| 초록 |
Waterborne polyurethane dispersions were prepared by pre-polymer process using polyols, poly(dimethylsiloxane) (PDMS) and poly(tetramethylene adipate glycol) (PTAd) as a soft segment. Slightly lower tensile strength and Young’s modulus values were observed using PDMS up to the optimum content and after then dropped down rapidly. The adhesive strength significantly affected by polyol, PDMS molecular weight and polyol ratio. The adhesive strength increased with increasing PDMS content using low molecular weight PDMS (Mn=550, 6000). However, the adhesive strength of WP-3-550 retained almost original value with optimum PDMS content (6.64 mole%) with low molecular weight PDMS (Mn=550) after immersion in water for 48 hours. Thus maintaining the proper content of PTAd and PDMS polyol (Mn=550) the WBPU adhesive material can be used as an alternative of current solvent-based adhesives.. |
