研究了以八甲基环四硅氧烷 (D4)和四甲基四氢环四硅氧烷 (D4-H)为原料、以六甲基二硅氧烷 (MM)为大分子链封端剂合成高分子量含氢聚硅氧烷的新方法。讨论了物料配比与产物分子量及组成的关系 ,比较了不同催化体系对产物分子量、分子量分布以及合成操作的影响。结果发现 ,用 70 % (a.q.)硫酸溶液作催化剂能获得分布窄和分子量高 (Mn=60 ,0 0 0 )的含氢聚硅氧烷 ,且操作简便 ,易得到含 Si-H链节比 β<2 0 %的产物。 In this paper, hexamethyldisiloxane (MM) was used as a macromolecule chain to block octamethylcyclotetrasiloxane (D4) and tetramethyltetrahydrocyclotetrasiloxane (D4-H) New Method for Synthesis of High Molecular Weight Hydrogen-containing Polysiloxanes. The relationship between material ratio and product molecular weight and composition was discussed. The effects of different catalytic systems on product molecular weight, molecular weight distribution and synthesis were compared. As a result, it has been found that a hydrogen-containing polysiloxane having a narrow distribution and a high molecular weight (Mn = 60, 100) can be obtained by using 70% (aq) sulfuric acid as a catalyst and is easy to handle, Section products with β <20%.