Effect of silica nanoparticle filler on microscopic polymer α-relaxation dynamics
Effect of silica nanoparticle filler on microscopic polymer α-relaxation dynamics
复制标题
二氧化硅纳米粒子填料对微观聚合物α-弛豫动力学的影响
DOI：
10.1007/s10751-017-1466-y
复制
发表时间：
2017
影响因子：
--
通讯作者：
Seto Makoto
中科院分区：
文献类型：
--
作者：
Saito Makina;Mashita Ryo;Kishimoto Hiroyuki;Masuda Ryo;Yoda Yoshitaka;Seto Makoto
轮胎橡胶不断发展以提高其性能，但这些改进背后的微观机制，例如通过在橡胶中添加纳米颗粒，目前尚未完全了解。我们通过使用伽马射线时域干涉仪的准弹性散射实验研究了由聚合物聚丁二烯和 20％体积的直径为 100 nm 的二氧化硅纳米颗粒组成的橡胶纳米复合材料系统的微观聚合物动力学。结果表明，二氧化硅纳米粒子的存在导致链间α-弛豫动力学在浅过冷状态下减慢，这表明与聚合物接触的纳米粒子的存在控制了聚合物α-弛豫动力学的时间尺度。相反，纳米颗粒的存在对 Tg 附近较低温度区域的动力学影响较小。这与差示扫描量热法研究的结果一致，显示纯聚合物和纳米复合材料体系之间的Tg差异可以忽略不计。它还表明，准弹性散射实验可用于揭示纳米复合材料中的聚合物动力学，并且适合表征其微观动力学以改善轮胎性能。
Tyre rubber has been continuously developed to improve its performance, but the microscopic mechanisms behind these improvements, e.g. by adding nanoparticles to the rubber, are still not fully understood. We study the microscopic polymer dynamics of a rubber nanocomposite system consisting of polymer polybutadiene with 20 volume% of silica nanoparticles with diameters of 100 nm via quasi-elastic scattering experiments using gamma-ray time-domain interferometry. The result shows that the presence of silica nanoparticles caused the inter-chainα-relaxation dynamics to slow down in a shallowly supercooled state suggesting that the presence of the nanoparticles that came in contact with the polymer controlled the timescale of the polymer’sα-relaxation dynamics. Conversely, the presence of nanoparticles less affects the dynamics in a lower temperature region nearTg. It is consistent with the result of the differential scanning calorimetry study showing negligibleTgdifference among the pure polymer and the nanocomposite system. It also shows that the quasi-elastic scattering experiment can be used to reveal the polymer dynamics in nanocomposites and is appropriate for characterising their microscopic dynamics for the purpose of improving tyre performance.