Preliminary research of effect of pentaerythritol on build-up pattern of mechanical properties of HTPB-based polyurethane

Hydroxyl-terminated polybutadiene (HTPB) thermosetting polyurethane (PU) elastomer is an excellent polymer material to form network and determine mechanical properties of polymer composites. However, the composition needs to be improved to reduce brittleness in polymer composites with particle conte...

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Bibliographic Details
Main Author: Restasari, Afni
Format: Conference Proceeding
Language:English
Subjects:
Accumulation
Crosslinking
Curing
Elastomers
Hardness
Mechanical properties
Modulus of elasticity
Particulate composites
Polymer matrix composites
Polymers
Polyurethane resins
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Summary:Hydroxyl-terminated polybutadiene (HTPB) thermosetting polyurethane (PU) elastomer is an excellent polymer material to form network and determine mechanical properties of polymer composites. However, the composition needs to be improved to reduce brittleness in polymer composites with particle contents of more than 85%. A powerful way to reach this purpose is by adding a cross-linker compound that has four branches, namely pentaerythritol. Therefore, this work aims to investigate the effect of pentaerythritol on build-up pattern of mechanical properties of HTPB-based polyuerthane. In this study, HTPB-PU-PE was fabricated by addition of 1% pentaerythritol into polyurethane (HTPB-PU). Shore A durometer was used to measure hardness of which converted to Young Modulus by Landel Equation until 3 weeks after curing. Results show that by addition of pentaerythritol, Young Modulus and hardness of HTPB-PU are increased 150% and 86%, respectively. However, distinguished patterns shown in the build-up of those mechanical properties suggests that the strength of cross-link points dominates the role of pentaerythritol, over the number of cross-link points, in constructing mechanical properties in early period after curing.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0104773