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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第4期    总第194期    2010年8月

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文章编号:1672-7207(2010)04-1327-07
纤维素基湿度控制材料的制备与表征
李鑫1, 2,冯伟洪1,卢其明1,夏启斌2

(1. 华南农业大学 理学院,广东 广州,510642;
2. 华南理工大学 化学化工学院,广东省绿色化学产品技术重点实验室,广东 广州,510640
)

摘 要: 以甲基纤维素作为接枝共聚的原料合成纤维素基湿度控制材料,并加入CaCl2和异丙基丙烯酰胺改善其吸放湿性能;通过间歇式吸附/脱附进行吸、放湿动力学实验与恒温脱附实验,采用热重分析(TG-DTA)和红外光谱(FTIR)表征改性复合材料的热稳定性及其结构。研究结果表明:该类材料具有吸湿量较大、易再生和稳定性高的特性,CaCl2改性材料在相对湿度为100%的最大湿容量为1.45 g/g,吸湿平衡时间约160 h;而相对湿度为90%达到湿平衡的样品放湿需约60 h,在80 ℃恒温烘箱中脱附40%仅需10 min。加入异丙基丙烯酰胺后材料的放湿速率明显增大,且所有材料在300 ℃以下具有较强的热稳定性。

 

关键字: 甲基纤维素;温敏性;异位脱附;吸放湿性能

Synthesis and characterization of
cellulose humidity control materials
LI Xin1, 2, FENG Wei-hong1, LU Qi-ming1, XIA Qi-bin2

1. The College of Science, South China Agriculture University, Guangzhou 510642, China;
2. The Guangdong Provincial Laboratory of Green Chemical Technology, College of Chemical Engineering and Energy, South China University of Technology, Guangzhou 510640, China

Abstract:Cellulose humidity control materials were synthesised by methyl cellulose as a graft copolymerization of raw materials, and CaCl2 and NIPAm were added into the materials to improve the moisture absorption and desorption performance, and then kinetic experiments of moisture absorption/release on the humidity-controlling composite materials were carried out with the help of batch adsorption/desorption experiment. The thermal decomposition temperature and structure of humidity-controlling composite material were estimated separately by means of TG-DTA and FTIR, and the effects of the moisture absorption/release of humidity-controlling composite material were discussed. The results show that the product has higher hygroscopic capability, easier regeneration and better heat stability. The time of the product modifies by CaCl2 to reach its humidity-controlling balance is about 160 h, the hygroscopic capacity of the product is 1.45 g/g. At the same time, it’s about 60 h to release humidity from the product at 90%, and it only takes 10 min to desorbed 40% of adsorbed water in the 80 ℃ oven. What’s more, the releasing humidity rate of the product modified by NINPAm increases greatly, and the thermal decomposition temperature of the product is about 300 ℃.

 

Key words: methyl cellulose; thermosensitivity; desorption; moisture absorption and release properties

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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