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Structural studies on two segmented polyurethanes prepared from modified oleic acid soft segments and butane diol/diphenylmethane diisocyanate hard segments, were performed. Polyurethanes were thermoplastic elastomers with 50% and 70% soft segment concentration (SSC) for TPU-50 and TPU-70, respectively. DMA revealed the co-continuous morphology in TPU-50 and dispersed hard domains in the soft matrix...
Morphology of 4,4′-dicyclohexylmethane diisocyanate–poly(tetramethylene oxide) (PTMO)–diethyltoluenediamine based poly(urethane urea) (PUU) elastomers is investigated by atomic force microscopy (AFM) and compared with elastic modulus data measured from AFM-enabled indentation, dynamic nanoindentation (nanoDMA), and dynamic mechanical analysis (DMA). These measurements highlight the effect of altering...
The morphologies of two crystalline polymers, polyethylene terephthalate (PET) and poly(vinylidene fluoride-co-tetrafluoroethylene) [P(VDF-TFE)], were probed under nanolayer confinement using forced assembly multilayer film coextrusion. This multilayer system was used as a platform to investigate the effect of nanolayer coextrusion, biaxial stretching, and isothermal melt recrystallization on the...
We investigated the morphology of a series of thermoplastic polyurethanes (TPUs) based on polyisobutylene (PIB) diol. The TPUs were synthesized using PIB diol with the molecular weight of 2000 g/mol as the soft segment, with different chemical structures and weight fraction of the hard segment. Thermal properties and microphase separated structures of these TPUs were characterized by thermal analysis...
Poly(butylene succinate) (PBS) is a promising polymer for the production of bio-based and biodegradable materials. This study focuses on the development of novel tunable morphological states based on ternary blends comprising PBS. The other biodegradable polymers are selected from a set of poly(lactic acid) (PLA), poly(butylene adipate-co-terephthalate) (PBAT), and polycaprolactone(PCL). Three completely...
In this study, the influence of rheological and morphological properties on the foaming behaviour of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymers and their composites with PMMA modified silica nanoparticles is discussed. The blowing agent was carbon dioxide. Cylindrical and lamellar types of PS-b-PMMA diblock copolymers with different molecular weights were chosen in...
The dynamic mechanical properties of poly(styrene-co-Na tiglate) PSTANa, poly(styrene-co-Na methacrylate) PSMANa, and poly(styrene-co-Na acrylate) PSAANa ionomers were investigated to know the effect of the number of methyl groups of the acrylate unit on the mechanical properties and morphology of those ionomers. It was found that the ionic modulus of the PSTANa ionomers was much lower than that of...
In this study, multilayer films of sPS–PPS (syndiotactic Polystyrene and Polyphenylene sulfide blend) against P4MP1 [Poly(4-Methylpentene-1)] with various compositions and layer thicknesses were prepared by a layer multiplying coextrusion process. Incorporating the PPS into sPS layers before coextrusion produced pores in the sPS layers upon a post-extrusion, uniaxial orientation. Confined crystallization...
Model cellulose acetate (CA) membranes were prepared by casting their solutions containing different polymer compositions and formamide (cosolvent) to acetone (solvent) ratios (FAR) followed by their precipitation in a water bath. The selected system provided the opportunity of changing the membranes morphology systematically via phase separation by nucleation and growth of polymer lean phase, spinodal...
Dissipative particle dynamics (DPD) combined with Monte Carlo (MC) tracer diffusion calculations are used to study phase separation and diffusion within hydrated (amphiphilic) alternating multi block co-polymer membranes. The co-polymers are composed of hydrophobic (A) and hydrophilic (C) fragments. The hydrophobic A block length is alternating short (x A fragments) and long (y A fragments). One repeat...
The crystalline morphology formed in binary blends of poly(ε-caprolactone)- block-polyethylene (PCL-b-PE) copolymers and PCL homopolymers has been examined using synchrotron small-angle X-ray scattering (SR-SAXS) and differential scanning calorimetry (DSC) as a function of the homopolymer fraction in the blend. The PE block crystallized first on quenching from a lamellar microdomain structure to set...
The coarsening of polymer mixtures is an important route towards major morphology modification in multiphase polymer systems. To date however the coarsening of ternary systems has not been significantly examined. In this study the phase coarsening mechanism via annealing for partial wetting, and complete wetting morphologies in ternary polymer blends is characterized. This is a route towards the examination...
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