Poly (Vinyl Alcohol)/Poly (Vinyl Acetate)

2010
Nataļja Geisari, Mārtiņš Kalniņš, Velta Tupureina, Anda Dzene

Poly (vinyl alcohol) (PVA) and poly (vinyl acetate) (PVAc) blend films were prepared by mixing of water systems: PVA solution and PVAc emulsion with subsequent drying at room temperature. Differential scanning calorimetry (DSC) and SEM investigation shows that components in mixtures form discrete phases. Blends are microheterogeneous. In blends with high PVA content where the dispersion phase is PVA, inclusions of PVAc phase with predominant dimensions 2 - 4 m are detectable. For systems with low PVA content PVA inclusions as discrete objects are less visible. Tensile stress  - strain relations of blend films were determined. Some common  and  values were fixed(maximum stressMAXand respective strain value MAX, yield stressY and correspondingY, and characteristics at fracture Band B), initial modulus of elasticity E = lim(d/d)|→0 . Films with broad range of tensile strength-deformation characteristics: E = 0,3 – 2,2 GPa, MAX = 9 – 106 MPa, Y =: 8 – 73 MPa, B = 11 - 42 MPa, B = 0,32 – 2,07 can be obtained by variation of ratio of component content in mixture

Keywords
Poly (vinyl alcohol), poly (vinyl acetate), blends, films, composition, mechanical properties

Jeļinska, N., Kalniņš, M., Tupureina, V., Dzene, A. Poly (Vinyl Alcohol)/Poly (Vinyl Acetate) . Materials Sciences and Applied Chemistry. Vol.21, 2010, pp.55-61. ISSN 1407-7353.

Publication language
English (en)