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The isothermal crystallization of isomorphic Poly(hexamethylene adipate-co-butylene adipate) [P(HA-co-BA)], with the HA unit content ranged from 100 to 45 mol%, forming the Poly(hexamethylene adipate) [PHA] type crystal was investigated with DSC, FTIR and WAXD. The BA units were found adopting their all-trans conformation in the crystalline phase of PHA type crystal. The inclusion of the BA units...
It has been investigated the effects of poly(butylene succinate) (PBS) component on the fractionated crystallization, crystalline structure, and spherulite morphology of polymorphic poly(butylene adipate) (PBA) with melting temperature lower than that of PBS in their miscible binary blends. Fractionated crystallization of the PBA component occurs upon blending with PBS depending on the content and...
The crystallization behavior has been investigated for poly(hexamethylene sebacate-co-hexamethylene suberate)s [P(HSe-co-HSu)] and poly(hexamethylene suberate-co-hexamethylene adipate)s [P(HSu-co-HA)] copolyesters by differential scanning calorimeter (DSC), wide angle X-ray diffraction (WAXD) and Fourier transform infrared (FTIR) spectrometer. Cocrystallization of comonomer units was found in the...
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...
The crystallization kinetics, morphology and crystalline structure of biodegradable poly(ethylene adipate) (PEA) with high and low molecular weights (HMW, LMW) were systematically investigated. The crystallization kinetics obtained from differential scanning calorimetry analysis indicated that both the primary and secondary crystallizations occur during the isothermal and non-isothermal crystallization...
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...
Solid-state structures and crystallization kinetics were compared between poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [PHB-HV] and PHB/PHB-HV blends exhibiting the cocrystallization. As cocrystallizable blends, both the blends showing complete cocrystallization, i.e. the PHB content in the crystalline phase is the same as that of the whole blends, and the blends forming a PHB-rich crystalline phase...
This study describes in situ observation of crystallization in a spherulite of blends of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [PHBV] and poly(3-hydroxybutyrate-co-3-hydroxypropionate) [PHBP] by FTIR microscopy. In order to trace the crystallization processes of blend components separately, PHBV was deuterated. The C–D and CO stretching bands in the IR spectra, respectively, show the crystallization...
Biodegradable aliphatic poly(butylene succinate-co- -caprolactone) (PBSCs) were synthesized through a polycondensation with titanium tetraisoproxide (TTP), diphenylphosphinic acid (DPPA) and stannous octoate (Sn(Oct) 2 ) as the novel co-catalysts. By means of gel permeation chromatography (GPC) and nuclear magnetic resonance spectrometer (NMR), it was revealed that the PBSC copolyesters had...
The phase structure of the miscible blends of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-HV) has been analyzed through DSC measurements and the observations of spherulite growth. Melting temperature and spherulite growth rate of the blends changed depending on the blend composition, which indicates that the extent of phase segregation increases as the HV content...
Solid structures of the compositionally fractionated bacterial poly(3-hydroxybutyric acid-co-3-hydroxypropionic acid)s [P(3HB-co-3HP)], bearing much narrower comonomer compositional distributions, were studied by high-resolution solid-state 13 C n.m.r. 1 H– 13 C cross-polarization relaxation behaviour (T CH and T 1ρH ) of chain-carbon nuclei was found to...
Two different kinds of natural poly(3-hydroxybutyric acid-co-3-hydroxypropionic acid)s [P(3HB-co-3HP)] with individual 3HP comonomer contents of 36.5 and 68.1 mol.% were biosynthesized by the bacteria Alcaligenes latus, fed on the cosubstrates of (R)-3-hydroxybutyric acid (3HBA) and 3-hydroxypropionic acid (3HPA). Employing the mixed chloroform/n-heptane solvent, the bacterial products were found...
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