Preparation and Characterization of Surface-Modified β-Tricalcium Phosphate/Ploy(L-Lactide) Biocomposites

Abstract:

A new surface modification method by modifying low molecular weight ploy (L-lactide) (LMW PLLA) onto the β-tricalcium phosphate (β-TCP) superfine particles has been developed. The surface-modified β-TCP is characterized by FT-IR, XRD, digital microscope and contact angle measurement, et al. FT-IR spectra confirmed that LMW PLLA was connected onto the β-TCP surface through ionic interaction. XRD results indicated that the LMW PLLA did not affect the crystalline form of β-TCP, but the XRD patterns of the p-β-TCP showed a little difference with β-TCP. The p-β-TCP particles could be dispersed uniformly in dichloromethane. In contrast, unmodified β-TCP particles are apt to agglomerate after dispersed into dichloromethane. Wet angle measurement showed that hydrolyzed LMW PLLA significantly improves hydrophobicity of modified β-TCP particles. For the preparation of composites, PLLA was mixed with β-TCP and p-β-TCP, respectively, in a ratio of 85/15 (w/w) and moulded into tensile test specimens. Tensile tests showed that mechanical properties were improved, scanning electron microscopy (SEM) exhibited that modified β-TCP is an effective approach to prepare a homogeneous composites, moreover, it indicated a better interfacial phase interaction in the composite with the p-β-TCP. Chemical bonds between filler and PLLA matrix are assumed to be formed by ionic interaction.

• Periodical: Advanced Materials Research (Volumes 197-198)
• Pages: 120-126
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.197-198.120
• Online since: February 2011
• Authors: Jun Zou, Xu Bin Jiang, Jing Zhang, You Shu, Xuan Chen, Fa Rong Huang
• Keywords: Hydrolyzed, Poly(L-Lactide), Surface-Modified, β-Tricalcium Phosphate

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