Solvent diffusion in amorphous polymers: Polyvinyl acetate-toluene system

Diffusion of Small Molecules in Amorphous Glassy Polymers

Blending Behavior of Polysulfone, Polyvinyl Acetate & Amines in Dimethyl Acetamide Solvent

In this paper, research will be carried out to classify the blending behavior of glassy and rubbery polymer in solvent with amines. Commercially preface of a polymer prepared from a new monomer is uncertain and enormously expensive. A strategy to introduce new products into the market without a large investment is to take dissimilar polymers, amines and blend them together to make a new product...

Lipase Mediated Isoamyl Acetate Synthesis in Solvent-Free System Using Vinyl Acetate as Acyl Donor

Synthesis of isoamyl acetate, a flavour ester extensively used in food industry, has been carried out in a solvent-free system. In the present study, an attempt has been made to enhance the isoamyl acetate synthesis yield by transesterification of isoamyl alcohol with vinyl acetate using immobilized Rhizopus oryzae NRRL 3562 lipase. In the present synthesis, substrates had no inhibitory effect ...

Chappter 6. Diffusion of Gases in Amorphous Polymers: The Monte Carlo Void Method

We propose a method for studying diffusion in amorphous structures based on biased random walk in the free volume extracted from a polymer (“the Monte Carlo Void Method.”) We analyze a number of simple free volume structures not derived from realistic polymers and show that the biased random walk method is offering intuitively realistic description of the particle motion and present a framework...

Flow behaviour of polyvinyl alcohol (PVOH) modified blends of polyvinyl acetate (PVAc)/natural rubber (NR) latexes

During compounding processes, polymer latexes are mixed with various colloidal systems (in particular, PVOH) or surface-active agents to modify the flow behaviour in order to suit the manufacturing process. In this study, the flow behaviour of aqueous dispersed PVAc, NR and different mixed dispersions were investigated both in the absence and presence of PVOH as flow modifier, using an Ostwald ...