用辐射方法制备PCL/玻璃纤维布和PCL/碳纤维布复合材料以及它们的生物降解性研究

PREPARATION OF PCL/GLASS FIBRE AND PCL/CARBON FIBRE COMPOSITES BY γ RAYS IRRADIATION AND THEIR BIODEGRADABILITY

观察了聚已内酯 (PCL) /玻璃纤维布和PCL/碳纤维布的机械性能的变化 ,通过对辐射交联的方法制备出了可生物降解聚合物涂覆纤维布复合材料。结果表明 ,γ辐射提高了复合材料的机械性能 ,这是由于所涂覆聚合物交联所产生的凝胶所致。在过冷态下通过γ射线照射 2 70kGy的PCL/玻璃纤维布复合材料的弯曲强度是未辐照样品的 1.5倍 ,弯曲模量提高到 1.35倍。通过酶降解试验和土埋法降解实验的研究 ,可以观察到降解导致了样品的失重。在酶降解试验中2 3h后 ,对于未交联材料涂覆的PCL完全降解掉 ,而交联样品中的PCL有 5 4%的失重发生。同样 ,在土埋法降解实验中 ,交联和未交联样品在一定的土埋时间后 ,也产生了样品的失重。未交联样品的失重率大于交联样品 ,这是由于交联样品所含有的交联网络结构阻碍它的降解。

A new biodegradable polymer coating fibre cloth composites has been achieved by γ rays irradiation in the present study. The mechanical properties (Bending Strength and Bending Modulus ) of poly (ε-caprolactone), PCL/carbon or glass fibre composites were investigated. γ rays irradiation improved the mechanical properties of composites due to the formation of gel by crosslinking. PCL/glass fibre cloth reinforced composites by irradiation at supercooled state in vacuum with increasing dose up to 270kGy, the composites gave higher bending strength of 1.5 times and bending modulus of 1.35 times compared with unirradiated composites. PCL in composites degraded by microorganisms in soil burial test and enzymatic degradation test. The degradation led to a weight loss. During enzymatic degradation test, after 23h immersion there were a 100% PCL weight loss for the unirradiated composite and 54% PCL weight loss for the irradiated composite. Weight loss of PCL gradually increases with increasing burial time. After 12 weeks in burial time, weight loss of 30% PCL was achieved for the uncrosslinked composite, while, for crosslinked composite (gel content 69%), weight loss of 20% was achieved.