Effects of copolymer segment length and reversible deformation on the molecular surface structure of polyurethane — Ella Amitay-Sadovsky (2003) | RDL Network
Effects of copolymer segment length and reversible deformation on the molecular surface structure of polyurethane
Article 2003 en
Authors
EA
Ella Amitay-Sadovsky
KK
K. Komvopoulos
RW
Robert S. Ward
Abstract
1 min read
The surface molecular structure and the deformation mechanisms of two polyurethane (PUR) short-segmented copolymers were studied by sum frequency generation (SFG) vibrational spectroscopy. These PURs differ only in the length of their hard segment. Surface deformation was induced by cyclically stretching the PUR films to a macroscopic elastic elongation. Results for both PUR compositions indicate that the upward orientation of the methylene groups increases with elongation and decreases upon relaxation. The surface of the stretched PUR films with shorter hard segments exhibited irreversible deformation at the molecular level. This produced a surface composition similar to that of PUR with longer hard segments that deformed only elastically after three stretching cycles. This behavior indicates that the surface structure of PUR copolymers can be controlled by mechanical manipulation or by modification of the copolymer segment length.
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