食品科学 ›› 2019, Vol. 40 ›› Issue (4): 1-6.doi: 10.7506/spkx1002-6630-20171026-297

• 食品化学 •    下一篇

TOCNs、聚丙烯酰胺对羧甲基纤维素钠膜性能的影响

巩?筱1,唐亚丽1,2,*,卢立新1,2,丘晓琳1,2,王?军1,2   

  1. (1.江南大学机械工程学院,江苏?无锡 214122;2.江苏省食品先进制造装备技术重点实验室,江苏?无锡 214122)
  • 出版日期:2019-02-25 发布日期:2019-03-05
  • 基金资助:
    国家自然科学基金面上项目(31671909)

Effects of TOCNs and Cationic Polyacrylamide on Properties of Sodium Carboxymethyl Cellulose Film

GONG Xiao1, TANG Yali1,2,*, LU Lixin1,2, QIU Xiaolin1,2, WANG Jun1,2   

  1. (1. School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China;2. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology, Wuxi 214122, China)
  • Online:2019-02-25 Published:2019-03-05

摘要: 为改善羧甲基纤维素钠(sodium carboxymethyl cellulose,CMC)薄膜的机械性能,利用2,2,6,6-四甲基哌啶氮氧化物氧化法制备的纳米纤维素纤丝(2,2,6,6-tetramethyl-1-piperidinyloxy-oxidized cellulose nanofibrils,TOCNs)增强CMC膜的拉伸强度,利用阳离子聚丙烯酰胺(cationic polyacrylamide,CPAM)在水溶液中电解形成的阳离子与其他两者在水中形成的COO-之间的静电作用及化学反应增强其断裂伸长率,从而制备强度及韧性两者兼优的生物可降解薄膜。研究发现,按照m(CMC)∶m(TOCNs)∶m(CPAM)为50∶10∶1配比制备的复合膜较纯CMC膜拉伸强度增加约177%,断裂伸长率增加约36%,透光率、热稳定性均有提高,但阻氧性略有下降,结果表明,TOCNs的添加能明显提高CMC膜的拉伸强度、热稳定性,CPAM的加入能提高CMC膜的断裂伸长率和透光性,三者之间存在着相互作用和良好的相容性,三者共混能明显改善CMC膜的性能。

关键词: 纳米纤维素, 聚丙烯酰胺, 增强, 静电作用, 生物可降解

Abstract: To improve the mechanical properties of sodium carboxymethyl cellulose (CMC) films, 2,2,6,6-tetramethyl-1-piperidinyloxy-oxidized cellulose nanofibrils (TOCNs) were incorporated into CMC films to enhance the tensile strength, and cationic polyacrylamide (CPAM) was also added to increase the elongation at break by taking advantage of the electrostatic interaction between the cations produced electrolytically from it and the carboxylate ions formed by TOCNs and CMC in aqueous solutions. Biodegradable blend films with good tensile strength and toughness were obtained. The blend film with an m (CMC):m (TOCNs):m (CPAM) ratio of 50:10:1 exhibited an increase in tensile strength of 177% and an increase in elongation at break of 36% as compared with pure CMC film, accompanied by an increase in light transmittance and thermal stability but a slight decrease in oxygen resistance. Our results showed that the tensile strength and thermal stability of CMC film could be improved obviously by adding TOCNs and the elongation at break and light transmittance could be improved obviously by adding CPAM. There were interactions and good compatibility among the three agents, contributing to improved physical and chemical properties of CMC film.

Key words: 2,2,6,6-tetramethyl-1-piperidinyloxy-oxidized cellulose nanofibrils, cationic polyacrylamide, enhancement, electrostatic interactions, biodegradable material

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