TY - JOUR
T1 - Crystal Structure of Stereocomplex of Poly(L-lactide) and Poly(D-lactide)
AU - Okihara, Takumi
AU - Tsuji, Masaki
AU - Kawaguchi, Akiyoshi
AU - Katayama, Ken Ichi
AU - Tsuji, Hideto
AU - Hyon, Suong Hyu
AU - Ikada, Yoshito
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1991/3/1
Y1 - 1991/3/1
N2 - An equimolar mixture of poly (L-lactide) and poly(D-lactide) was crystallized into a stereocomplex whose crystal system is triclinic (P1) with cell dimensions: a = 0.916 nm, b = 0.916 mm, c (chain axis) = 0.870 nm, a = 109.2°, β = 109.2°, and y = 109.8°. In the unit cell, a poly(L-lactide) segment and a poly (D-lactide) segment are contained as a pair and packed laterally in parallel fashion. The L- and D-poly(Iactides) in the complex take a 31helical conformation, which is a little extended from a 103 helix in the homopolymer crystal with the α-form. Homopolymers are also able to take the 31helical conformation and form the β-form crystal. The 31helix in the homopolymer crystal is less stable than the 103one, and hence the β-form is easily transformed to the a-form by annealing.
AB - An equimolar mixture of poly (L-lactide) and poly(D-lactide) was crystallized into a stereocomplex whose crystal system is triclinic (P1) with cell dimensions: a = 0.916 nm, b = 0.916 mm, c (chain axis) = 0.870 nm, a = 109.2°, β = 109.2°, and y = 109.8°. In the unit cell, a poly(L-lactide) segment and a poly (D-lactide) segment are contained as a pair and packed laterally in parallel fashion. The L- and D-poly(Iactides) in the complex take a 31helical conformation, which is a little extended from a 103 helix in the homopolymer crystal with the α-form. Homopolymers are also able to take the 31helical conformation and form the β-form crystal. The 31helix in the homopolymer crystal is less stable than the 103one, and hence the β-form is easily transformed to the a-form by annealing.
UR - http://www.scopus.com/inward/record.url?scp=0026123270&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026123270&partnerID=8YFLogxK
U2 - 10.1080/00222349108245788
DO - 10.1080/00222349108245788
M3 - Article
AN - SCOPUS:0026123270
SN - 0022-2348
VL - 30
SP - 119
EP - 140
JO - Journal of Macromolecular Science, Part B
JF - Journal of Macromolecular Science, Part B
IS - 1-2
ER -