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用一系模型化合物归属了氟硅油和氟硅橡胶(聚甲基,r.r.r.三氟丙基硅氧烷,的~1H NMR谱,提出了一测定氟硅油分子量的方法。此法是基于端基的测量。对于甲基封端的氟硅油,x=6S_(CH_3)(b)/S_(CH_3)(a),M=156x+162对于羟基封端的氟硅油,x=((S_(CH_3)(b))/(S_(CH_3)(a))+1)×2,M=156x+18SCH_3(a)和SCH_3(b)分别为端甲基和其余的甲基的峰面积,x和M分别为聚合度和分子量。 使用高灵敏度的~1HNMR谱测定了氟硅橡胶中乙烯基含量和一系列共聚物的组成。 乙烯基 mole%=(S_(-CH-CH_2))/(S_(-CH_2))×(2/3)S_(-CH-CH_2)和S_(-CH_2)分别是乙烯基和-CH_2基的峰面积。
A series of model compounds have been assigned to the ~ 1H NMR spectrum of fluorosilicone and fluorosilicone rubbers (polymethyl, rrr trifluoropropylsiloxanes), and a method for the determination of the molecular weight of fluorosilicone oil has been proposed. This method is based on terminal groups X = 6S_ (CH_3) (b) / S_ (CH_3) (a), M = 156x + 162 for the methyl-terminated fluorosilicone oil x = ((S_ (CH_3) b )) / (S_ (CH_3) (a)) + 1) × 2, M = 156x + 18SCH_3 (a) and SCH_3 (b) are the peak areas of the terminal methyl group and the remaining methyl groups, The degree of polymerization and the molecular weight.The vinyl content and the composition of a series of copolymers of fluorosilicone rubber were determined by ~ 1HNMR spectra with high sensitivity.Vinyl mole% = (S _ (- CH-CH_2)) / (S _ (- CH_2) ) × (2/3) S _ (- CH-CH_2) and S_ (- CH_2) are the peak areas of vinyl and -CH_2 groups, respectively.