氧化石墨烯、石墨/明胶复合膜的力学性能和热稳定性

Mechanical Properties and Thermal Stability of Graphene Oxide (GO) and Graphite/Gelatin Composite Membranes

摘要:

以明胶为基体，甘油为增塑剂，石墨和氧化石墨烯(graphene oxide，GO)分别作为增强相，制备出一系列两种增强相的共混复合膜，探究两者与基体明胶的相容性，并通过测试复合膜的抗拉强度、断裂伸长率、热缩、SEM和透光率，用于研究不同的增强相复合膜性能及规律。结果表明：0.5% GO复合膜的抗拉强度（17.98 MPa）最大，比空白样（11.74 MPa）增加53.4%，10%石墨复合膜的断裂伸长率（57.30%）最大，比空白样（22.65%）增加153%；通过不同复合膜的SEM观察得出GO与基体的相容性优于石墨；5%的石墨含量热缩率最小，比空白样减小27%，但石墨复合膜的热缩率下降趋势比GO复合膜的下降趋势波动性大；随着GO和石墨含量的增大，透光率逐渐的降低，雾度逐渐增大。通过两者的对比得出：GO与明胶结合较好，两者相互结合成键，使得分子间作用力增强，结构稳定；石墨与明胶结合相容性不好，但石墨对基体明胶的保护较好。

Abstract:

Graphene oxide and graphite/gelatin composite membranes were prepared by blending method. Tensile strength, elongation at break, heat shrinkage, SEM and light transmittance were used to characterize the prepared samples. The results indicated that the sample membrane of 5% graphene oxide tensile strength (17.98 MPa) was best, which increased by 53.4% compared with 0% sample membrane tensile strength (11.74 MPa). The sample membrane of 10% graphite elongation at break (57.3%) was best, which increased by 153% compared with 0% sample membrane elongation at break (22.65%). The compatibility of matrix GO was better than that of graphite by SEM. The thermal shrinkage at 5% graphite was smallest, which reduced by 27% compared with 0% sample membrane. The thermal shrinkage reduction tendency of graphite composite membrane was larger than that of GO composite membrane. With contents of GO and graphite increased, the light transmittance decreased and the haze increased. By comparing GO and graphite composite membranes, the GO had good binding with gelatin, molecular force was strong, and structure was stable. The graphite and gelatin had bad compatibility than GO and gelatin. But graphite had good protection on gelatin.