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APS -APS March Meeting 2017 - Event - Thermodynamic control of star polymer architecture.

机译:APS -APS 2017年3月会议-活动-星形聚合物结构的热力学控制。

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Star polymers differ from linear chains due to steric interactions between the arms. These steric interactions have not been previously quantified. This presentation will report on the extent that star arms are straightened under variable temperature and solvent as well as star functionality. The second virial coefficient is directly measured for the stars. The topological consequences of variable solvation are quantified using dilute solution neutron scattering and a hybrid unified scattering function coupled with the RPA equation. The results contradict the predictions of the Daoud-Cotton model and reflect a new uniform fractal model for star polymers at low functionality below about 8 arms. A transition to Daoud-Cotton behavior might be anticipated for high functionality stars and dendrimers.
机译:由于臂之间的空间相互作用,星形聚合物不同于线性链。这些空间相互作用以前没有被量化过。本演讲将报告星形臂在可变温度和溶剂以及星形功能下的矫直程度。第二维里系数是直接测量恒星的。使用稀溶液中子散射和结合RPA方程的混合统一散射函数来量化可变溶剂化的拓扑结果。结果与Daoud-Cotton模型的预测相矛盾,并且反映了星空聚合物在低于约8个臂的低官能度下的新均匀分形模型。对于高官能度的恒星和树枝状大分子,可能会过渡到Daoud-Cotton行为。

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