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Effect of Coagulation Bath Temperature on the Structure and Properties of Regenerated Cellulose Materials
- ACTA POLYMERICA SINICA Vol. 54, Issue 7, Pages: 1064-1073(2023)
- 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：
Jin-ming Zhang, E-mail: zhjm@iccas.ac.cn
- 基金信息：
DOI：10.11777/j.issn1000-3304.2022.22396
CLC：Published：20 July 2023，
Published Online：29 March 2023，
Received：18 November 2022，
Revised：13 February 2023，
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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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