Stereo-complex crystallization of poly(lactic acid)s in block-copolymer phase separation.
Block-copolymer containing a poly(L-lactic acid) (PLLA) segment was blended with pure poly(D-lactic acid) (PDLA) chain in chloroform solution and casted into the dried film. This method could form the stereocomplex (Sc) crystal of PLLA/PDLA within the nanometer-sized phase separation self-assembled by block-copolymer. Differential scanning calorimetry measurements of the prepared and annealed films gave the maximum achievable melting temperature of 245 °C, which was highest among those previously reported for PLA Sc-crystals. Surprisingly, all of added PDLA chains were Sc-crystallized, depending on the blend composition with block-copolymer containing PLLA.
Uehara
Hiroki
H
Karaki
Yusuke
Y
Wada
Shizuka
S
Yamanobe
Takeshi
T
D019344:Lactic Acid / Q000737:chemistry*; D044367:Phase Transition; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D013237:Stereoisomerism; D044366:Transition Temperature
D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide)