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Molecular Weight Effect on the Dissolution Behavior of Polystyrene Films Using Fluorescence Technique

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In this study, we investigated the effect of molecular weight, M w on the dissolution behavior of pyrene labeled (P) polystyrene (PS) latex films using steady state fluorescence (SSF) technique. Here, pyrene was used as fluorescence probe to monitor the dissolution process. Seven different films were prepared from P-labeled PS latex dispersions with different molecular weight at room temperature. These films were then annealed at 200 °C to complete the film formation process before dissolution. Desorption of PS chains from the films into toluene–cyclohexane mixture was monitored simultaneously by observing the change in P fluorescence intensity, I P. A model including case I and case II diffusion kinetics was employed to quantify the fluorescence data observed from dissolving PS films. Relaxation constants, k 0, and dissolution coefficients, D d, of polymer chains were measured. Two different D d values (D d1 and D d2) were obtained and attributed to different molecular weight distribution in the film. It was also observed that both D d1 and D d2 values decreased by increasing molecular weight (M w) obeying the scaling law of D d ≈ M–n.
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Keywords: DISSOLUTION; FLUORESCENCE; MOLECULAR WEIGHT; POLYMER FILM; POLYSTYRENE

Document Type: Research Article

Publication date: December 1, 2012

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  • Journal of Colloid Science and Biotechnology is an international multidisciplinary peer- reviewed journal covering all aspects of colloid science including colloids preparation, characterization, structure-property relationships, spectroscopy, chemical and physical properties and applications of colloids in biotechnology, medicine and pharmaceuticals. This journal deals with interdisciplinary research areas of chemistry, physics, biology, materials science, polymer science, nanotechnology covering all topics related to colloids such as latexes, emulsions, suspensions, micellar systems, gels, composites, hybrids, surfactants, aerosols, foams, minerals, soft matter, microfluidics, encapsulation processes of active molecules, biomolecules, surfacial and interfacial processes, catalysis, electrochemistry, theoretical aspects, computer simulations and colloids in biotechnology and medicine.
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