English Abstract

Influence of Side Group Contents of Polycarbonate Glycol on Aggregation Structures and Mechanical Properties of Polyurethane Elastomers

Ken KOJIO *1
Mutsuhisa FURUKAWA *2
Motonori MIZOKAMI *1
*1:Graduate School of Engineering, Nagasaki University, Bunkyo-machi, Nagasaki, Japan
*2:Professsor Emeritus, Nagasaki University, Bunkyo-machi, Nagasaki, Japan
Nippon Gomu Kyokaishi,(2012),85(5),151-156 Original Paper in Japanese

Polycarbonate (PC) glycol synthesized from 1,6-hexanediol and 2-butyl-2-ethyl-1,3-propanediol (BEPD) with various ratios were employed to control the mechanical property of PC-glycol-based polyurethane elastomers (PUEs).
The PUEs were synthesized from PC-glycol, 4,4’-diphenylmethane diisocyanate and 1,4-butanediol by a one-shot method. The degree of microphase separation became weaker with an increase in the BEPD content. This trend results in a decrease in Young’s modulus due to the lack of the formation of crystallized hard segment domains in the PUEs. Tensile strength and strain at break decreased and increased with increasing BEPD content, respectively.
This result clearly suggests that butyl and ethyl groups of the BEPD part suppressed the packing of the soft segment under elongation.

Keywords: Polycarbonate Glycol, Side Groups, Aggregation Structure, Mechanical Properties