Date of Publication
2005
Document Type
Master's Thesis
Degree Name
Master of Science in Chemistry
Subject Categories
Chemistry
College
College of Science
Department/Unit
Chemistry
Thesis Adviser
Anamy C. Paano
Defense Panel Chair
Jaime Raul O. Janairo
Defense Panel Member
Julius O. Maridable
Christina A. Binag
Abstract/Summary
Kappa-carrageenan, a natural macromolecular carbohydrate material from renewable resources, is widely used in many applications. In this study, blends of - Carrageenan (Carr) with poly(4-vinylpyridine-co-vinyl acetate) (P4VPy-VAc) and poly(4-vinylpyridine-co-methacrylonitrile) (P4VPy-MAN) were prepared by allowing both components to interact by acid-base interaction in DMF solution. Carr is a linear polysaccharide with sulfate moieties and under acidic condition, it can act as a proton donor due to the accessibility of the hydrogen in the sulfate group. The nitrogen in the pyridine group of P4VPyVAc or PrVPyMAN acts as the proton acceptor. The blends showed good compatibility -carr and copolymers of poly(4- vinylpyridine). Surface morphology, thermal, and thermomechanical properties of the blends were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), differential thermal analysis (DTA), and thermomechanical analysis (TMA). Results of the thermal shrinkage tests indicate that blends containing higher - Carr and lower 4VPy content exhibit maximum shrinkage at higher temperatures but lower shrinkage stress. Blends of -Carr/P4VPy-VAc exhibit higher shrinkage stress compared with -Carr/P4VPy-MAN. Evaluation of copolymer compositions of 4-vinylpyridine/vinyl acetate and 4- vinylpyridine/methacrylonitrile co-monomers show that copolymer prepared at varying feed ratios was found to be rich in 4VPy indicating that self-propagation of 4VPy predominates over cross-propagation with MAN and VAc respectively.
Abstract Format
html
Language
English
Format
Electronic
Accession Number
CDTG003997
Shelf Location
Archives, The Learning Commons, 12F Henry Sy Sr. Hall
Physical Description
1 computer optical disc ; 4 3/4 in.
Keywords
Vinyl acetate; Methacrylonitrile; Supramolecular chemistry; Macromolecules; Chemical reactions; Reactivity (Chemistry)
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Recommended Citation
Balgua, C. T. (2005). Synthesis of compatible blends of k-carrageenan with poly (4-vinylpyridine-CO-vinyl acetate) and poly (4-vinylpyridine-CO-methacrylonitrile). Retrieved from https://animorepository.dlsu.edu.ph/etd_masteral/3342
