Studies on Molecular Weight Distribution and Functional Properties of Oligo, Polymeric Carbosilanes in Pyrolysis Polycondensation of Polydimethylsilane

IF 3.3 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2025-06-23 DOI:10.1007/s12633-025-03363-y

G. Santhana Krishnan, A. Keerthana, M. Shinan

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引用次数: 0

Abstract

The evolution of molecular masses and their dispersity, functional properties of oligo and polymeric carbosilanes in an extended pyrolysis-polycondensation are investigated. The results reveal that the formation of two carbosilane fractions viz., oligo, polymeric carbosilanes, distinctively different in molecular structure with varying average molecular weights and dispersity (725–2160 g/mol and 1580–4470 g/mol, 2.83–3.0). Infrared and nuclear resonance data confirmed the structural formation as a function of process temperature, pressure and reaction time. Thermal data indicated that ceramic yield of oligo and polymeric carbosilane to be higher than 45% wt. and 60% wt. Solution viscometric measurements report that dynamic viscosity as 1.28–8.26 mPa.s and 4710 mPa.s at 25 °C for PCS solution in dilute and high concentration regimes, respectively. Thermal and rheological studies established the desirable functional properties such as ceramic yield and rheological characteristics suitable for fiber spinning and resin matrix applications.

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聚二甲基硅烷热解缩聚过程中低聚碳硅烷分子量分布及功能特性研究

研究了低聚碳硅烷和聚合碳硅烷在扩展热解缩聚过程中分子质量的演变及其分散性和功能特性。结果表明：碳硅烷形成了低聚碳硅烷和聚合碳硅烷两种不同的碳硅烷组分，其分子结构明显不同，平均分子量和分散度分别为725 ~ 2160 g/mol和1580 ~ 4470 g/mol，分别为2.83 ~ 3.0。红外和核磁共振数据证实了结构的形成是工艺温度、压力和反应时间的函数。热数据表明，低聚碳硅烷和聚合物碳硅烷的陶瓷产率分别高于45%和60%。溶液粘度测量结果表明，溶液的动态粘度为1.28-8.26 mPa。s和4710mpa。在25°C下，PCS溶液在稀释和高浓度下分别为s。热学和流变学研究确定了理想的功能特性，如陶瓷产率和流变学特性，适用于纤维纺丝和树脂基体应用。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.