TY - JOUR
T1 - Study on the synthesis of high elongation polyurethane
AU - Li, Fangxing
AU - Zuo, Ju
AU - Dong, Limei
AU - Wang, Hongjun
AU - Luo, Jiazhong
AU - Han, Weirong
AU - Huo, Yujie
PY - 1998/1
Y1 - 1998/1
N2 - In this paper, polyurethane (PU) was synthesized in the following steps: first, polytetramethaneoxy glycol (PTMG) prepolymerizes with 4-4′-diphenylmethane diisocyanate (MDI) at a molar ratio of 1:2; then, the prepolymer continuously reacts with 1,4-butanediol (BD) or hexanedimine (HD) to extend the polymer chain. A series of PU samples could be synthesized by reducing the amount of chain extender. The change in extensibility of PU with the amount of chain extender was investigated. The results indicate that the extensibility of PU could be improved greatly with a reduction of the amount of chain extender. This could be ascribed to the fact that excessive -NCO groups can react with the hydrogen atoms in -NHCOO-, and form branch chains. When the molecular weight of PTMG is 1684, with BD as the chain extender, the ultimate elongation of PU was 2280%; when HD was the chain extender, the ultimate elongation of PU was 1809%. The submicroscopic structure of the samples was found to be amorphous by the method of small angle laser light scattering, and these samples could dissolve in dimethyl formamide (DMF). The influence of DMF on the polymerization was also investigated.
AB - In this paper, polyurethane (PU) was synthesized in the following steps: first, polytetramethaneoxy glycol (PTMG) prepolymerizes with 4-4′-diphenylmethane diisocyanate (MDI) at a molar ratio of 1:2; then, the prepolymer continuously reacts with 1,4-butanediol (BD) or hexanedimine (HD) to extend the polymer chain. A series of PU samples could be synthesized by reducing the amount of chain extender. The change in extensibility of PU with the amount of chain extender was investigated. The results indicate that the extensibility of PU could be improved greatly with a reduction of the amount of chain extender. This could be ascribed to the fact that excessive -NCO groups can react with the hydrogen atoms in -NHCOO-, and form branch chains. When the molecular weight of PTMG is 1684, with BD as the chain extender, the ultimate elongation of PU was 2280%; when HD was the chain extender, the ultimate elongation of PU was 1809%. The submicroscopic structure of the samples was found to be amorphous by the method of small angle laser light scattering, and these samples could dissolve in dimethyl formamide (DMF). The influence of DMF on the polymerization was also investigated.
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U2 - 10.1016/S0014-3057(97)00077-3
DO - 10.1016/S0014-3057(97)00077-3
M3 - Article
AN - SCOPUS:0013152151
SN - 0014-3057
VL - 34
SP - 59
EP - 66
JO - European Polymer Journal
JF - European Polymer Journal
IS - 1
ER -