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Fabrication of Poly-(DL-Lactic Acid)—Wollastonite Composite Films with Surface Modified β-CaSiO 3 Particles

2007; SAGE Publishing; Volume: 22; Issue: 5 Linguagem: Inglês

10.1177/0885328207079670

1530-8022

Lingzhi Ye, Jiang Chang, Congqin Ning, Kaili Lin,

Dental materials and restorations

Bioactive poly-(DL-lactic acid) (PDLLA)—wollastonite composite films are successfully fabricated using surface modified wollastonite (mβ-CaSiO 3 ) particles through solvent casting-evaporation method. The surface modification of β-CaSiO 3 particles are conducted by reaction of the ceramic particles with dodecyl alcohol. Surface morphology, tensile strength, and bioactivity of the composite films are investigated. The results show that the particle distribution and tensile strength of the composite films with modified β-CaSiO 3 particles are significantly improved while the bioactivity is retained. As a result, the maximum tensile strength is enhanced 52.2% when compared with the PDLLA—β-CaSiO 3 composite films prepared using unmodified β-CaSiO 3 particles when the inorganic filler content is 15wt%. Scanning electron microscopy (SEM) observation suggests that the modified mβ-CaSiO 3 particles are homogeneously dispersed in the PDLLA matrix. The bioactivity of the composite films is evaluated by soaking in a simulated body fluid (SBF) and the result suggests that the modified composite film is still bioactive and can induce the formation of HAp on its surface after the immersion in SBF, despite the bonded dodecyl alkyl on the surface of the inorganic particles. All these results imply that the surface modification of β-CaSiO 3 with dodecyl alcohol is an effective approach to prepare PDLLA—β-CaSiO 3 composite with improved properties.