SDBS对核壳结构木塑复合材料抗静电及热力学性能的影响

Effect of SDBS on the Antistatic and Thermodynamic Properties of Core Shell Structure Wood Plastic Composites

以十二烷基苯磺酸钠(SDBS)为抗静电剂,将其加入到具有核壳结构的高密度聚乙烯(HDPE)木塑复合材料中,以减小壳层HDPE的静电效应。采用超高电阻测量仪、万能力学试验机、表面接触角测试仪以及差示扫描量热仪对样品进行电学、力学、表面润湿性以及热力学分析。结果表明:未添加SDBS的核壳结构木塑复合材料的表面电阻率为10^(15)Ω;添加18%的SDBS后,木塑复合材料的表面电阻率降至10~8Ω。添加SDBS后,木塑复合材料的力学性能先上升后下降,弯曲强度较最高值下降约3.67%,弯曲模量较最高值下降约9.92%,冲击强度较最高值下降约10.20%。复合材料表面润湿性随着壳层SDBS含量的增加而降低,壳层结构HDPE基体结晶度则先降低后提高。

Sodium dodecyl benzene sulfonate（SDBS）, as a type of antistatic agents, was incorporated into the shell layer of the wood-plastic composite（WPC） with core-shell structure, so as to reduce the electrostatic effect of high density polyethylene（HDPE）. The electrical, mechanical, surface wettability and thermodynamic properties were investigated with ultrahigh resistance meter, universal mechanical testing machine, surface contact angle tester and differential scanning calorimeter, respectively. The results show that： the surface resistivity of the WPC with coreshell structure without SDBS reaches to 10^（15） Ω. When the content of SDBS is 18%, the surface resistivity drops to 10~8 Ω. With the addition of SDBS, the mechanical properties of WPC begin to rise and then decrease, the bending strength decreases by about 3.67%, the flexural modulus decreases by about 9.92%, and the impact strength decreases by about 10.20%. The wettability of the composite surface decreases with the increase of the content of SDBS in the shell, and the crystallinity of the shell structure HDPE decreases at first and then increases.