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Elastomeric composites are increasingly recognized as promising materials for thermal insulation applications in building technologies, owing to their unique blend of mechanical flexibility, thermal resistance, and durability. Utilizing sheet molding compounding (SMC), a versatile and efficient manufacturing method, enables the production of high-performance elastomeric fiber composites. In this study, we focus on formulating hydroxy-terminated polydimethylsiloxane (PDMS) composites reinforced with glass micro-balloons (GMBs). These formulations are designed to not only provide the necessary rheological properties for SMC processing but also to impart desirable thermomechanical characteristics to the cured PDMS composites. Our investigation explores the impact of filler content on the cure kinetics, rheological behavior, thermal insulation, and hardness properties of the PDMS composites. PDMS formulations with GMB contents below 40 wt.% are shown to exhibit favorable shear-thinning behavior for SMC processing. Thermal conductivity measurements of the PDMS composites are conducted using the transient plane source (TPS) technique showing a 17% reduction in thermal conductivity at a 30 wt.% GMB content. In addition, Shore A scale hardness measurements showed a 590% durometer increase at 30 wt.% GMB content. We conclude with a demonstration for molding PDMS/GMBs SMC composites that incorporate glass fibers (GFs) into a desired shape, followed by thermal curing. Insights gained from this work would guide the development of high-performance, food safe PDMS composites with desirable thermal insulation for home appliances.

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Development and Sheet Molding Compound (SMC) of Polydimethylsiloxane Composites for Thermal Insulation Applications

  • 会议论文

  • 发表日期：

    2026年

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  • Nadim Saleh Hmeidat,
  • Steve Bullock,
  • Philip R. Barnett,
  • Umesh Marathe,
  • Steven Guzorek,
  • Som Shrestha,
  • Sana Elyas,
  • Christopher Hartnett,
  • Patrik T. Rydin,
  • Ahmed Arabi Hassen

摘要

Elastomeric composites are increasingly recognized as promising materials for thermal insulation applications in building technologies, owing to their unique blend of mechanical flexibility, thermal resistance, and durability. Utilizing sheet molding compounding (SMC), a versatile and efficient manufacturing method, enables the production of high-performance elastomeric fiber composites. In this study, we focus on formulating hydroxy-terminated polydimethylsiloxane (PDMS) composites reinforced with glass micro-balloons (GMBs). These formulations are designed to not only provide the necessary rheological properties for SMC processing but also to impart desirable thermomechanical characteristics to the cured PDMS composites. Our investigation explores the impact of filler content on the cure kinetics, rheological behavior, thermal insulation, and hardness properties of the PDMS composites. PDMS formulations with GMB contents below 40 wt.% are shown to exhibit favorable shear-thinning behavior for SMC processing. Thermal conductivity measurements of the PDMS composites are conducted using the transient plane source (TPS) technique showing a 17% reduction in thermal conductivity at a 30 wt.% GMB content. In addition, Shore A scale hardness measurements showed a 590% durometer increase at 30 wt.% GMB content. We conclude with a demonstration for molding PDMS/GMBs SMC composites that incorporate glass fibers (GFs) into a desired shape, followed by thermal curing. Insights gained from this work would guide the development of high-performance, food safe PDMS composites with desirable thermal insulation for home appliances.