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Design of Dual Hybrid Network Natural Rubber–SiO2 Elastomers with Tailored Mechanical and Self-Healing Properties
ACS Omega ( IF 3.7 ) Pub Date : 2019-06-24 00:00:00 , DOI: 10.1021/acsomega.9b01243
Mohammad Abdul Sattar 1, 2 , Shyju Gangadharan 2 , Archita Patnaik 1
ACS Omega ( IF 3.7 ) Pub Date : 2019-06-24 00:00:00 , DOI: 10.1021/acsomega.9b01243
Mohammad Abdul Sattar 1, 2 , Shyju Gangadharan 2 , Archita Patnaik 1
Affiliation
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The preparation of natural rubber (NR)–silica (SiO2) elastomeric composites with excellent mechanical properties along with better self-healing ability remains a key challenge. Inspired by the energy dissipation and repairability of sacrificial bonds in biomaterials, a strategy for combining covalent and noncovalent sacrificial networks is engineered to construct a dual hybrid network. Here, the approach used to fabricate the composites was self-assembly of NR, bearing proteins and phospholipids on its outer bioshell, with SiO2 via metal-ion-mediated heteroaggregation effected by reversible electrostatic and H-bonds. Further, covalent cross-links were incorporated by a silane coupling agent, bis [3-(triethoxysilyl) propyl] tetrasulfide. The intrinsic self-healing ability of the composite at the molecular level was studied by broadband dielectric spectroscopy that unraveled the mechanism of the healing process. The synergistic effect between the molecular interdiffusion of the cross-linked NR chains and the electrostatic and H-bonding interactions imparted an exceptional self-healing characteristic to the liquid–liquid-mixing-prepared NR–SiO2 composites with improved mechanical performance. Specifically, the segmental relaxation dynamics of the healed composite was largely restricted due to increased number of ion–dipole interactions and S–S cross-links at the junction of the cut surface. We envisage that this extraordinary healing property, unreported yet, would be of great importance toward the design of novel NR–SiO2 elastomeric hybrids with superior mechanical properties.
中文翻译：
具有定制机械和自修复性能的双杂化网络天然橡胶-SiO2 弹性体的设计
制备具有优异机械性能和更好自修复能力的天然橡胶（NR）-二氧化硅（SiO 2 ）弹性复合材料仍然是一个关键挑战。受生物材料中牺牲键的能量耗散和可修复性的启发，设计了一种结合共价和非共价牺牲网络的策略来构建双混合网络。在这里，用于制造复合材料的方法是 NR 的自组装，其外部生物壳上带有蛋白质和磷脂，通过可逆静电和氢键影响的金属离子介导的异聚集与 SiO 2 。此外，通过硅烷偶联剂双[3-(三乙氧基甲硅烷基)丙基]四硫化物引入共价交联。通过宽带介电谱研究了复合材料在分子水平上的内在自修复能力，揭示了修复过程的机制。交联NR链的分子相互扩散与静电和氢键相互作用之间的协同效应赋予液-液混合制备的NR-SiO 2 复合材料优异的自修复特性，并改善了机械性能。具体来说，由于切割表面交界处离子偶极相互作用和 S-S 交联数量的增加，愈合复合材料的片段松弛动力学在很大程度上受到限制。我们预计，这种尚未报道的非凡愈合特性对于设计具有优异机械性能的新型 NR-SiO 2弹性体混合物非常重要。
更新日期：2019-06-24
中文翻译：
具有定制机械和自修复性能的双杂化网络天然橡胶-SiO2 弹性体的设计
制备具有优异机械性能和更好自修复能力的天然橡胶（NR）-二氧化硅（SiO 2 ）弹性复合材料仍然是一个关键挑战。受生物材料中牺牲键的能量耗散和可修复性的启发，设计了一种结合共价和非共价牺牲网络的策略来构建双混合网络。在这里，用于制造复合材料的方法是 NR 的自组装，其外部生物壳上带有蛋白质和磷脂，通过可逆静电和氢键影响的金属离子介导的异聚集与 SiO 2 。此外，通过硅烷偶联剂双[3-(三乙氧基甲硅烷基)丙基]四硫化物引入共价交联。通过宽带介电谱研究了复合材料在分子水平上的内在自修复能力，揭示了修复过程的机制。交联NR链的分子相互扩散与静电和氢键相互作用之间的协同效应赋予液-液混合制备的NR-SiO 2 复合材料优异的自修复特性，并改善了机械性能。具体来说，由于切割表面交界处离子偶极相互作用和 S-S 交联数量的增加，愈合复合材料的片段松弛动力学在很大程度上受到限制。我们预计，这种尚未报道的非凡愈合特性对于设计具有优异机械性能的新型 NR-SiO 2弹性体混合物非常重要。
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