CaCl2/H2O2引发木质素接枝天然橡胶的制备及其应用研究

胡洁; 冯振东; 段咏欣

doi:10.11777/j.issn1000-3304.2023.23186

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CaCl₂/H₂O₂引发木质素接枝天然橡胶的制备及其应用研究

研究论文 | 更新时间：2024-01-03

- CaCl₂/H₂O₂引发木质素接枝天然橡胶的制备及其应用研究
- Preparation and Application of Lignin Grafted Natural Rubber Initiated by CaCl₂/H₂O₂
- 高分子学报 2024年55卷第1期页码：120-128
- 作者机构：
  
  青岛科技大学橡塑材料与工程教育部重点实验室青岛 266042
- 作者简介：
  
  E-mail: dyx@qust.edu.cn
- 基金信息：
  
  国家自然科学基金(基金号 51573082)
- DOI：10.11777/j.issn1000-3304.2023.23186
  中图分类号：
- 纸质出版日期：2024-01-20，
  
  网络出版日期：2023-11-22，
  
  收稿日期：2023-07-13，
  
  录用日期：2023-08-25
- 稿件说明：
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胡洁, 冯振东, 段咏欣. CaCl₂/H₂O₂引发木质素接枝天然橡胶的制备及其应用研究. 高分子学报, 2024, 55(1), 120-128

Hu, J.; Feng, Z. D.; Duan, Y. X. Preparation and application of lignin grafted natural rubber initiated by CaCl₂/H₂O₂. Acta Polymerica Sinica, 2024, 55(1), 120-128
胡洁, 冯振东, 段咏欣. CaCl₂/H₂O₂引发木质素接枝天然橡胶的制备及其应用研究. 高分子学报, 2024, 55(1), 120-128 DOI： 10.11777/j.issn1000-3304.2023.23186.

Hu, J.; Feng, Z. D.; Duan, Y. X. Preparation and application of lignin grafted natural rubber initiated by CaCl₂/H₂O₂. Acta Polymerica Sinica, 2024, 55(1), 120-128 DOI： 10.11777/j.issn1000-3304.2023.23186.

摘要

添加增容剂是改善极性木质素(LN)与非极性橡胶相容性差的有效措施之一，有助于提高LN补强效果. 本文中采用CaCl

作为自由基引发体系制备了LN接枝的天然橡胶(LGN)，并将其用于天然橡胶(NR)/LN复合材料的界面增容. 研究表明，CaCl

不但可以引发LN产生大分子自由基，而且会氧化NR双键断裂生成不饱和酮，使NR分子量降低. 对接枝过程中加料顺序进行调控，采用CaCl

先处理LN，不但可以有效地减轻NR的氧化降解，而且有助于LN产生更多的大分子自由基.采用傅里叶变换红外光谱(FTIR)对LN、NR和LGN化学结构的表征表明：LN接枝NR的机理为LN的酚羟基自由基与NR的甲基反应形成C―O―C键. 得益于LGN优异的界面增容作用，增容后的NR/LN复合材料的拉伸强度和撕裂强度较增容前分别提高了14.3%和7.5%.

Abstract

Adding compatibilizers is one of the effective ways to improve the poor compatibility between polar lignin (LN) and non-polar rubber

which helps to improve the reinforcing effect of LN. Herein

LN grafted natural rubber (LGN) was prepared using CaCl

as the radical initiating system

which acted as the compatibilizer for the natural rubber (NR)/LN composites. Detailed researches show that CaCl

can not only initiate LN to produce macromolecular free radicals

but also oxidize the double bonds of NR into unsaturated ketones which reduces the molecular weight of NR. Adjusting the feeding order in the grafting process and using CaCl

to treat LN first are helpful to reduce the oxidative degradation of NR and produce more LN macromolecular free radicals. The mechanism of LN grafted NR was explored by the Fourier transform infrared spectroscopy (FTIR) characterization of LN

NR and LGN

that is

the phenol hydroxyl radicals of LN reacted with the methyl groups of NR to form C―O―C bond. Benefiting from the excellent interfacial compatibilization of LGN

the tensile strength and tear strength of NR/LN composite after compatibilization increased by 14.3% and 7.5%

respectively

compared to those before compatibilization. This work provides a new way for preparing the compatibilizer of NR/LN composite

which is of great significance to promote the application of LN in the rubber industry.

关键词

木质素天然橡胶CaCl2/H2O2接枝增容剂复合材料

Keywords

LigninNatural rubberCaCl2/H2O2GraftCompatibilizerComposites

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