高分子特性粘度的普适性理论

来源 :中国化学会第29届学术年会 | 被引量 : 0次 | 上传用户:yuekinger
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  高分子特性粘度理论是高分子链拓扑结构表征和分子量测定的理论基础。然而,广泛被接受的特性粘度经验公式和理论都没有从流体动力学的角度去理解和阐释特性粘度的本质,即:高分子链节之间、链节与溶剂之间的屏蔽与长程累积等流体力学相互作用以及链节本身尺寸等问题。为了解决这些高分子物理学难题,我们基于高分子链部分穿透球模型;引入了平均场框架下的携水函数ξ(r)和泄水函数 κ(r),克服了Wiegel理论的局域密度-渗透率函数无法考虑长程累积效应和Kirkwood-Riseman理论或Zimm理论无法考虑链节尺寸和多体相互作用的不足,有效地处理了高分子链节间的多体流体力学相互作用和长程累积效应;结合Einstein扰动耗散理论和Debye转动耗散理论,基于第一性原理,首次严格推导了能够描述任意拓扑结构高分子链特性粘度的普适性理论计算公式。我们的理论能够定量地预测线形、环形、星形、支化、超支化和树枝形等不同拓扑结构高分子的特性粘度行为,并得到了大量实验数据的强有力验证。
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