A Study on the Properties of Starch/Glycerine Blend

Polyvinyl pyrrolidone/polyvinyl alcohol (PVP/PVA) and polyvinyl pyrrolidone/starch (PVP/St) blends were prepared with different compositions. The compatibility studies indicate that PVP/PVA is compatible while PVP/St is incompatible. The addition of glycerol and glutaraldehyde can improve to some extent the phase separation behavior between PVP and St. The permittivity e 0 and the dielectric loss e 00 were measured in the frequency range 0.01 Hz up to 10 MHz and temperatures from 30 up to 90 C. It is found that the blend ratio (50/50) of both investigated systems is preferable for insulation purposes in comparable with the other blends under investigation. The data of the loss electric modulus M 00 was calculated from the dielectric parameters e 0 and e 00 and analyzed into three relaxation mechanisms ascribing the cooperative motion of the main and side chains s 1 (ab), the side chain motion s 2 (b) and the segmental motion of the groups attached to the side chains s 3 (bc). The activation energy corresponds to the second relaxation process DH 2 was calculated using Arrhenius equation and found to be in the range which justifies the presumption of b-relaxation process.

Section: Introductionmentioning

confidence: 99%

Biodegradable blends based on polyvinyl pyrrolidone for insulation purposes

El-Houssiny

Ward

Mansour

et al. 2011

“…Starch by itself was plasticized and shaped into consumer items. [2][3][4][5] But plasticized starch alone swells and deforms on exposure to moisture. To compensate the inconvenience of plastics made by pure starch, starch was blended with petroleum polymers.…”

Section: Introductionmentioning

confidence: 99%

Sodium alginate and its blends with starch: Thermal and morphological properties

Siddaramaiah¹,

Swamy²,

Ramaraj

et al. 2008

A series of sodium alginate (SA) and starch blends, namely 100/0, 90/10, 80/20, 70/30, and 60/40, were processed into films by solution casting process and the obtained SA/starch blends have been characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). DSC analysis shows single glass transition temperature (T g ) up to 30 wt % starch content in the blend, indicating the compatibility and interaction between SA and starch molecules. The TGA reveals the reduction in thermal stability of SA/starch with increase in starch content. FTIR analysis demonstrated the existence of specific intermolecular interactions between carbonyl groups of SA and hydroxyl groups of starch. The morphological analysis by SEM shows the homogeneous distribution of starch in the SA matrix.

“…Starch is totally biodegradable in a wide variety of environmental conditions and permits the development of totally biodegradable products. Starch by itself was plasticized and shaped into consumer items 3–6. But plasticized starch alone swells and deforms on exposure to moisture.…”

Section: Introductionmentioning

confidence: 99%

Crosslinked poly(vinyl alcohol) and starch composite films. II. Physicomechanical, thermal properties and swelling studies

Ramaraj

2006

164

115

Poly(vinyl alcohol) (PVA) was blended with 10,20,30,40, and 50 wt % of starch with and without crosslinking by solution casting process. The solution-casted films were dried and tested for physicomechanical properties like tensile strength, tensile elongation, tensile modulus, tear and burst strengths, density, and thermal analysis by differential scanning calorimetry (DSC). These PVA/starch films were further characterized for moisture content; solubility resistance in water, 5% acetic acid, 50% ethanol, and sunflower oil; and swelling characteristics in 50% ethanol and sunflower oil. The crosslinked PVA/starch composite films show significant improvement in tensile strength, tensile modulus, tear and burst strengths, and solubility resistance over the uncrosslinked films. Between the crosslinked and uncrosslinked films, the uncrosslinked films have higher tensile elongation, moisture content, moisture absorption, and swelling over the crosslinked films.