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The pure effects of branching architecture on crystallization and thermal properties were investigated using linear 2-arm and branched 4-arm poly(l-lactide) (2L and 4L, respectively) polymers having a wide range of number-average molecular weight (M n ) values of 5.0 × 10 3 –6.0 × 10 4 g mol −1 . 2L and 4L were synthesized by bulk ring-opening polymerization of l-lactide...
Ternary stereocomplex (TSC) crystallization of optically active polyesters, l-configured poly(l-2-hydroxybutanoic acid) [P(l-2HB)], d-configured poly(d-2-hydroxybutanoic acid) [P(d-2HB)] and poly(d-lactic acid) (PDLA) from the melt is reported. Ternary P(l-2HB)/P(d-2HB)/PDLA blends were prepared by solution-casting to have a fixed content (50 mol%) of l-configured P(l-2HB) and different contents of...
The crystallization behavior of the stereoblock copolymer of substituted and non-substituted poly(lactide)s, i.e., poly(d-2-hydroxybutyrate) and poly(l-lactide) chains having the opposite configurations [P(D-2HB)-b-PLLA] and the reference block copolymer of poly(d-2-hydroxybutyrate) and poly(d-lactide) chains with the identical configurations [P(D-2HB)-b-PDLA] was investigated. At the crystallizable...
The non-isothermally and isothermally crystallized stereodiblock copolymers of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) with equimolar l-lactyl and d-lactyl units and different number-average molecular weights (M n ) of 3.9 × 10 3 , 9.3 × 10 3 , and 1.1 × 10 4 g mol −1 , which are abbreviated as PLLA-b-PDLA copolymers, contained only stereocomplex...
Linear 1-arm and 2-arm poly(l-lactide) [i.e., poly(l-lactic acid) (PLLA)] polymers having relatively low number-average molecular weights (M n ) (≤5×10 4 gmol −1 ) were synthesized by ring-opening polymerization of l-lactide initiated with tin(II) 2-ethylhexanoate (i.e., stannous octoate) and coinitiators of l-lactic acid, 1-dodecanol (i.e., lauryl alcohol), and ethylene glycol...
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