凝固浴温度对再生纤维素材料结构与性能的影响研究

卢洪超; 夏钲豪; 米勤勇; 张金明; 余坚; 张军

doi:10.11777/j.issn1000-3304.2022.22396

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凝固浴温度对再生纤维素材料结构与性能的影响研究

研究论文 | 更新时间：2023-06-21

- 凝固浴温度对再生纤维素材料结构与性能的影响研究
- Effect of Coagulation Bath Temperature on the Structure and Properties of Regenerated Cellulose Materials
- 高分子学报 2023年54卷第7期页码：1064-1073
- 作者机构：
  
  1.中国石化北京化工研究院北京 100013
  2.中国科学院化学研究所中国科学院工程塑料重点实验室北京 100190
  3.中国科学院大学化学科学学院北京 100049
- 作者简介：
  
  E-mail: zhjm@iccas.ac.cn
- 基金信息：
  
  国家自然科学基金(基金号 ┣52173292);U2004211┫
- DOI：10.11777/j.issn1000-3304.2022.22396
  中图分类号：
- 纸质出版日期：2023-07-20，
  
  网络出版日期：2023-03-29，
  
  收稿日期：2022-11-18，
  
  修回日期：2023-02-13，
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卢洪超,夏钲豪,米勤勇等.凝固浴温度对再生纤维素材料结构与性能的影响研究[J].高分子学报,2023,54(07):1064-1073.

Lu Hong-chao,Xia Zheng-hao,Mi Qin-yong,et al.Effect of Coagulation Bath Temperature on the Structure and Properties of Regenerated Cellulose Materials[J].ACTA POLYMERICA SINICA,2023,54(07):1064-1073.
卢洪超,夏钲豪,米勤勇等.凝固浴温度对再生纤维素材料结构与性能的影响研究[J].高分子学报,2023,54(07):1064-1073. DOI： 10.11777/j.issn1000-3304.2022.22396.

Lu Hong-chao,Xia Zheng-hao,Mi Qin-yong,et al.Effect of Coagulation Bath Temperature on the Structure and Properties of Regenerated Cellulose Materials[J].ACTA POLYMERICA SINICA,2023,54(07):1064-1073. DOI： 10.11777/j.issn1000-3304.2022.22396.

摘要

以1-烯丙基-3-甲基咪唑氯盐(AmimCl)离子液体为纤维素溶剂，水为凝固浴，通过调控凝固温度分别在不同凝固浴温度下获得再生纤维素气凝胶和再生纤维素膜，研究了再生纤维素气凝胶和再生纤维素膜的微观结构与性能的关系. 结果表明：凝固浴温度对再生纤维素气凝胶和再生纤维素膜的微观结构影响显著，进而影响再生纤维素气凝胶膜和再生纤维素膜的光学性能和力学性能，从而建立了凝固浴温度与再生纤维素材料结构和性能之间的关系，对以离子液体为溶剂的再生纤维素材料工业化生产具有一定的指导意义.

Abstract

Using 1-allyl-3-methylimidazolium chloride (AmimCl) ionic liquid as the cellulose solvent and water as the coagulation bath

regenerated cellulose aerogels and regenerated cellulose films were obtained at different coagulation bath temperatures by regulating the coagulation temperature

and the relationship between the microstructure and properties of regenerated cellulose aerogels and regenerated cellulose membranes was investigated. The results show that the coagulation bath temperature has a significant effect on the microstructure of regenerated cellulose aerogels and regenerated cellulose films

which in turn affects the optical and mechanical properties of regenerated cellulose aerogel films and regenerated cellulose films. When the coagulation bath temperature is low

the diffusion rate of ionic liquid into the coagulation bath is slow

the regeneration rate of cellulose solution is slow

and the structural difference between the surface and the interior of the cellulose hydrogel is smaller and denser. When the coagulation bath temperature is high

the diffusion rate of ionic liquid into the coagulation bath is faster

the regeneration rate of cellulose solution is faster

and the structural difference between the surface and the interior of the cellulose hydrogel is larger and looser. With the increase of the coagulation bath temperature

the pore size of the cellulose aerogel increases

the porosity increases

the specific surface area decreases

and more importantly

the surface pore size is obviously larger than the internal pore size

and this difference increases significantly with the increase of the coagulation bath temperature. The changes in the microstructure of the cellulose aerogel resulted in the decrease of its mechanical strength

Young's modulus

elongation at break and light transmission from 3.1 MPa

41.5 MPa

24.7% and 88.82% to 0.2 MPa

7.3 MPa

4.6% and 0.07%

respectively. However

with the increase of coagulation bath temperature

the crystallinity of regenerated cellulose film decreases and the surface roughness increases

its mechanical strength

Young's modulus and elongation at break decreased from 162.3 MPa

5389.8 MPa and 22.6% to 43.1 MPa

3923.4 MPa and 1.4%

respectively

while the light transmission was higher than 80% and the haze increased significantly up to 40%. Thus

the relationship between the coagulation bath temperature and the performance of the regenerated cellulose material was established

which is a guideline for the industrial production of regenerated cellulose material with ionic liquid as the solvent.

关键词

纤维素离子液体凝胶薄膜结构与性能

Keywords

CelluloseIonic liquidsGelFilmStructure and performance

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