【摘要】 以热塑性聚氨酯(TPU)为基体、以经聚乙烯醇(PVA)功能化接枝改性的氧化石墨烯(Graphene Oxide)为填料,用熔融共混法制备GO-g-PVA/TPU复合材料,使用FTIR,DSC,DMA和拉伸性能测试等手段表征了填料和复合材料的结构与性能。结果表明,加入GO-g-PVA提高了TPU的结晶温度,当GO-g-PVA含量(质量分数,下同)为4%时GO-g-PVA/TPU的结晶峰温度比纯TPU提高了28.8℃。当GO-g-PVA的含量超过1%后GO-g-PVA/TPU复合材料的定伸应力随着GO-g-PVA含量的增而增大,表明GO-g-PVA的加入改善了TPU的拉伸性能。GO-g-PVA的加入显著改善了复合材料的储能模量与损耗模量,提高了形状固定率(Rf)。GO-g-PVA含量为4%时Rf为87.5%,比纯TPU提高了20%;随着GO-g-PVA的加入50℃时GO-g-PVA/TPU复合材料的形状回复率(R_r)呈下降趋势,但是在较高温度下比较低温度有更高的R_r值。更多还原

【Abstract】 Composites of GO-g-PVA/TPU were prepared by using polyvinyl alcohol(PVA) grafted graphene oxide as filler and thermoplastic polyurethane(TPU) as matrix by melt blending method. The structure and properties of the resultant composites were characterized by means of FTIR, DSC, DMA and tensile tests. DSC tests show that the addition of GO-g-PVA increased the crystallization temperature of the composites. When the content(mass fraction%) of GO-g-PVA was 4%, the crystallization temperature of GO-g-PVA/TPU increased by 28.8℃ in contrast to that of the plain TPU. Tensile tests show that the modulus of GO-g-PVA/TPU composites increased with the increasing filler content when the content of GO-g-PVA was higher than 1%. DMA analysis indicated that GO-g-PVA enhanced the storage modulus and loss modulus of GO-g-PVA/TPU composites. Shape memory properties results show that the addition of GO-g-PVA significantly improved the shape fixed rate(Rf) of the composites. When the content of GO-g-PVA was 4%, the Rfof the composite was 87.5%, which increased by 20% compared with that of pure TPU. However, with the increasing amount of GO-g-PVA the shape recovery ratio(R_r)) of the composite decreased generally at 50℃, and the composites showed higher R_r)value at high temperature rather than at low temperature.更多还原