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The isothermal crystallization kinetics and morphology of poly(ethylene terephthalate)–poly(ethylene oxide) (PET30–PEO6) segmented copolymer, and poly(ethylene terephthalate) (PET) and poly(ethylene oxide) (PEO) homopolymers have been studied by means of differential scanning calorimetry (DSC) and a transmission electron microscope (TEM). It is found that the nucleation mechanism and growth dimension...
A poly(acrylamidoglycolic acid-co-acrylamide) [poly(AAGA-co-AAm)] hydrogel was prepared by copolymerising 2-acrylamidoglycolic acid (AAGA) with acrylamide (AAm). The copolymer hydrogel composition and structure was characterised by FTIR spectroscopy and elemental microanalysis and found to contain 3.5 AAGA monomer units for each AAm monomer unit. This was similar to the monomer ratios used in the...
The interfacial properties of a homopolymer (polybutadiene (PB)) and a terpolymer (brominated poly(isobutylene-co-p-methylstyrene) (BIMS)) are reported. Neutron reflectivity was used to study the interfacial structure. The results were complemented by scanning transmission X-ray microscopy and atomic force microscopy, which were used to probe the morphology of these binary blends. Our results show...
An important feature in the cure of unsaturated polyester (UP)/styrene/thermoplastics system is the formation of a two-phase structure. Its final morphology is primarily determined by the phase separation process and the gelation resulting from the polymerization. In this study, the phase separation process during the cure of UP resins with thermoplastic additives was investigated by optical microscopy...
Copolymers of vinyl acetate and acid monomers were synthesized by emulsion polymerization and applied as shrinkage control additives in the polymerization of unsaturated polyester (UP) and styrene at low temperatures. The presence of acid groups on the copolymer chain changes the selectivity of the cobalt promoter, and in turn, the relative reaction rate in the thermoplastic-rich and the UP-rich phase...
A dilatometry and morphological study of the effect of the various thermoplastic additives on shrinkage control of unsaturated polyester (UP) resins cured at low temperatures is presented in this article. It was found that shrinkage control is closely related to the morphological changes during curing. There are two major transitions in the relationship of shrinkage and additive concentration that...
The thermal behavior and morphology of a diblock copolymer of polystyrene and poly(ferrocenyldimethylsilane) (PFS) (Mn=36 000, φPS=0.308) have been surveyed using small angle X-ray scattering and transmission electron microscopy. As cast films are partly crystalline. The crystal structure is seriously perturbed by the propensity of the molecules to microphase segregation. After annealing above the...
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