硅灰石表面接枝聚合DL-乳酸的研究

STUDIES ON GRAFTING POLYMERIZATION OF DL-LACTIDE ON THE SURFACE OF WOLLASTONITE PARTICLES

研究了一种在硅灰石粒子表面开环聚合嫁接外消旋乳酸的新方法,将外消旋聚乳酸通过化学键直接连接到硅灰石表面。聚乳酸接枝的硅灰石颗粒在乙醇等有机溶剂中分散性更好,可以稳定数天。傅立叶变换红外光谱证实了硅灰石表面成功引入了聚乳酸分子。聚乳酸在硅灰石粒子表面的最大接枝率约为5.8%。聚乳酸/乳酸接枝改性硅灰石复合材料的拉伸强度和弯曲强度比未接枝的复合材料均有所提高,组分中含有10%无机粒子复合材料的拉伸强度为58.9 MPa,含15%无机粒子复合材料的弯曲强度为96.3 MPa。

A novel method of grafting ring-opening polymerization ofDL-lactide （ DLLA ）onto the surface of wollastonite particles was developed. PDLLA was directly connected onto the wollastonite surface through a chemical linkage. The PDLLA-g- wollastonite particles could be stably dispersed in organic solvent such as ethanol for several days. Fourier transformation infrared （ FTIR ）spectra confirmed the existence of PDLLA on the surface of PDLLA-g-wollastonite. The maximum graft degree of PDLLA on the wollastonite paticles determined by the weight method was about 5.8%. The mechanical properties of the PDLLA/PDLLA- g-wollastonite composites had improved some. The tensile strength of the composite containing 10 wt% of PDLLA-g-wollastonite was 58.9 Moa, and the bending strength of the composite containing 15 wt% of PDLLA-g-wollastonite was 96.3 MPa.