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本文研究了聚醚丙烯酸异氰酸酯齐聚物的电子束固化。将这类齐聚物归纳为A_a型分子,A官能团相互反应,并推导了总反应程度P_A、溶胶中反应程度P_(A(S))及凝胶中反应程度P_(A(g))在凝胶点后分别与溶胶分数S_A之间函数关系式。当S_A→1时,取极限值可得凝胶化临界条件为 (P_A)_C=1/(a-1), (P_(A(S)))_C=1/(a-1)及(P_(A(g)))_C=2/a从而可知固化过程的规律为:凝胶点前(S_A=1):P_A=P_(A(S))并逐渐增加,P_(A(g))=0。凝胶点时(S_A=1):P_A=P_(A(S))=1/(a-1),P_(A(g))=2/a。凝胶点后,凝胶与溶胶共存(0P_A>P_(A(S)),但P_A与P_(A(g))单调上升,P_(A(S))单调下降。全为凝胶时(S_A=0):P_A=P_(A(g))=1,P_(A(S))=0。通过红外光谱测定了不同剂量的双键特征峰1415cm~(-1)峰高的变化,可求出双键的消失率(即P_A),并同时测定各剂量的凝胶含量,由P_A～S_A的关系式计算P_A值,两者较吻合,说明这类齐聚物的电子束固化是在双键之间进行的
In this paper, electron beam curing of polyether acrylic isocyanate oligomer was studied. These oligomers were classified into A-type molecules and A functional groups interacted with each other. The total reaction P_A, the reaction degree P_ (A (S)) and the reaction degree P_ (A (g) Gel point after the sol fraction S_A as a function of the relationship between. When the critical value of S_A → 1 is taken, the critical conditions for gelation are (P_A) _C = 1 / (a-1), (P_ (A (S))) _C = 1 / (a-1) and P (A (g))) _ C = 2 / a It can be seen that the law of the curing process is: before the gel point (S_A = 1): P_A = P_ (A ) = 0. Gel point (S_A = 1): P_A = P_ (A (S)) = 1 / (a-1), P_ (A (g)) = 2 / a. After the gel point, the gel coexisted with the sol (0 P_A> P_ (A (S)) but P_A and P_ (A) (A (S)) drops monotonically. When all gels (S_A = 0): P_A = P_ (A (g)) = 1, P_ (A (S)) = 0. The peak value of 1415cm ~ (-1) at different dose of double bond was measured by infrared spectroscopy, the disappearance rate of double bond (P_A) was obtained, and the gel content of each dose was measured at the same time. From P_A to S_A Of the relationship between the calculated P_A value, the two are more consistent, indicating that such oligomers electron beam curing is carried out between the double bonds