SAMPE Journal - May/June 2023 - 36
FEATURE
POLYSILOXANE
RESINS
Polysiloxane Resins Formulated for
High-Temperature Applications
Jarrod J. Buffy1, Yanan Hou2
Colin Yee2
, Wei Li2
Ben Rech3
,
,
, William Fahy3
,
Hao Wu3, and Joseph H. Koo2,3
1Techneglas LLC, Perrysburg, OH
2
The University of Texas at Austin, Austin, TX
3
KAI, LLC, Austin, TX
Email: jbuffy@techneglas.com
ABSTRACT
Fiber reinforced composite materials are widely used in the aerospace industry due to their high strength to
weight ratio. One of their applications is as an ablative material placed at the outermost layer of a thermal
protection system (TPS). A TPS requires the ablative material to have low density, low thermal conductivity,
high temperature resistance, and formation of a stable and high shear strength char. This paper introduces a
carbon fiber (CF) reinforced polysiloxane Ultra High Temperature Resin (UHTR) composite material processed
and fabricated in a laboratory environment. The fabrication method of this material is illustrated in detail.
Thermal, ablation, flammability, and mechanical properties of the CF/UHTR material are characterized and
compared to a carbon fiber phenolic (CF/Ph) composite material, MX4926, manufactured by Solvay-Cytec.
In this study, the carbon fiber used to make the CF/UHTR material is a PAN-based 8-harness fabric provided
by Hexcel. The polymer matrix, UHTR, is a colorless semi-solid polysiloxane resin manufactured by Techneglas
LLC. Raw materials are firstly made into CF/UHTR prepreg sheets through a hot-melt process and then
compression molded into molding compound (MC) samples or two-dimensional (2D) laminates by a hot press.
All samples for testing are post cured in a programmable oven at 350°C for 2 hours. The density of the fullycured
material is measured by the water displacement method. Thermal stability, flammability, and ablation
properties of the material are characterized using thermogravimetric analysis (TGA), microscale combustion
calorimeter (MCC), and oxyacetylene test bed (OTB). Testing results of the CF/UHTR material are compared
with the commercial model ablative material, MX4926.
36 | SAMPE JOURNAL | MARCH APRIL 2023
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SAMPE Journal - May/June 2023
Table of Contents for the Digital Edition of SAMPE Journal - May/June 2023
Contents
SAMPE Journal - May/June 2023 - Cover1
SAMPE Journal - May/June 2023 - Cover2
SAMPE Journal - May/June 2023 - Contents
SAMPE Journal - May/June 2023 - 2
SAMPE Journal - May/June 2023 - 3
SAMPE Journal - May/June 2023 - 4
SAMPE Journal - May/June 2023 - 5
SAMPE Journal - May/June 2023 - 6
SAMPE Journal - May/June 2023 - 7
SAMPE Journal - May/June 2023 - 8
SAMPE Journal - May/June 2023 - 9
SAMPE Journal - May/June 2023 - 10
SAMPE Journal - May/June 2023 - 11
SAMPE Journal - May/June 2023 - 12
SAMPE Journal - May/June 2023 - 13
SAMPE Journal - May/June 2023 - 14
SAMPE Journal - May/June 2023 - 15
SAMPE Journal - May/June 2023 - 16
SAMPE Journal - May/June 2023 - 17
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SAMPE Journal - May/June 2023 - 19
SAMPE Journal - May/June 2023 - 20
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SAMPE Journal - May/June 2023 - Cover3
SAMPE Journal - May/June 2023 - Cover4
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