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首页> 外文期刊>RSC Advances >Enhancement of the mechanical properties at the macro and nanoscale of thermosetting systems modified with a polystyrene-block-polymethyl methacrylate block copolymer
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Enhancement of the mechanical properties at the macro and nanoscale of thermosetting systems modified with a polystyrene-block-polymethyl methacrylate block copolymer

机译：用聚苯乙烯 - 嵌段 - 聚甲基甲基丙烯酸酯嵌段共聚物改性宏观和纳米热固性系统的机械性能的增强

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摘要

A diglycidyl ether of bisphenol A (DGEBA) epoxy monomer-based thermosetting system modified with a varying content of a polystyrene-block-polymethyl methacrylate (PS-b-PMMA) block copolymer and cured with a 4,4'-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA) curing agent was prepared by two different methods, without and with a solvent for the previous solution of the PS-b-PMMA block copolymer. The influence of the modifier content as well as the preparation method on the final properties of the PS-b-PMMA/(DGEBA-MCDEA) cured systems was investigated. DSC characterization confirmed the miscibility of the block copolymer with the thermoset matrix. Regardless of the preparation method, all analyzed thermosetting systems modified with PS-b-PMMA showed a nanostructured morphology, as confirmed by AFM measurement. The mechanical properties studied by a universal testing machine (MTS) at the macroscale were enhanced by the addition of the PS-b-PMMA block copolymer, especially in terms of the fracture toughness which improved considerably up to 25 wt% PS-b-PMMA content, although also the flexural modulus presented a slight increase with the modification with the PS-b-PMMA block copolymer. The quantitative nanomechanical (QNM) properties were studied at the nanoscale by AFM in PeakForce mode, and showed an improvement of the elastic modulus of the PMMA/(DGEBA-MCDEA) matrix up to 25 wt% PS-b-PMMA content. The QNM results allowed also the detection of a high difference between the elastic modulus values corresponding to the microseparated PS block rich phase and the PMMA/(DGEBA-MCDEA) matrix. A similar tendency was exhibited for both preparation methods, although the thermosetting systems prepared with the solvent reached slightly higher elastic moduli.
机译：双酚A（DGEBA）环氧单体的热固性热固性醚的二缩水甘油醚改性，其具有不同含量的聚苯乙烯 - 嵌段 - 聚甲基丙烯酸甲酯（PS-B-PMMA）嵌段共聚物，并用4,4'-甲基本发明固化（3-通过两种不同的方法制备氯-2,6-二乙基二乙基硅氧烷）（MCDEA）固化剂，无需且具有溶剂的PS-B-PMMA嵌段共聚物的溶剂。研究了改性剂含量以及制备方法对PS-B-PMMA /（DGEBA-MCDEA）固化系统的最终性质的影响。 DSC表征证实嵌段共聚物与热固性基质的混溶性。无论制备方法如何，用PS-B-PMMA改性的所有分析的热固性系统都显示出纳米结构形态，如AFM测量所证实。通过添加PS-B-PMMA嵌段共聚物，通过添加PS-B-PMMA嵌段共聚物来增强由通用试验机（MTS）研究的机械性能，尤其是在骨折韧性方面提高了25wt％PS-B-PMMA的裂缝韧性而言含量，虽然弯曲模量也随着PS-B-PMMA嵌段共聚物的改性而略有增加。在Peakforce模式下通过AFM在纳米级进行定量纳米机械（QNM）性能，并显示PMMA /（DGEBA-MCDEA）基质的弹性模量高达25wt％的PS-B-PMMA含量。 QNM结果还允许检测对应于微疏动的PS块富相位和PMMA /（DGEBA-MCDEA）矩阵对应的弹性模量值之间的高差异。对于两种制备方法表现出类似的趋势，尽管用溶剂制备的热固性系统达到略高的弹性模量。

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  • 来源
    《RSC Advances》 |2015年第123期|共11页
  • 作者

    Cano Laida; Gutierrez Junkal; Tercjak Agnieszka;

  • 作者单位

    Univ Basque Country UPV EHU Grp Mat Technol Chem Engn &

    Environm Dept Polytech Sch Donostia San Sebastian 20018 Spain;

    Univ Basque Country UPV EHU Grp Mat Technol Chem Engn &

    Environm Dept Polytech Sch Donostia San Sebastian 20018 Spain;

    Univ Basque Country UPV EHU Grp Mat Technol Chem Engn &

    Environm Dept Polytech Sch Donostia San Sebastian 20018 Spain;

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