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| Titel: |
Miscibility Studies of Polyesteramides of Linseed Oil and Dehydrated Castor Oil with Poly(vinyl alcohol) |
| Auteur: |
Sharma, H. O. Alam, Manawwer Riaz, Uffana Ahmad, Sharif Ashraf, S. M. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 56 (2007) nr. 4 pagina's 437-451 |
| Jaar: |
2007-04-01 |
| Inhoud: |
Blends of two polymers have been widely investigated to enhance or modify some of their physical or mechanical characteristics for specific applications. The investigation of miscibility of a pair of polymers is a necessary step in the investigation of the properties of the blends. Poly(vinyl alcohol)(PVA) is a commercial polymer that yields tough films of high tensile strength. They are, however, water soluble, restricting their applications. Vegetable oil constitutes a major resource for several polymeric products, such As alkyds, polyurethanes, polyepoxies, and polyesteramides. Polyesteramides, synthesized from different seed oils, have been used as an anticorrosive material but they fail to form free standing films. They can, therefore, be used for blending with PVA to lower its water sensitivity as well as to obtain free-standing films of a sustainable resource based polymer. In this study, linseed oil polyesteramide (LOPEA) and dehydrated castor oil polyesteramide (DCPEA), the source oils having different unsaturation in their fatty acids chains, were blended with PVA through mixing in solution in the weight ratios LOPEA/DCPEA:PVA: 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80. In the first phase the miscibility of the two components was investigated in solution by viscosity and ultrasonic measurements and in the solid form through differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). Moisture absorption by the films of different compositions of the blends was studied. The viscosity and ultrasonic studies show that both DCPEA and LOPEA were immiscible with PVA in solution. In solid phase the DCPEA and PVA were found to be partially miscible whereas LOPEA and PVA were found to be completely immiscible. Films of the blend DCPEA:PVA:80:20 were found to be the toughest. Blends of all compositions showed lower absorption of moisture than pure PVA. In view of the toughness of its films, low moisture uptake and high content of sustainable resource based polymer, DCPEA:PVA, 80:20 blend holds potential for commercial application. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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