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林产化学与工业 ›› 2018, Vol. 38 ›› Issue (3): 41-47.doi: 10.3969/j.issn.0253-2417.2018.03.005

• 研究报告 • 上一篇    下一篇

高力学强度羟乙基纤维素/聚丙烯酸复合水凝胶的制备

郑坤, 牛力, 刘玉鹏, 陈莹, 王春鹏, 储富祥   

  1. 中国林业科学研究院 林产化学工业研究所;生物质化学利用国家工程实验室;国家林业局 林产 化学工程重点开放性实验室;江苏省 生物质能源与材料重点实验室, 江苏 南京 210042
  • 收稿日期:2017-12-07 出版日期:2018-06-25 发布日期:2018-06-22
  • 通讯作者: 陈莹,副研究员,硕士生导师,主要从事天然高分子功能材料的制备和性能研究;E-mail:chenying80cn@aliyun.com。 E-mail:chenying80cn@aliyun.com
  • 作者简介:郑坤(1992-),男,山东淄博人,硕士生,主要从事天然高分子功能材料研究工作
  • 基金资助:
    国家重点研发计划项目(2017YFD0601004);中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2017MA016);江苏省生物质能源与材料重点实验室基本科研业务费(JSBEM-S-201503)

Preparation of Hydroxyethyl Cellulose/Poly(Acrylic Acid) Composite Hydrogels with High Mechanical Strength

ZHENG Kun, NIU Li, LIU Yupeng, CHEN Ying, WANG Chunpeng, CHU Fuxiang   

  1. Institute of Chemical Industry of Forestry Products, CAF;National Engineering Lab. for Biomass Chemical Utilization;Key and Open Lab. of Forest Chemical Engineering, SFA;Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
  • Received:2017-12-07 Online:2018-06-25 Published:2018-06-22

摘要: 利用丙烯酸(AA)单体自由基聚合的方法,将羟乙基纤维素(HEC)作为大分子交联剂,引入聚丙烯酸(PAA)水凝胶中,制备了一种具有氢键交联网络结构的羟乙基纤维素/聚丙烯酸(HEC/PAA)复合水凝胶。当HEC质量分数(以水凝胶固含量计)为20.0%、33.3%、42.9%、50.0%和55.5%时,制备的复合水凝胶分别标记为HEC/PAA-1~HEC/PAA-5。采用力学测试和红外光谱(IR)等手段对水凝胶的性能和结构进行了研究。力学测试结果表明:相比于PAA水凝胶较弱的机械性能,复合水凝胶HEC/PAA-2的压缩强度能达到9.52 MPa,对应的压缩断裂应变为91%,压缩断裂能量达到了513.6 kJ/m3;同时,HEC/PAA水凝胶还表现出了优异的拉伸性能与可恢复性能,HEC/PAA-4的拉伸断裂应力为224.3 kPa,断裂伸长率为198%,拉伸断裂能量为219.5 kJ/m3。HEC/PAA-2溶胀150 h时的吸水溶胀率为2.23 g/g。以上结果表明:HEC/PAA复合水凝胶具有的优异力学性能可能源于PAA大分子与HEC大分子之间的氢键作用,它构成了复合水凝胶特殊的网络结构。

关键词: 氢键, 高力学强度, 羟乙基纤维素, 聚丙烯酸, 复合水凝胶

Abstract: A new kind of elastic hydroxyethyl cellulose/poly(acrylic acid) (HEC/PAA) composite hydrogels was synthesized via free radical polymerization of acrylic acid(AA) with hydroxyethyl cellulose that played the role as a cross-linkers via hydrogen bonding interaction. The prepared composite hydrogels were labeled as HEC/PAA-1-HEC/PAA-5, according to the HEC mass fractions (hydrogel solid content) were 20.0%, 33.3%, 42.9%, 50.0%, 55.5%. The properties and structure of these hydrogels were then investigated by the mechanical testing and Fourier-transform infrared spectroscopy(FT-IR). The mechanical testing showed that the compressive stress of HEC/PAA-2 composite hydrogels could reach 9.52 MPa with the strain of about 91% without a break and the compression fracture energy reached 513.6 kJ/m3. Meanwhile, HEC/PAA hybrid hydrogels exhibited excellent tensile properties and excellent recoverable performance. The tensile fracture strength of HEC/PAA-4 was 224.3 kPa, which was associated with 198% elongation at break and the tensile fracture energy of 219.5 kJ/m3. When HEC/PAA-2 swelled for 150 h, the swelling rate of water was 2.23 g/g. The mechanical test, FT-IR analysis and swelling properties tests results showed that the hydrogen bonds between the PAA chains and HEC chains formed a special network structure and thus resulted in the good mechanical properties of composite hydrogels.

Key words: hydrogen bonding, high mechanical strength, hydroxyethyl cellulose, poly (acrylic acid), composite hydrogels

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