聚丙烯腈基交联水解羧酸纤维的制备及其结构性能表征
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摘要
以聚丙烯腈(PAN)纤维为基体,聚乙烯亚胺(PEI)为交联剂,采用水解—交联—水解工艺制备得到PAN基交联水解羧酸纤维(PEIXPAN-COOH纤维),并对其结构与性能进行了表征。结果表明:通过三步法制得的PEIXPAN-COOH纤维经红外光谱证实为目标产物,且纤维表面平整度较基体PAN纤维降低;纤维的羧基含量为4. 5 mmol/g,断裂强度为4. 43 cN/dtex,断裂伸长率为31. 1%,纤维的初始模量为39. 33 cN/dtex,与基体PAN纤维相比,其断裂强度和断裂伸长率分别下降了2. 6%和5. 8%,初始模量提高了6. 6%; PEIX-PAN-COOH纤维吸水性较好,其增重倍数为31,而基体PAN纤维增重倍数仅为6。
Crosslinking carboxylic fibers based on polyacrylonitrile( PAN) fibers( PEIXPAN-COOH fiber) were prepared through hydrolyzing-crosslinking-hydrolyzing process using PAN fibers as matrix and polyethyleneimine( PEI) as a crosslinking agent. Their structure and properties were characterized. The results showed that PEIXPAN-COOH fiber prepared by the threestep process was the target product proved by infrared spectroscopy and had the surface smoothness lower than PAN fiber; the fiber exhibited the carboxyl group content of 4. 5 mmol/g,breaking strength 4. 43 cN/dtex,elongation at break 31. 1% and initial modulus of 39. 33 cN/dtex; as compared with PAN fiber,the fiber showed an increase of 2. 6% and 5. 8% in breaking strength and elongation at break,respectively,and an increase of 6. 6% in initial modulus; PEIXPAN-COOH fiber had the weight gain multiple of 31,indicating a fairly good water absorption,when PAN fiber had the weight gain multiple of only 6.
Crosslinking carboxylic fibers based on polyacrylonitrile( PAN) fibers( PEIXPAN-COOH fiber) were prepared through hydrolyzing-crosslinking-hydrolyzing process using PAN fibers as matrix and polyethyleneimine( PEI) as a crosslinking agent. Their structure and properties were characterized. The results showed that PEIXPAN-COOH fiber prepared by the threestep process was the target product proved by infrared spectroscopy and had the surface smoothness lower than PAN fiber; the fiber exhibited the carboxyl group content of 4. 5 mmol/g,breaking strength 4. 43 cN/dtex,elongation at break 31. 1% and initial modulus of 39. 33 cN/dtex; as compared with PAN fiber,the fiber showed an increase of 2. 6% and 5. 8% in breaking strength and elongation at break,respectively,and an increase of 6. 6% in initial modulus; PEIXPAN-COOH fiber had the weight gain multiple of 31,indicating a fairly good water absorption,when PAN fiber had the weight gain multiple of only 6.
引文
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[11]皇静,欧阳琴,钱鑫,等.硫酸水解法改性聚丙烯腈纤维的结构与性能[J].合成纤维工业,2015,38(3):5-8,12.
[2]宋艳阳,原思国,周从章.弱酸性离子交换纤维对含镍废水的吸附性能研究[J].功能材料,2012,43(15):2014-2021.
[3]黄做华,田振邦,黄伟庆,等.两种形式的RPFC-1纤维对氨气吸附的研究[J].河南化工,2012,29(13):27-30.
[4]马正升.新型多功能吸湿发热纤维的制备及应用[J].天津纺织科技,2018(2):41-46.
[5]白萌,陈兆文,黄国庆,等.胺基螯合纤维的制备及其对Cu2+的吸附性能研究[J].合成纤维工业,2017,40(6):28-32.
[6]Ermakov I V,Rebrov A I,Litmanovich A D,et al.Alkaline hydrolysis of polyacrylonitrile,1.Structure of the reaction products[J].Macromol Chem Phys,2000,201(13):1415-1418.
[7]Gupte M L,Gupte B,Oppermann W,et al.Surface modification of polyacrylonitrile staple via alkaline hydrolysis for superabsorbent applications[J].J Appl Polym Sci,2004,91(5):3127-3133.
[8]Litmanovich A D,Plate N A.Alkaline hydrolysis of ployacrylonitrile.On the reaction mechanism[J].Macromol Chem Phys,2000,201(16):2176-2180.
[9]周林,周绍箕.弱酸性阳离子交换纤维的制备和应用的研究[J].离子交换与吸附,1993,9(6):486-492.
[10]王金涛,原思国,赵林,等.羧酸型离子交换纤维的制备与性能[J].合成纤维工业,2001,24(6):13-17.
[11]皇静,欧阳琴,钱鑫,等.硫酸水解法改性聚丙烯腈纤维的结构与性能[J].合成纤维工业,2015,38(3):5-8,12.