|Characterization and Degradation Behavior of Segmented Poly(urethaneurea)s
Prepared from Lysine-Based Diisocyanate
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, Japan
Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
JASRI, Sayo, Hyogo, Japan
Nippon Gomu Kyokaishi,(2006),79(4),219-224 Original Paper in Japanese
Biodegradable segmented poly(urethanerea)s (SPUU's) were synthesized by a standard two-step prepolymer method using lysine-based diisocyanete and polycaprolactone diol (PCL) as a soft segment combined with 1,4-butanediamine (BDA) as a hard segment.
Thermal analysis by differential scanning calorimetry, wide angle X-ray diffraction (WAXD), and small angle X-ray scattering measurements revealed that the relative ratio of PCL and BDA segments in SPUU changed the crystallinity of PCL segment and the microphase separation structure consisted with soft and hard segments. Diffraction pattern in WAXD due to the crystal of PCL components disappeared in the case of SPUU containing 71% of PCL segment. Furthermore, the SPUU with 71% PCL segment showed good elastic properties because the crystallization of PCL component was completely inhibited by the strong aggregation of hard segments. BOD biodegradation test was performed by dipping SPUU into activated sludge for 30 days. Higher degradation rate was observed in the SPUU with higher content of PCL segment.
(Received on August 22, 2005)
(Accepted on January 11, 2006)
segmented poly(urethaneurea)s, lysine-based diisocyanate, biodegradation, microphase separation