Creep Dynamics of Non-entangled Symmetric Associative Polymers

Yan-jie Zhang; Quan Chen

doi:10.11777/j.issn1000-3304.2021.21014

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Creep Dynamics of Non-entangled Symmetric Associative Polymers

Research Article | 更新时间：2024-02-20

- Creep Dynamics of Non-entangled Symmetric Associative Polymers
- ACTA POLYMERICA SINICA Vol. 52, Issue 7, Pages: 796-805(2021)
- 作者机构：
  
  1.中国科学院长春应用化学研究所高分子物理与化学国家重点实验室长春 130022
  2.中国科学技术大学应用化学与工程学院合肥 230026
- 作者简介：
  
  Quan Chen, E-mail: qchen@ciac.ac.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2021.21014
  CLC：
- Published：20 July 2021，
  
  Published Online：20 May 2021，
  
  Received：17 January 2021，
  
  Revised：23 February 2021，
扫描看全文
张妍洁,陈全.非缠结对称缔合链在蠕变过程中的动力学行为研究[J].高分子学报,2021,52(07):796-805.

Yan-jie Zhang, Quan Chen. Creep Dynamics of Non-entangled Symmetric Associative Polymers. [J]. ACTA POLYMERICA SINICA 52(7):796-805(2021)
张妍洁,陈全.非缠结对称缔合链在蠕变过程中的动力学行为研究[J].高分子学报,2021,52(07):796-805. DOI： 10.11777/j.issn1000-3304.2021.21014.

Yan-jie Zhang, Quan Chen. Creep Dynamics of Non-entangled Symmetric Associative Polymers. [J]. ACTA POLYMERICA SINICA 52(7):796-805(2021) DOI： 10.11777/j.issn1000-3304.2021.21014.

摘要

首先介绍具有摩擦系数分布的Rouse链的动力学分析方法，并检验了其应用于预测未缠结缔合高分子动力学行为的可行性. 之后利用上述方法研究不同缔合点数量的高分子链分别在固定应变速率的启动剪切(start-up)和固定应力的蠕变(creep)测试过程中，链段的取向函数随时间的变化行为. 阐明了缔合体系在蠕变条件下，高分子链从链段相对独立的运动到整链协同运动的转变机制.

Abstract

In this study

creep dynamics of associative polymers is analyzed on a basis of Rouse model. The association sites

the stickers

are introduced

via

increasing the segmental friction of the associative sites. First

we clarify the relationship between the Rouse model with frictional distribution and the sticky-Rouse model with stickers having fixed “lifetime”. Namely

we explain how to choose the friction coefficient so as to model the associative polymers with stickers of fixed lifetime. Comparison between the prediction of the Rouse model with frictional distribution and either the discrete or the continuous sticky-Rouse model rationalizes the choice. Second

we use the Rouse model with frictional distribution to analyze the conformational evolution of non-entangled symmetric associative polymers during the start-up shear and creep processes. During the start-up shear

the orientation function (representing an average segmental orientation of a given position of the chains) increases with time

and finally reaches the steady state. The orientation function increases from the ends to the center of the chains

akin to that of non-associative polymer chains. Nevertheless

we find a unique stepwise increase of orientation anisotropy at the sticky sites. We attribute this feature to the dynamic roles of the sticky and non-sticky segments. Namely

the sticky segments are strongly oriented by the shear flow field

and the non-sticky segments confined between the sticky segments are forced to transmit the orientational force of the sticky segments. During the creep process with fixed stress

the evolution of the conformation function experiences obviously two stages. In the early stage

only the segmental motion is activated

where the sticky and non-sticky segments behave accordingly to their intrinsic nature

the sticky and non-sticky segments increase and decrease the orientation function

respectively

so as to maintain the steady stress. In the second stage

the segmental motion extends gradually to the chain dimension and the orientation function of both the sticky and non-sticky segments achieve gradually to the steady-state.

关键词

sticky-Rouse模型摩擦系数分布启动剪切蠕变

Keywords

sticky-Rouse modelFrictional distributionStart-up shearCreep

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College of Materials Science and Engineering, Jilin University

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

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