Building-block approach to discrete and sequence-specific oligosiloxanes,Polymer Chemistry

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Building-block approach to discrete and sequence-specific oligosiloxanes
Polymer Chemistry ( IF 4.1 ) Pub Date : 2024-06-17 , DOI: 10.1039/d4py00527a
Takahiro Kawatsu ₁ , Hiroyuki Minamikawa ₁ , Kazuhiko Sato ₁ , Kazuhiro Matsumoto ₁

Affiliation

Discrete and sequence-specific oligomers that combine molecular-level structural precision with macroscopic properties have attracted increasing attention in polymer and materials science. This study reports a facile method to selectively synthesize discrete and sequence-specific oligosiloxanes of up to 26-mer in a single flask on a gram scale by incorporating a siloxane building block into a B(C₆F₅)₃-catalyzed one-pot controlled iteration. The building blocks enable the incorporation of a well-defined oligosiloxane unit into an intermediate of controlled iteration in a single step, thereby significantly reducing the number of iterations. The four obtained 26-mers with molecular weights higher than 3400 bearing different Me₂SiO/Ph₂SiO sequences exhibit distinct thermal, structural, and mechanical properties, even though the substituents on the silicon atoms are simple methyl and phenyl groups. These results indicate that controlling the monomer ratio and sequence are both crucial in determining the physical properties of copolymerized polysiloxane (silicone) materials.

中文翻译：

离散和序列特异性低聚硅氧烷的构建方法

将分子级结构精度与宏观特性相结合的离散和序列特异性低聚物在聚合物和材料科学中引起了越来越多的关注。这项研究报告了一种简便的方法，通过将硅氧烷结构单元合并到 B(C ₆ F ₅ ) ₃ -催化一锅控制迭代。这些构建块能够在一个步骤中将明确定义的低聚硅氧烷单元合并到受控迭代的中间体中，从而显着减少迭代次数。获得的四种分子量高于 3400 的 26 聚体具有不同的 Me ₂ SiO/Ph ₂ SiO 序列，表现出不同的热、结构和机械性能，尽管硅原子是简单的甲基和苯基。这些结果表明，控制单体比例和顺序对于确定共聚聚硅氧烷（有机硅）材料的物理性能至关重要。

更新日期：2024-06-17

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