An organocatalytic controlled/living ring-opening polymerization (ROP) of 1,3,5-triphenyl-1,3,5-tri(p-tolyl)cyclotrisiloxane (PT3) using water or silanols as an initiator, 1,3-trimethylene-2-n-propylguanidine (TMnPG) as a catalyst, and organochlorosilanes or organoaminosilanes as end-capping agents was developed for the precise synthesis of symmetrically and asymmetrically terminated linear poly[phenyl(p-tolyl)siloxane] (PPTS) with controlled number-average molar mass (M_n), narrow molar-mass dispersity (Đ_M), and targeted terminal structures. The synthesis of PT3 was achieved by the reaction of dichloro(phenyl)-p-tolylsilane (PhpTolSiCl₂) and sodium hydrogen carbonate in dry toluene using simple synthetic procedures. The keys to controlling these ROP reactions are the use of THF as a solvent and the termination of the polymerization at the appropriate time. The precise synthesis of triblock copolymers of PPTS and poly(dimethylsiloxane) (PDMS), i.e., PPTS-b-PDMS-b-PPTS, was achieved by both the polymerization of PT3 using linear symmetric PDMS with two terminal silanol groups (PDMS-(OH)₂) as a macroinitiator and the two-stage polymerization of hexamethylcyclotrisiloxane (D3) and PT3. The synthesized PPTS and PPTS-b-PDMS-b-PPTS showed good solubility in various organic solvents. A thermal analysis of the synthesized PPTS revealed high heat resistance and fusibility.

中文翻译：

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1,3,5-三苯基-1,3,5-三对甲苯基环三硅氧烷的有机催化控制/活性开环聚合，用于精确合成易熔、可溶、官能化和固体聚[苯基（对甲苯基）硅氧烷] 秒

1,3,5-三苯基-1,3,5-三（对甲苯基）环三硅氧烷（PT3）的有机催化控制/活性开环聚合（ROP），使用水或硅烷醇作为引发剂，1,3-三亚甲基-2-正丙基胍（TMnPG）作为催化剂，有机氯硅烷或有机氨基硅烷作为封端剂被开发用于精确合成对称和不对称封端的线性聚[苯基（对甲苯基）硅氧烷]（PPTS），其数量可控- 平均摩尔质量 ( M _n )、窄摩尔质量分散度 ( Đ _M ) 和目标末端结构。PT3的合成是通过二氯（苯基）-对甲苯基硅烷（Ph pTolSiCl ₂ ) 和碳酸氢钠在干燥甲苯中使用简单的合成程序。控制这些 ROP 反应的关键是使用 THF 作为溶剂并在适当的时间终止聚合。PPTS 和聚（二甲基硅氧烷）（PDMS）的三嵌段共聚物，即PPTS- b -PDMS- b -PPTS的精确合成是通过使用具有两个末端硅烷醇基团的线性对称 PDMS（PDMS-（ OH) ₂ ) 作为大分子引发剂和六甲基环三硅氧烷 (D3) 和 PT3 的两阶段聚合。合成的PPTS和PPTS- b- PDMS- b-PPTS 在各种有机溶剂中显示出良好的溶解性。合成的 PPTS 的热分析显示出高耐热性和可熔性。