
出版（發表）日期 2003-03-01
作品名稱 Influence of Hydroxyvalerate Content on the Crystallization Kinetics of Poly(hydroxybutyrate-co-hydroxyvalerate)
作品名稱（其他語言）
著者 You, Jiang-wen; Chiu, Hsiu-jung; Shu, Wei-jeng; 董崇民; Don, Trong-ming
單位 淡江大學化學工程與材料工程學系
出版者 Dordrecht: Springer Netherlands
著錄名稱、卷期、頁數 Journal of Polymer Research 10(1), pp.47-54
摘要 Influence of hydroxyvalerate (HV) content on the crystallization kinetics of hydroxybutyrate (HB) units in random poly(hydroxybutyrate-co-hydroxyvalerate) (P(HB-co-HV)) copolymers has been studied by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). It was found that the crystallization kinetics of HB units was strongly affected by the presence of the ethyl side chain of HV units whether under the non-isothermal or isothermal crystallization conditions. The spherulitic growth rate (G) and overallall crystallization rate (k n ) of HB units decreased with increasing HV content. Both G and k n exhibited the maxima, G max  and k n max , which showed a gradual shift toward lower temperatures with increasing HV content, which may be attributed to the depression in the equilibrium melting point (T m 0) and nucleation factor (K g). The temperature corresponding k n max  was different from G max  due to the depression of nucleation rate with the degree of undercooling was more susceptible than that of the growth rate. According to the Lauritzen–Hoffman theory of secondary nucleation, the crystallization of HB units in P(HB-co-HV) copolymers was similar to that of neat PHB as regime III and n=4 growth process.
關鍵字 crystallization kinetics; overall crystallization rate; poly(hydroxybutyrate-co-hydroxyvalerate);spherulitic growth rate
語言 en
ISSN 1022-9760
期刊性質 國外
收錄於
產學合作
通訊作者
審稿制度
國別 NLD
公開徵稿
出版型式 紙本
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