改性双羟基氧化物对P(BA-VAc)力学性能及热性能的影响

Effect of Organic Modified Layered Double Hydroxide on the Mechanical and Thermal Properties of Poly(Butyl Acrylate-Vinyl Acetate)

采用共沉淀法制备了十二烷基硫酸钠改性双羟基氧化物(SDS-LDH),并借助红外光谱(FT-IR)和X射线衍射(XRD)对SDS-LDH进行了结构表征。通过原位聚合法制备了聚(丙烯酸丁酯-醋酸乙烯酯)(P(BA-VAc))/SDS-LDH复合胶膜,详细探讨了SDS-LDH用量对P(BA-VAc)力学性能、热性能以及抗氧化能力的影响。结果表明,m(SDS-LDH)/m(P(BA-VAc))为0.1/100-1.0/100内,共聚胶膜拉伸强度逐渐增大,断裂伸长率在m(SDS-LDH)/m(P(BA-VAc))=0.3/100时达到最佳值而后逐渐减小;SDS-LDH参与了P(BA-VAc)大分子热降解过程,使胶膜初始分解温度提高11.6℃;m(SDS-LDH)/m(P(BA-VAc))=0.1/100的SDS-LDH即可大幅度提高胶膜的抗氧化能力。

The sodium dodecyl sulfate modified layered double hydroxide （SDS-LDH） was successfully synthesized via co-precipitation method and characterized by FT-IR and XRD. Poly （butyl acrylate-vinyl acetate） （P （BA- VAc））/SDS-LDH composites were prepared via in-situ emulsion polymerization. The effect of SDS-LDH on the properties of P（BA-VAc）, such as mechanical, thermal degradation and anti-thermal oxidation properties, were detected carefully. The results demonstrate that the tensile strength increases with the increase of SDS-LDH loading when m （SDS-LDH）/m （P（BA＋ VAc））= 0.1/100-1. 0/100 SDS-LDH loading. The elongation at break reaches the maximum value with m （SDS-LDH）/m （P（BA ＋ VAc）） = 0.3/100, and then decreases slowly. SDS-LDH took part in the thermal degradation reaction of P （BA-VAc）, based on which the initial degradation temperature is enhanced by 11.6 ℃. The anti thermal oxidation property P（BA-VAc）/SDS-LDH is improved severely even with only m （SDS-LDH）/m （P（BA ＋ VAc）） = 0.1/100.