原位聚甲基丙烯酸甲酯在加成型硅橡胶中的作用，具体涉及粘合和阻尼性能,Journal of Applied Polymer Science

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原位聚甲基丙烯酸甲酯在加成型硅橡胶中的作用，具体涉及粘合和阻尼性能
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-11-07 , DOI: 10.1002/app.50252
Bin Huang _{1,

2} , Lina Dai ₁ , Ziqi Chen _{1,

2} , Yan Zhao _{1,

2} , Xiyin Gao ₁ , Qian Wang ₁ , Zemin Xie ₁ , Zhijie Zhang _{1,

2}

Affiliation

在此，提出了一种在聚二甲基硅氧烷（PDMS）网络中嵌入原位聚甲基丙烯酸甲酯（PMMA）域的策略，以增强加成型硅橡胶（SR）的粘合力和阻尼性能。根据格里菲斯（Griffith）准则，PMMA域可改善SR的模量（在室温下），该模量与其粘合性能之间的相关性更强。此外，热塑性PMMA的玻璃化转变可提供高温下的阻尼性能。PMMA / SR共混物是通过PMMA和乙烯基封端的聚二甲基硅氧烷（vi-PDMS）液体共混物与聚甲基氢硅氧烷的交联而获得的，而PMMA / vi-PDMS液体共混物是通过甲基丙烯酸甲酯（MMA）的原位自由基聚合制备的）在以甲苯为增容剂的vi-PDMS中。分散速度，相容剂含量，研究了PMMA比例对PMMA / SR共混物的形貌和性能的影响。在适当的分散速度（100-300 rpm）和丰富的增容剂含量（〜100 wt％指vi-PDMS）下，在窄尺寸分布和良好分散的PMMA / vi-PDMS共混物中形成小的PMMA域（约800 nm）。具有20 wt％PMMA的混合物对不锈钢的拉伸强度超过8 MPa，搭接剪切强度超过5 MPa。含有50 wt％PMMA的混合物显示出良好的棕褐色阻尼性能具有20 wt％PMMA的共混物对不锈钢的抗拉强度超过8 MPa，搭接剪切强度超过5 MPa。含有50 wt％PMMA的混合物显示出良好的棕褐色阻尼性能具有20 wt％PMMA的混合物对不锈钢的拉伸强度超过8 MPa，搭接剪切强度超过5 MPa。含有50 wt％PMMA的混合物显示出良好的棕褐色阻尼性能在-50至150°C的温度范围内，δ超过0.15。T _g ‐PMMA略微移至较低温度，且嵌入的PMMA较少，但T _g ‐PDMS相对保持相对稳定。

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Role of in‐situ polymethyl‐methacrylate in addition type silicone rubber with specific reference to adhesion and damping properties

Herein, a strategy of embedding in‐situ polymethyl‐methacrylate (PMMA) domains in polydimethylsiloxane (PDMS) networks is proposed to enhance adhesive and damping properties of addition type silicone rubber (SR). PMMA domains improve the modulus of SR (at room temperature), which is stronger correlated to its adhesive performance, according to the Griffith criterion. Besides, the damping performance at high temperature is provided by the glass transition of thermoplastic PMMA. The PMMA/SR blends are obtained by the crosslink of PMMA and vinyl‐terminated polydimethylsiloxane (vi‐PDMS) liquid blends with polymethylhydrosiloxane, and the PMMA/vi‐PDMS liquid blends are prepared by in‐situ radical polymerization of methyl‐methacrylate (MMA) in vi‐PDMS with toluene as compatibilizer. Effects of disperse speed, compatibilizer content, and PMMA proportion on the morphologies and properties of PMMA/SR blends are studied. Small PMMA domains (around 800 nm) in PMMA/vi‐PDMS blends with narrow size distribution and well dispersion are formed at appropriate disperse speed (100–300 rpm) and abundant compatibilizer content (~100 wt% refers to vi‐PDMS). The blends with 20 wt% PMMA possess tensile strength over 8 MPa and lap shear strength over 5 MPa to stainless steel. And the blends with 50 wt% PMMA show good damping properties with tan δ over 0.15 at temperature range from −50 to 150°C. T_g‐PMMA moves slightly to lower temperature with less PMMA embedded, but T_g‐PDMS remained stable relatively.

更新日期：2020-11-07

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