Tuning the Mechanical Properties of Poly(Methyl Acrylate) via Surface‐Functionalized Montmorillonite Nanosheets,Macromolecular Materials and Engineering

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Tuning the Mechanical Properties of Poly(Methyl Acrylate) via Surface‐Functionalized Montmorillonite Nanosheets
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-11-18 , DOI: 10.1002/mame.202000595
Judith Elisabeth Rauschendorfer ₁ , Katharina Maria Thien ₁ , Manuela Denz ₂ , Sarah Köster ₂ , Florian Ehlers ₁ , Philipp Vana ₁

Affiliation

Polymer layered silicate nanocomposites (PLSNs) made of montmorillonite (MMT) nanosheets and poly(methyl acrylate) (PMA) are synthesized and systematically characterized. MMT is first modified with a surface‐bound monomer and then functionalized with PMA via radical addition–fragmentation chain transfer (RAFT) polymerization using a grafting through approach. PMA‐modified MMT nanosheets with grafted polymer chains of variable length are obtained. The successful surface modification is demonstrated by near‐field scanning optical microscopy, thermogravimetric analysis, attenuated total reflection Fourier transform infrared spectroscopy, small‐angle X‐ray scattering, and size‐exclusion chromatography. The mechanical properties of various nanocomposites are evaluated via tensile testing. It can be shown that the mechanical properties (Young's modulus, tensile strength, toughness, and ductility) of these PLSNs can be fully controlled by using two major strategies, i.e., by the variation of the overall content of polymer‐modified MMT and by the variation of the chain length of the surface‐grafted polymer.

中文翻译：

通过表面功能化蒙脱土纳米片调节聚丙烯酸甲酯的机械性能

合成了蒙脱土（MMT）纳米片和聚丙烯酸甲酯（PMA）制成的聚合物层状硅酸盐纳米复合材料（PLSN）。首先用表面结合的单体对MMT进行改性，然后通过自由基加成-断裂链转移（RAFT）聚合，使用接枝反应，通过PMA进行功能化方法。获得了具有可变长度的接枝聚合物链的PMA改性MMT纳米片。近场扫描光学显微镜，热重分析，衰减全反射傅立叶变换红外光谱，小角度X射线散射和尺寸排阻色谱法证明了成功的表面改性。通过拉伸测试评估各种纳米复合材料的机械性能。可以证明，可以通过两种主要策略来完全控制这些PLSN的机械性能（杨氏模量，拉伸强度，韧性和延展性），即通过改变聚合物改性MMT的总含量和表面接枝聚合物链长的变化。

更新日期：2020-11-18

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