Effect of branch structure on rheological properties of dendritic polymer before and after shearing

doi:10.16085/j.issn.1000-6613.019-1682

Chemical Industry and Engineering Progress ›› 2020, Vol. 39 ›› Issue (8): 3183-3196.DOI: 10.16085/j.issn.1000-6613.019-1682

• Materials science and technology • Previous Articles Next Articles

Effect of branch structure on rheological properties of dendritic polymer before and after shearing

Nanjun LAI¹^,²^,³(), Xiaohu WEN¹, Wensen ZHAO⁴, Yong WANG⁵, Xubin ZHAO⁵, Dan ZHOU⁵

^1.College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China
^2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology，Chengdu 610059, Sichuan, China
^3.State Key Laboratory of Polymer Molecular Engineering, Fudan University, Shanghai 200438, China
^4.CNOOC Research Institute Co. , Ltd. , Beijing 100028, China
^5.PetroChina Xinjiang Oilfield Branch Baikouquan Oil Production Plant, Karamay 834000, Xinjiang，China

Online:2020-08-12 Published:2020-08-01
Contact: Nanjun LAI

支化结构对树枝状聚合物溶液剪切前后流变性能的影响

赖南君¹^,²^,³(), 温小虎¹, 赵文森⁴, 王勇⁵, 赵旭斌⁵, 周丹⁵

^1.西南石油大学化学化工学院，四川成都 610500
^2.油气藏地质及开发工程国家重点实验室（成都理工大学），四川成都 610059
^3.聚合物分子工程国家重点实验室（复旦大学），上海 200438
^4.中海油研究总院有限责任公司，北京 100028
^5.中国石油新疆油田分公司百口泉采油厂，新疆克拉玛依 834000

通讯作者: 赖南君
作者简介:赖南君（1979—），男，博士，教授，博士生导师，研究方向为应用化学/石油工程。E-mail: lainanjun@126.com。
基金资助:
国家自然科学基金(51674208);中国石油科技创新基金(2018D-5007-0207);油气藏地质及开发工程国家重点实验室（成都理工大学）开放基金(PLC20180103);聚合物分子工程国家重点实验室（复旦大学）开放基金(K2017-25);四川省科技计划项目（应用基础研究）(2018JY0515);南充市科技项目(NC17SY4017)

Abstract

Abstract:

In this paper, the effect of different branching degree on the rheological properties of dendritic polymers before and after shearing was studied by using the Warning Mixing Speed Governor to simulate the shearing action of polymer in its preparation, transportation and injection. Firstly, the changes of viscosity before and after shearing of dendritic polymer solutions with different degree branching at different polymer concentrations, different shear times and different shear strengths were analyzed. Three kinds of dendritic polymers with different degrees of branching were prepared, and the molecular size distribution and molecular weight of the dendritic polymers before and after shearing were studied. Moreover, the effects of different factors on the rheological properties of the dendritic polymers were studied and the viscoelastic properties of the dendrimer solution were analyzed. Finally, the effects of the branched structure on the rheological properties of dendritic polymer solutions before and after shearing were analyzed by environmental scanning electron microscopy. The results showed that the dendritic polymers with higher degree of branching had larger hydrodynamic radius and molecular weight and were less affected by the environment. The dendritic polymer solutions exhibited pseudoplastic fluid characteristics. The higher the degree of branching is, the smaller the power law index n of the polymer solution before and after shearing, and the greater the consistency coefficient K. The higher the degree of branching is, the more easily the entanglement between dendritic polymer branches is to form a dense, multi-layered spatial network structure, resulting in better rheological properties of the polymer solution before and after shearing.

Key words: shearing, polymers, solution, non-Newtonian fluids, rheology

摘要：

采用吴茵混调器模拟聚合物在其配制、输送、注入中的机械剪切作用，研究了不同支化程度对剪切前后的驱油用树枝状聚合物溶液的流变性能的影响。首先制备了3种不同支化程度的树枝状聚合物，研究了剪切前后的树枝状聚合物的分子链粒径分布和分子量大小，然后研究了不同因素对树枝状聚合物流变性能的影响并考察了树枝状聚合物溶液的黏弹性能，最后结合环境扫描电镜分析支化结构对剪切前后树枝状聚合物溶液的流变性能的影响。结果表明：支化程度高的树枝状聚合物具有更大的流体力学半径和分子量，受环境影响较小；树枝状聚合物溶液呈现假塑性流体特征，支化程度越高，剪切前后的聚合物溶液幂律指数n越小、稠度系数K越大；支化程度高的树枝状聚合物溶液支链间越容易发生缠结，形成致密、多层的空间网状结构，致使剪切前后的聚合物溶液的流变性能越好。

关键词: 剪切作用, 聚合物, 溶液, 非牛顿流体, 流变学

CLC Number:

TE357

Nanjun LAI, Xiaohu WEN, Wensen ZHAO, Yong WANG, Xubin ZHAO, Dan ZHOU. Effect of branch structure on rheological properties of dendritic polymer before and after shearing[J]. Chemical Industry and Engineering Progress, 2020, 39(8): 3183-3196.

赖南君, 温小虎, 赵文森, 王勇, 赵旭斌, 周丹. 支化结构对树枝状聚合物溶液剪切前后流变性能的影响[J]. 化工进展, 2020, 39(8): 3183-3196.

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Effect of branch structure on rheological properties of dendritic polymer before and after shearing

支化结构对树枝状聚合物溶液剪切前后流变性能的影响

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