Polyacrylonitrile (PAN) solution is the spinning solution to prepare precursor for carbon fiber.The precursor with homogeneous,compact structure and excellent performance can be obtained by ammoniating of PAN solution.The effects of ammoniation degrees on the conversion,molecular weight and distribution,viscosity and hydrophilicity of PAN were studied by adding different amount of ammonia into the ternary polymerization system with acrylonitrile (AN)/methyl methacrylate (MA)/itaconic acid (ITA).The results shown that when the ammoniation degree was lower than 20%,It had little effect on the conversion,molecular weight and distribution of PAN.When the ammoniation degree was greater than 20%,the conversion was decreased from 91.73% to 87.2%,MW decreased from 285000 to 245000,Mn decreased from 94000 to 76000,and distribution increased from 2.98 to 3.4.However,with the increase of ammoniation degree,the rotational viscosity and contact angle of the polymerization solution decreased continuously.The rotational viscosity of PAN solution decreased from 119000 to 98000cP,and the contact angle of PAN solution decreased from 70.1° to 60.3°.The hydrophilicity of PAN solution changed obviously.
Shi Jin, Qian Hongchuan, Li Senyuan, Wang Feixiang, Li Changqing
. Influence of ammoniation degree on polymerization process and property of PAN solution[J]. New Chemical Materials, 2021
, 49(4)
: 176
-179
.
DOI: 10.19817/j.cnki.issn1006-3536.2021.04.038
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