采用二甲基亚砜为溶剂配制不同质量分数的聚偏氟乙烯溶液,用HAAKE RS150锥板式黏度计测量了溶液的流变性.研究了不同质量分数溶液的流变曲线,零切黏度与质量分数的关系以及黏度主曲线.结果显示,在低切变速率下,表观黏度随切变速率的增加而缓慢地下降,当切变速率到达一临界点时,随切变速率的增加,表观黏度快速下降,表现为强的切变速率依赖性.根据零切黏度与质量分数的关系,求出了零切黏度与质量分数的关系式.溶液的黏度主曲线显示,在较高的切变速率下曲线的斜率符合Graessley理论的计算值.
参考文献
| [1] | Graessley W W;Segal L .Flow behavior of polystyrene systems in steady shear flow[J].Macromolecules,1969,2:49-57. |
| [2] | Ferry J D.Viscoelastic Properties of Polymers[M].New York:wiley,1980 |
| [3] | Forsman W C.Polymers in Solution[M].New York:Plenum,1986 |
| [4] | Graessley W W .Viscosity of entangling polydisperse polymers[J].Journal of Chemical Physics,1967,47:1942-1953. |
| [5] | Fox T G;Loshack S .Isothermal viscosity-molecular weight dependence for long polymer chains[J].Journal of Applied Physics,1955,26:1080-1082. |
| [6] | Gupta D;Forsman W C .Newtonian viscosity-molecular weight relationship for concentrated solutions of monodisperse polystyrene[J].Macromolecules,1969,2:304-306. |
| [7] | Graessley W W .Molecular entanglement theory of flow behavior in amorphous polymers[J].The J Chem Phy,1965,43:2696-2702. |
| [8] | Stratton R A .The dependence of non-Newtonian viscosity on molecular weight for monodisperse polystyrene[J].J Colloid and Polym Sci,1966,22:517-530. |
| [9] | Graessley W W .Linear viscoelasticity in entangling polymer systems[J].Journal of Chemical Physics,1971,54(12):5143-5157. |
| [10] | Dewitt T W;Uarkovitz H;Padden F J et al.Concentration dependence of the rheological behavior of the polyisobutylene-decalin system[J].Journal of Colloid Science,1955,10:174-188. |
| [11] | Osaki K;Kim B;Kurata M .Rheology of copolymer solution(Ⅲ),The linear viscoelasticity of SBS block copolymer solutions[J].Polymer Journal,1978,10:353-363. |
| [12] | Berry G C;Hager B L;Wong C P .Rheological studies on concentrated solutions of the poly(α-methylstyrene)[J].Macromolecules,1977,10:361-365. |
| [13] | Rouse P E Jr .A theory of the linear viscoelastic properties of dilute solutions of coiling polymers[J].Journal of Chemical Physics,1953,21:1272-1280. |
| [14] | Bohdanecky M;Kovar J.Viscosity of polymer solutions[M].New York:Elsevier Sciemific Publishing Company,1982 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%