论文部分内容阅读
本文研究所推导的凝胶生成动力学方程,可清楚地理解凝胶生成的机理如下:(1)当交联度qq_g时,交联越过了凝胶点,体系中凝胶与溶胶共存。从动力学方程中可清楚地知道,溶胶转变成凝胶是溶胶分子中未交联的链单位(对重均链长而言)与凝胶分子中未交联单位之间的相互作用,溶胶分子被逐渐带入凝胶,导致溶胶分数的减少,而溶胶中每有Pw(s)S(1-S)dq与凝胶产生交联,则会造成体系中溶胶减少dS。(Pw(s)为辐照剂量R的减函数,S为溶胶分数)。单位剂量的交联度q_0是剂量的减函数,可以公式q_0=2/((RP_(W(S))(1-2S+S~(1/2))计算各剂量的q_0值,从而可知q_0～R关系。在已知Pw(s)～R和q_0～R关系后,由ln(1-S)/S=∫q_0Pw(s)关系式可讨论交联过程中凝胶的分配。
In this paper, we derive the kinetic equation of gel formation, and clearly understand the mechanism of gel formation as follows: (1) When the degree of crosslinking q q_g, the cross-linked gel point, the gel system and sol co-exist. It is clear from the kinetic equations that the sol to gel transition is the interaction between un-crosslinked units of the sol (in terms of weight-average chain length) and un-crosslinked units in the gel molecules, and the sol The molecules are gradually brought into the gel, resulting in a decrease of the sol fraction, and each Pw (s) S (1-S) dq in the sol crosslinks with the gel, resulting in a decrease of the sol in the system by dS. (Pw (s) is the decreasing function of irradiation dose R, S is the sol fraction). The cross-linking degree of unit dose q_0 is a decreasing function of dose. The q_0 value of each dose can be calculated by the formula q_0 = 2 / (RP_ (W (S)) (1-2S + S 1/2) q ~ 0 ~ R. After the relationship between Pw (s) ~ R and q_0 ~ R is known, the distribution of the gel in the crosslinking process can be discussed by the relation of ln (1-S) / S = ∫q_0Pw (s)