Diffusivity and Viscosity of Concentrated Hydrogenated Polybutadiene Solutions
Diffusivity and Viscosity of Concentrated Hydrogenated Polybutadiene Solutions
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DOI：
10.1021/ma991983r
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发表时间：
2000-02
期刊：
影响因子：
5.5
通讯作者：
Hui Tao and;T. Lodge;E. V. Meerwall
中科院分区：
文献类型：
--
作者：
Hui Tao and;T. Lodge;E. V. Meerwall
本文报道了氢化聚丁二烯（hPB）/烷烃溶液的扩散（D）和粘度（η）的测量结果。体积分数（φ）从0.20一直延伸到熔体，分子量（M）从4900一直延伸到440 000;每条链的缠结数（M/Me）范围高达约450。D和η的温度依赖性相似，与文献值一致，且与φ和M无关。因此，我们得出结论，单体摩擦因子也与φ和M无关。对于M/Me ≥ 3的所有样品，数据符合标度关系D <$M-2.4±0.1φ-1.8 <$0.2和η <$M 3.4 ±0.1φ3.8±0.2;在数据的精度范围内，M指数不依赖于φ，φ指数不依赖于M。溶液中D的M指数与先前报道的φ ≤ 0.4的研究一致，但显然与熔体中的蠕动值-2.0相矛盾。然而，通过与文献中的hPB和其他六种聚合物的熔体自扩散数据的比较，很明显，e.g.
We report measurements of diffusion (D) and viscosity (η) in hydrogenated polybutadiene (hPB)/alkane solutions. The volume fractions (φ) extend from 0.20 up to the melt and the molecular weights (M) from 4900 up to 440 000; the number of entanglements per chain, M/Me, ranges up to about 450. The temperature dependences of both D and η are similar, consistent with literature values, and independent of φ and M. We thus conclude that the monomeric friction factor is also independent of φ and M. For all samples with M/Me ≥ 3 the data are consistent with the scaling relations D ∼ M-2.4±0.1φ-1.8±0.2 and η ∼ M3.4±0.1φ3.8±0.2; within the precision of the data the M exponents do not depend on φ, and the φ exponents do not depend on M. The M exponent for D in solution is consistent with previously reported studies for φ ≤ 0.4 but apparently conflicts with the reptation value of −2.0 in the melt. However, by comparing with the literature melt self-diffusion data for hPB and six other polymers, it is clear that the e...