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We develop a new method to prepare block copolymer vesicles with high loading capacity of drugs which can then be released in a controlled manner. The block copolymers, including PS-b-PAA, PS-b-PEO, and biocompatible PCL-b-PEO, can directly self-assemble into vesicles in aspirin and encapsulate aspirin by solvent annealing with ethanol which imparts mobility to the originally solid block copolymers...
In order to investigate the effect of comonomer-unit composition and its distribution of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HHx)] on the miscibility of its blend with poly(ethylene oxide) (PEO), as-bacterially synthesized and well-fractionated P(3HB-co-3HHx)s with different 3HHx unit content were blended with PEO at different content. It is found that the miscibility...
In order to clarify the relationships between comonomer-unit compositional distribution and physical properties of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HHx)], the comonomer-unit composition and its distribution as well as their effects on the physical properties of P(3HB-co-3HHx) have been studied. A series of fractions with very different comonomer-unit composition but...
By focusing on a range of fractions of medium-chain-length polyhydroxyalkanoates (mcl-PHA), a more in-depth understanding of the thermal properties and the crystalline structure has been gained. Dual-mode melting was observed for all the fractionated samples. Further DSC analysis revealed that such phenomenon was due to the presence of two crystalline phases (phase I and phase II), forming at different...
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