Microstructural investigation of concentric-circled poly(L-lactic acid) spherulites with self-assembled nanofibrils
學年 100
學期 2
出版（發表）日期 2012-06-19
作品名稱 Microstructural investigation of concentric-circled poly(L-lactic acid) spherulites with self-assembled nanofibrils
作品名稱（其他語言）
著者 賴偉淇
單位 淡江大學化學工程與材料工程學系
出版者 Cambridge: R S C Publications
著錄名稱、卷期、頁數 RSC Advances 18, pp.7221-7227
摘要 The morphology and microstructure of poly(L-lactic acid) (PLLA) with different amounts of self-assembled 1,3:2,4-dibenzylidene-D-sorbitol (DBS) nanofibrils were examined using polarizing optical microscopy (POM), scanning electron microscopy (SEM), and small-angle X-ray scattering (SAXS). A small amount of DBS (less than 4 wt% DBS) changed the spherulitic morphologies and microstructures of PLLA. The formation of concentric-circled PLLA spherulites was due to the aggregation of DBS nanofibrils around the inside circles (or inside the spherulites). The concentric-circled spherulites were easily obtained at high DBS contents and high PLLA crystallization temperatures. However, at higher crystallization temperatures, the average diameter of the inside circles would exceed the final spherulite size of PLLA. Meanwhile, the DBS nanofibrils were mostly outside the spherulites. Therefore, the concentric-circled structures were not observed. Both the DBS content and PLLA crystallization temperature influenced the formation of concentric-circled spherulites. Moreover, PLLA crystallization temperatures seemed to have slightly larger effects. The crystallization temperature affected the nucleation and spherulite growth rate of PLLA, and thus altered the aggregation of DBS molecules and nanofibrils thereof. SAXS results indicated the long period of the PLLA samples was not significantly influenced by the formation of the concentric-circled spherulites. However, the maximum peak of PLLA broadened when DBS was added. The DBS nanofibrils influenced the regularity of PLLA lamellae, leading to the broader peak.
關鍵字
語言 en
ISSN 2046-2069
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度
國別 GBR
公開徵稿
出版型式 紙本
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