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Morphology and Properties of Poly(L-Lactide) (PLLA) Filled with Hollow Glass Beads

✍ Scribed by Xiao Hu; Hong-Sheng Xu; Zhong-Ming Li

Book ID
102484532
Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
294 KB
Volume
292
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

The morphology, crystalline behavior, and mechanical and thermal properties of poly(L‐lactide)/hollow glass beads (PLLA/HGBs) composites were investigated. The incorporation of HGBs enhanced the crystallization rate and crystallinity of PLLA, but slightly decreased its elongation at break. In addition, HGBs acted as stress concentration points inducing the plastic deformation of PLLA, leading to increased Izod impact strength. Differential scanning calorimetry results show that annealed PLLA eliminated cold crystallization phenomenon in the region of 100–140 °C and presented a double melting peak around 150 °C. Moreover, annealing was demonstrated to be effective for the improvement of tensile modulus, strength, Izod impact strength and heat distortion temperature of the composites due to the increased crystallinity and more perfect crystals. Silane coupling agents can enhance the interfacial adhesion of the composites, and lead to better mechanical properties. Compared to neat PLLA, the HGBs filled PLLA composites did not exhibit an obvious increase of the density.

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