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| Preparation of Cellulose-PVA Composite Gel and Its Properties |
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| DOI：10.11981/j.issn.1000-6842.2019.01.31 |
| Key Words:N-methylmorpholine-N-oxide (NMMO); cellulose; polyvinyl alcohol (PVA); composite gel |
| Fund Project:江苏省研究生科研与实践创新计划项目（KYCX17_0845）。 |
| Author Name | Affiliation | | ZHANG Lili1,2 | 1.College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 | | SI Yudan2 | 2.College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 | | WANG Zhiguo2 | 2.College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 | | FAN Yimin1，* | 1.College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 |
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| Abstract: |
| The cellulose-PVA composite gels were prepared by sol-gel process via dissolving microcrystalline cellulose in NMMO solvent system and combining with PVA NMMO solution. The effect of various coagulation bath on gel properties was investigated for exploring the gelation mechanism.The crystal structure, thermostability and micro-morphology of the gel were investigated by XRD, TGA and SEM.Compared with water and ethanol coagulation bath, the cellulose-PVA composite gel regenerated by 20% NMMO/1% borax exhibited the best mechanical strength.The crystal structure of composite gel after dissolution-regeneration was transformed from cellulose I to cellulose II.After crosslinking of cellulose and PVA, the new peaks at 2θ=13.18° and 19.46° appeared in cellulose-PVA composite gel.The thermal degradation temperature of cellulose-PVA composite gel (280℃) was higher than cellulose gel (270℃), indicating that thermostability of composite gel was improved.From micromorphology of gel, the pore structure of composite gel regenerated by 20%NMMO/1% borax was more uniform than cellulose gel. |
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