热塑性聚氨酯复合材料薄膜的制备及其性能研究

利用纵向氧化切割多层碳纳米管（MWCNTs）制得氧化石墨烯纳米带碳纳米管（GONRs-CNTs）2种维度纳米杂化材料，用异氰酸苯酯对GONRs(67 %)-CNTs纳米杂化体进行表面化学修饰制得功能化GONRs(67 %)-CNTs（pGONRs-CNTs，GONRs质量分数为67 %），探究了pGONRs-CNTs对热塑性聚氨酯（TPU）薄膜阻隔、力学和降解性能的影响。结果表明，改性后所得pGONRs-CNTs杂化体表面变得模糊而粗糙，亲油性得到明显提高，有利于其在聚合物基体中实现均匀稳固分布。当pGONRs-CNTs含量为0.5 %（质量分数，下同）时，TPU/pGONRs-CNTs材料相比纯TPU材料的氧气透过率（OTR）低63.08 %，拉伸强度高46.55 %，其对应的阻透性能与力学性能均有较大程度提高；而且，由于pGONRs-CNTs物质的使用，使TPU材料的使用寿命延长。

Study on Fabrication and Performance of TPU Composite Films

A novel method was adopted to modify TPU with the nanohybrids consisting of two-dimensional graphene oxide nanoribbons (GONRs) and one-dimensional carbon nanotubes (CNTs). The GONRs-CNTs nanohybrids were obtained with a weight fraction of GONRs of 67 wt % through oxidative longitudinal unzipping for MWCNTs, followed by a modification with phenyl isocyanate. The functionalized GONRs-CNTs (pGONRs-CNTs)/TPU composite films were then prepared by a solution coating method using a coating machine. The effect of pGONRs-CNTs content on the barrier, tensile and degradation properties of the composite films was investigated. The results indicated that pGONRs-CNTs were well dispersed in the TPU matrix with a neat shape and low defect due to its strong interfacial adhesion with TPU. When 0.5 wt % of pGONRs-CNTs was incorporated into TPU, the composite films achieved the optimium barrier and tensile properties, in which the oxygen transmission rate decreased by 63.08 % and the tensile strength increased by 46.55 % compared to those of pure TPU film. In addition, the addition of pGONRs-CNTs also improved the serving time of the composite films.