Polyvinyl Acetate Polymer Research Articles

Acrylic Terpolymer-Based Blends with Improved Properties

Abstract Blending of acrylic terpolymer (AT) with vinyl acetate-vinyl chloride (VAc-VC) copolymer, polyvinyl alcohol (PVA) polymer, and polyvinyl acetate (PVAc) polymer, respectively, resulted in sealant compositions with improved properties and enhanced outdoor weathering resistance. The morphology of these blends was studied by SEM, energy-dispersive x-ray analysis (EDXA), and DSC. The blends are heterogeneous and consist of a continuous phase which is either pure or mixed AT and a particulate phase having the morphology of the added component. The particulate phase of AT and AT-(VAc-VC) copolymer blends contains mixed AT, whereas that of AT-PVA and AT-PVAc does not. The AT-based blends have generally improved mechanical properties (e.g., ultimate tensile strength, adhesive strength). The improvement in mechanical properties is particularly strong in mixtures of AT with (VAc-VC) copolymer, probably because the added component has greater specific interaction capabilities with AT than the polymers incorp...

Intensity of mechanical action and mechanical degradation of rigid polymers

The authors have investigated the relation between the degradation of rigid carbon-chain polystyrene, polyvinyl acetate, and polymethyl methacrylate polymers with the kinetics of mechanical degradation during vibromilling. They determine the critical value of the intensity necessary for the onset of the degradation process.

Durable Non-Reactive Flame-Retardant Finishes for Cotton

One of the properties of all fiber-reactive, flame-retardant finishes for cottons is reduced fabric tear strength which results in reduced wear life. Decreased mobility within the fabric structure due to cross-linking reactions of the finish is the cause of tear strength losses. Currently available non-reactive finishes have limited durability to laundering. Tris(2,3-dibromopropyl) phosphate, combined with small amounts of polyvinyl chloride, polyvinyl acetate, or acrylic polymers and applied to fabrics or garments from organic solvents, provides flame resistance to cotton fabrics which is durable to 15 accelerated mobile launderings.

Solution properties of polyvinylacetate by thermoelectric measurements

An unmodified model 301 Mechrolab osmometer is used to determine the molecular weight of a series of polyvinylacetate polymers of relatively low degrees of polymerization in acetone, benzene, carbon tetrachloride, chloroform, and methanol. Anomalous results were obtained with chloroform. The solute–solvent parameter μ1 and molecular weight are calculated with the Flory–Huggins theoretical equation.

Modification of the adhesion properties of synthetic fibres by radiation-grafting of fluoro-olefins

The characteristic features of the adhesion properties of fibres having been grafted with polystyrene, polyvinyl acetate and other polymers had been reported earlier [1, 2]. This report deals with the study of the influence of grafting hexafluoropropylene (C 3F 6) and trifluorochlorethylene (C 2F 3Cl) by polymerization on the adhesion properties of orientated polycaproamide (PC), polyethylene terephthalate (PET) and polypropylene (PP) fibres. The polyfluoro-olefins have a particularly valuable complex of physical and chemical properties due to the high negative electrical charge of the fluorine atom and the large bond energy with the C-atom. They are non-miscible with the majority of polymers.

Use of dimaleimides as accelerators for the radiation‐induced vulcanization of hydrocarbon polymers. Part II. Synthetic rubbers and saturated polymers

AbstractThe effect of m‐phenylenedimaleimide on the rate of cross linking of synthetic rubbers, polyvinyl acetate, polyvinyl chloride, polyethylene, and other polymers, under the action of ionizing radiation is described. The dose reduction factor for equivalent degrees of crosslinking obtained with and without the maleimide varies from 10 to 25 for the synthetic rubber. Further evidence is given to show that maleimides sensitize the vulcanization of unsaturated polymers, principally by copolymerization, and certain saturated polymers containing labile atoms, by a transfer mechanism.

Dielectric Studies of the Polymer Polyvinyl Acetate in the Molten State

Dielectric Studies of the Polymer Polyvinyl Acetate in the Molten State

Adhesion. III. Adhesion of polymers to cellulose and alumina

AbstractA relationship between tack temperature and molecular weight has been deduced and illustrated with polyvinyl acetate polymers. Provided the molecular weight is high enough to prevent cohesive failure, the adhesion of polyvinyl acetate to cellulose and aluminum is independent of molecular weight. The influence of humidity on adhesion of polymers to cellulose is shown. The influence of polymer composition on adhesion is illustrated with copolymers of vinyl acetate and methyl vinyl ketone and with styrene and methyl vinyl ketone. Above a mole fraction of ketone of 0.8, adhesion increases rapidly. The interdependence of tack temperature and composition on adhesion is exemplified with ethylene ‐ vinyl chloride copolymers. A temperature dependence of adhesion is cited for copolymers containing maleic acid.

Surface pressure-area measurements for films of polyvinyl acetate polymers spread on water

Except for solubility of low molecular weight fractions and anomalous spreading of the very high molecular weight fraction Gelva V 1700, the films of the polyvinyl acetate polymers studied were stable and well behaved. Extrapolation of the F × A– F plots for these films to obtain molecular weights does not appear feasible, as it would necessitate the accurate measurement of extremely small surface pressures in a region of low surface concentration, where unavoidable contamination introduces an increasing uncertainty in such measurements.

Intrinsic viscosities and molecular weights of polyvinyl acetates

AbstractA polyvinyl acetate polymer of medium viscosity was fractionated into sixteen fractions (first series) and three of the larger of these further separated into twenty subfractions (second series). The intrinsic viscosities and the osmotic pressure molecular weights were determined at 25°C. and the relation between them was found to be expressed by the equations: first series: [η] = (1.88 × 10−4) M0.69; second series: [η] = (1.76 × 10−4) M0.68. The data indicate that little, if any, increase in homogeneity is to be expected by further successive fractionations and that the equations applicable to the second fractionation series are representative of essentially homogeneous polyvinyl acetates in acetone. An equation applicable to fractionated and unfractionated vinyl acetate polymers is described that is useful in obtaining the intrinsic viscosity from a single viscosity measurement. Several unfractionated materials from different sources were also studied and the calculated ratios of the viscosity‐average to the number‐average molecular weight indicate that the degree of heterogeneity of chain‐length distribution increases with increasing average molecular weight.