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How can the degree of branching influence the lyotropic properties of amphiphilic block copolymers? In order to provide a qualitative answer to this question, we have prepared a library of poly(propylene sulfide)-bl-poly(ethylene glycol) (PPS–PEG) block copolymers, varying the hydrophobic block (PPS) length and its branching degree and thus producing diblock, triblock (that can be seen as two-armed...
Another natural biopolymer, sodium alginate, has been electrospun from aqueous solution by blending with a non-toxic, biocompatible, synthetic polymer poly(ethylene oxide) (PEO). The interaction between sodium alginate and PEO has been evidenced by FTIR and conductivity change, which is thought to be the main reason for the successful electrospinning. The solution properties of sodium alginate/PEO...
The phase structure and thermal transition of acrylic fibres have been investigated at several temperature increments from 22 to 200°C. Two glass transition temperatures at 82 and 140°C have been identified and corresponded to the structural transitions of the paracrystalline and amorphous regions, respectively. These experimental observations give strong evidence to support the limited two-phase...
High temperature wide-angle X-ray diffraction (HTWAXD) has elucidated the differences in the structural changes in undrawn and crimped sulfonated poly(ethylene terephthalate) (SPET) fibres during heating from 230°C through melting. Both the heat-induced crystals and the drawing-induced crystals in the undrawn and crimped SPET fibres are triclinic. The HTWAXD data suggest that different morphologies...
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