Influence of the composition of acrylonitrile copolymer on its glass transition temperature and dying properties
The glass transition temperature(Tg)of the polymer is a key factor affecting the performance of its fibers.In this paper,a series of acrylonitrile copolymers(PAN)with different molecular compositions were pre-pared by aqueous precipitation polymerization,and the relationship between composition of the copolymer and its Tg were studied.The results showed that with the increasing of second monomer methyl acrylate(MA)in the copoly-mer,Tg decreased obviously.When the MA content was 40%,Tg reached 53.7℃,which decreased to about 40%of conventional polyacrylonitrile(Tg was about 90℃).The incorporating with third monomer,sodium methacry-late sulfonate(MAS),had no significant effect on Tg.When MAS content was 2%,Tg was 67.7℃,and when MAS content was 5%,Tg was 67.9℃.When the conventional polyacrylonitrile and acrylonitrile terpolymer were dyed,the equilibrium dyeing rate(dyeing temperature was 70℃)increased from 43.5%to 99.9%.It can be seen that the Tg of acrylonitrile copolymer can be regulated by changing the proportion of the second mono-mer MA.The dyeing properties of acrylonitrile copolymers can be controlled by changing the ratio of the sec-ond monomer MA to the third monomer MAS.
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