Polyacrylonitrile solution (PAN) ammoniated was a necessary means to obtain homogeneous and compact precursor with excellent physical and chemical properties.PAN nascent fiber and precursor were prepared by dry-wet spinning through adding ammonia into acrylonitrile (AN) polymerization system and mixing ammoniation into PAN solution after polymerization.Effects of ammoniation on cross section,swelling degree,bulk density of PAN fiber,strength and modulus of precursor were studied.The results shown that the PAN fiber with circular cross-section can be easily obtained by ammoniation,and the circular cross-section with roundness of 0.91 can be obtained when the ammoniation degree of the polymerization system was 16%,while the same roundness (0.91) cross-section can be obtained only when the ammoniation degree of the polymerization solution was 28%.The results shown that PAN fiber was more compact after ammoniation,which shown that the swelling degree of nascent fiber was lower and the density of PAN precursor was higher.When the degree of ammoniation was less than 28%,ammoniated polymerization system had lower swelling degree and higher precursor density than ammoniated polymerization solution.However,when the ammoniation degree was in the suitable range of 16%~24%,the strength and modulus CV of precursor decreased significantly.If PAN fiber needed to reach the same swelling degree,bulk density,strength and modulus CV value,the ammoniation degree of polymerization system ammoniated solution was lower.
Shi Jin, Qian Hongchuan, Li Senyuan, Wang Feixiang, Li Changqing
. Influence of ammoniation method on structure and property of PAN precursor[J]. New Chemical Materials, 2021
, 49(2)
: 153
-157
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.02.035
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