Effect of Mechanical Shear on the Molecular Weight and Properties of Natural Rubber

Ru ZHANG; Xiao-xue LIAO; Shuang-quan LIAO; Yan-fang ZHAO; Shi-qiao LUO; Shuang HE

doi:10.14028/j.cnki.1003-3726.2019.12.003

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Effect of Mechanical Shear on the Molecular Weight and Properties of Natural Rubber

更新时间：2022-09-05

- Effect of Mechanical Shear on the Molecular Weight and Properties of Natural Rubber
- Polymer Bulletin Vol. 32, Issue 12, Pages: 26-33(2019)
- 作者机构：
  
  1.海南大学材料科学与工程学院，海口 570228
  2.热带岛屿资源先进材料教育部重点实验室（海南大学），海口 570228
  3.中国热带农业科学院橡胶研究，海口 571101
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2019.12.003
  CLC：
- Published：20 December 2019，
  
  Received：05 December 2018，
  
  Revised：25 October 2019，
扫描看全文
Ru ZHANG, Xiao-xue LIAO, Shuang-quan LIAO, Yan-fang ZHAO, Shi-qiao LUO, Shuang HE. Effect of Mechanical Shear on the Molecular Weight and Properties of Natural Rubber. [J]. Polymer Bulletin 32(12):26-33(2019)
DOI：

Ru ZHANG, Xiao-xue LIAO, Shuang-quan LIAO, Yan-fang ZHAO, Shi-qiao LUO, Shuang HE. Effect of Mechanical Shear on the Molecular Weight and Properties of Natural Rubber. [J]. Polymer Bulletin 32(12):26-33(2019) DOI： 10.14028/j.cnki.1003-3726.2019.12.003.

摘要

通过机械剪切力作用改变天然橡胶（SCRWF）的分子量及其分布，采用凝胶渗透色谱法测试发现，SCRWF在处理后的相对分子量和分布的变化明显，比较分析不同胶样塑性初值（

）、塑性保持率（PRI)、门尼粘度和应力松弛时间等生胶性能，对硫化胶的热稳定性、力学性能，及加工性能进行分析。结果表明，随着机械剪切力作用增加，天然橡胶分子量减小，其单峰趋势明显，生胶质量受其影响变化较大，对热稳定性有影响，且硫化胶的力学性能下降。RPA分析表明，在应变扫描中，随着应变的增加，机械剪切力作用增加的胶样的损耗因子（tanδ)线性增加而弹性模量（

'）线性减小；频率扫描中，随着频率增加，机械剪切力作用增加的胶样损耗因子（tanδ）线性减小而弹性模量（

'）线性增加。

Abstract

The molecular weight and distribution of natural rubber (SCRWF) were changed by mechanical shearing force. Gel permeation chromatography was used to test and demonstrate that the molecular weight and molecular weight distribution of SCRWF changed apparently after treatment. The plastic properties of plasticity initial values (

)

plastic retention (PRI)

Mooney viscosity and stress relaxation time of different rubber samples were compared and analyzed. The thermal stability

mechanical properties and processing properties of vulcanized rubber were analyzed. The results show that the molecular weight of natural rubber decreases with the increase of mechanical shearing force

and its single peak trend is obvious. The quality of the raw rubber and the thermal stability is greatly affected by mechanical shearing force

and the mechanical properties of the vulcanized rubber are degraded with the increase of mechanical shearing force. Rubber processing analyzer (RPA) analysis shows that the loss factor (tanδ)of the samples increases linearly and the elastic modulus (

') decreases linearly with the increase of strain in the strain sweep

the loss factor (tanδ) of the samples decreases linearly and the elastic modulus (

') increases linearly with the increase of frequency.

关键词

天然橡胶机械剪切力相对分子质量性能

Keywords

Natural rubberMechanical shear forceRelative molecular massPerformance

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