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|Title:||Phase behaviour and modeling of low and high-solid biopolymer mixtures: A treatise||Authors:||PREETI SHRINIVAS||Keywords:||biopolymer mixtures, phase separation, glass transition||Issue Date:||22-Jun-2009||Citation:||PREETI SHRINIVAS (2009-06-22). Phase behaviour and modeling of low and high-solid biopolymer mixtures: A treatise. ScholarBank@NUS Repository.||Abstract:||
Part I of this thesis examines structural properties of mixtures of agarose, gelatin, and a lipid. Rationalization using a bicontinuous blending-law suggests presence of two continuous phases with gelatin exhibiting favourable relative affinity for solvent at increasing concentrations in the system, contradicting the central finding of a single value of the b p-factorb reported for de-swelled binary gels. Incorporation of a liquid/solid-like lipid phase weakened/reinforced the composite which was modeled using analytical expressions of isotropically dispersed soft/ rigid filler particles in a polymeric matrix.
Part II studies the structural behavior of amylose in the presence of glucose syrup. In contrast to industrial polysaccharides, amylose holds its structural characteristics unaltered at low-intermediate levels of co-solute. Thereafter, an early phase inversion to a co-solute dominated system occurs. Using the combined framework of the free volume / reaction rate theories two distinct glass transition temperatures are argued for proposing that the system is micro phase-separated, without reaching a state of molecular mixing.
|Appears in Collections:||Ph.D Theses (Open)|
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