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When poly(d-lactide) (PDLA) is mixed with poly(l-lactide) (PLLA) of similar molecular weight and crystallized from the melt in ultrathin films (30 nm), hexagonal single crystals are obtained at the equimolar composition, and triangular single crystals at non-equimolar compositions. Here, stereocomplexes are formed by blending PDLA with a PLLA incorporated as the central block of a triblock copolymer...
This feature article summarizes the comprehensive studies of hierarchical structures formed in poly(lactic acid) (PLA)/poly(ethylene glycol) (PEG) blends. This system is of interest because of not only properties improvement but also their use as biodegradable materials. In general, crystalline polymers frequently form various kinds of structures in different levels of size scale. At the nanometer...
The effect of high pressure on the higher-order structures of poly(oxyethylene) (PEG) crystallites in poly(d,l-lactide)/poly(oxyethylene) (PDLLA/PEG) blends during melting and recrystallization was investigated by in situ small-angle X-ray scattering (SAXS) measurements. It was found that melting temperature (Tm) increases at 50 MPa in accordance with the prediction by the Clausius–Clapeyron...
Direct determination of the discrete distribution for crystalline lamellar thickness has been performed for poly(d,l-lactic acid)/poly(oxyethylene) (PDLLA/PEG) blends by conducting small-angle X-ray scattering (SAXS) measurements using synchrotron radiation. The PDLLA used was an random (racemic) copolymer of bio-based poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) with the lactide monomer...
Higher-order crystalline structures in blends of poly(lactide)/poly(oxyethylene) (PLA/PEG) were investigated using small-angle X-ray scattering (SAXS). For this purpose, the fact that two polymers are both crystalline makes situation much complicated. To simplify, we used non-crystalline PLA: poly(d,l-lactide) (DLPLA), which is a racemic copolymer comprising d- and l-lactide moieties. Higher-order...
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