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Improvement of tensile properties, self-healing and recycle of thermoset styrene/2-vinylfuran copolymers via thermal triggered rearrangement of covalent crosslink
European Polymer Journal ( IF 5.8 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.eurpolymj.2017.12.040
Antonio Buonerba , Vito Speranza , Carmine Capacchione , Stefano Milione , Alfonso Grassi

Abstract Random copolymers of 2-vinylfuran with styrene (S-co-2VFs) have been thermoreversibly cross-linked via Diels-Alder (DA) reaction with 1,1′-(methylenedi-4,1-phenylene)bismaleimide (BMI), affording recyclable and self-healable polymers with enhanced mechanical properties. The reversibility of the DA reaction was investigated in detail by solution NMR and solid state FT-IR analysis. The thermal stability and reversibility of DA cycloadducts were studied by differential scanning calorimetry (DSC) in the range of temperature 100–150 °C. The in deep knowledge of the thermodynamic and kinetic parameters governing the DA reaction allowed to design an isothermal annealing (44 min at 140 °C) or programmed temperature ramp (30–150 °C) in which the full repair of fractured polymer films or of scratches on the film surface are successfully obtained. The temperature range in which the retro-DA reaction (r-DA) is active well matches the one of the healing process, highlighting the relationship between the reorganization of the polymer network and mendable properties. A method for the evaluation of the tensile properties of thin films at the nanoscale using nanomechanical analysis based on HarmoniX-Atomic Force Microscopy was proposed and validated by comparison with the bulk properties assessed by conventional tensile testing. This study highlights the potential of the 2-vinylfuran comonomer for the design of functional recyclable polymers, having thermoreversible crosslinks, self-healing properties and tunable enhanced mechanical properties.

中文翻译:

通过共价交联的热触发重排改善热固性苯乙烯/2-乙烯基呋喃共聚物的拉伸性能、自修复和回收利用

摘要 2-乙烯基呋喃与苯乙烯的无规共聚物(S-co-2VFs)通过狄尔斯-阿尔德(DA)反应与1,1'-(亚甲基二-4,1-亚苯基)双马来酰亚胺(BMI)发生热可逆交联,提供具有增强机械性能的可回收和自修复聚合物。通过溶液NMR和固态FT-IR分析详细研究了DA反应的可逆性。通过差示扫描量热法 (DSC) 在 100–150 °C 的温度范围内研究了 DA 环加合物的热稳定性和可逆性。对控制 DA 反应的热力学和动力学参数的深入了解允许设计等温退火(140°C 下 44 分钟)或程序升温(30-150°C),其中完全修复断裂的聚合物膜或成功获得了薄膜表面的划痕。逆向 DA 反应 (r-DA) 活跃的温度范围与修复过程之一很好地匹配,突出了聚合物网络的重组与可修复性能之间的关系。提出了一种使用基于 HarmoniX-原子力显微镜的纳米力学分析来评估纳米级薄膜拉伸性能的方法,并通过与常规拉伸测试评估的整体性能进行比较来验证。这项研究强调了 2-乙烯基呋喃共聚单体在设计功能性可回收聚合物方面的潜力,该聚合物具有热可逆交联、自修复性能和可调节的增强机械性能。强调了聚合物网络的重组与可修复性能之间的关系。提出了一种使用基于 HarmoniX-原子力显微镜的纳米力学分析来评估纳米级薄膜拉伸性能的方法,并通过与常规拉伸测试评估的整体性能进行比较来验证。这项研究强调了 2-乙烯基呋喃共聚单体在设计功能性可回收聚合物方面的潜力,该聚合物具有热可逆交联、自修复性能和可调节的增强机械性能。强调了聚合物网络的重组与可修复性能之间的关系。提出了一种使用基于 HarmoniX-原子力显微镜的纳米力学分析来评估纳米级薄膜拉伸性能的方法,并通过与常规拉伸测试评估的整体性能进行比较来验证。这项研究强调了 2-乙烯基呋喃共聚单体在设计功能性可回收聚合物方面的潜力,该聚合物具有热可逆交联、自修复性能和可调节的增强机械性能。提出了一种使用基于 HarmoniX-原子力显微镜的纳米力学分析来评估纳米级薄膜拉伸性能的方法,并通过与常规拉伸测试评估的整体性能进行比较来验证。这项研究强调了 2-乙烯基呋喃共聚单体在设计功能性可回收聚合物方面的潜力,该聚合物具有热可逆交联、自修复性能和可调节的增强机械性能。提出了一种使用基于 HarmoniX-原子力显微镜的纳米力学分析来评估纳米级薄膜拉伸性能的方法,并通过与常规拉伸测试评估的整体性能进行比较来验证。这项研究强调了 2-乙烯基呋喃共聚单体在设计功能性可回收聚合物方面的潜力,该聚合物具有热可逆交联、自修复性能和可调节的增强机械性能。
更新日期:2018-02-01
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