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RISS 인기검색어
- 검색키워드
- 저자 : Sati.N.Bhattacharya (검색결과 4 건)
- 무료
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Effect of mixing on shear rheology of EVA nanocomposites
Rahul K Gupta,Sati N. Bhattacharya 한국유변학회 2010 Korea-Australia rheology journal Vol.22 No.3
EVAs with VA contents of 9%, 18%, 28% and 40% by weight and commercially modified montmorillonite clay were melt compounded in a twin-screw extruder. Nanocomposites of different clay loadings (2 to 7.5wt%) were produced. Two mixing techniques were used to produce these EVA nanocomposites. WAXS measurements have revealed that EVA chains had intercalated into the silicate layers and expanded the interlayer distance. TEM showed that the morphologies of the nanocomposites were of mixed intercalated /exfoliated. Shear rheology was employed to investigate elastic issues related to different EVA nanocomposites. Elasticity of the nanocomposites was compared using first normal stress difference-shear stress plots. The exfoliated morphology shown by EVA28 nanocomposites demonstrated that normal stress difference decreases as shear stress increases.
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Rahul k.Gupta,Amita Bhatia,Sati.N.Bhattacharya,최형진 한국유변학회 2007 Korea-Australia rheology journal Vol.19 No.3
Biodegradable polymeric blends are expected to be widely used by industry due to their environmental friendliness and comparable mechanical and thermal properties. Poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) are such biodegradable polymers which aim to replace commodity polymers in future applications. Since cost and brittleness of PLA is quite high, it is not economically feasible to use it alone for day to day use as a packaging material without blending. In this study, blends of PLA and PBS with various compositions were prepared by using a laboratory-scale twin-screw extruder at 180oC. Morphological, thermal, rheological and mechanical properties were investigated on the samples obtained by compression molding to explore suitability of these compositions for packaging applications. Morphology of the blends was investigated by scanning electron microscopy (SEM). Morphology showed a clear phase difference trend depending on blend composition. Modulated differential scanning calorimetry (MDSC) thermograms of the blends indicated that the glass transition temperature (Tg) of PLA did not change much with the addition of PBS, but analysis showed that for PLA/PBS blend of up to 80/20 composition there is partial miscibility between the two polymers. The tensile strength and modulus were measured by the Instron Universal Testing Machine. Tensile strength, modulus and percentage (%) elongation at break of the blends decreased with PBS content. However, tensile strength and modulus values of PLA/PBS blend for up to 80/20 composition nearly follow the mixing rule. Rheological results also show miscibility between the two polymers for PBS composition less than 20% by weight. PBS reduced the brittleness of PLA, thus making it a contender to replace plastics for packaging applications. This work found a partial miscibility between PBS and PLA by investigating thermal, mechanical and morphological properties.
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Ko, Seung Woo,Gupta, Rahul K.,Bhattacharya, Sati N.,Choi, Hyoung Jin WILEY-VCH Verlag 2010 Macromolecular Materials & Engineering Vol.295 No.4
<P>PLA/PBAT blends and PLA/PBAT/MWNT nanocomposite systems were prepared via a melt mixing process to examine their thermal and rheological properties. To compare the polymer blend/MWNT nanocomposite with a pure polymer/MWNT nanocomposite, PLA/MWNT, PBAT/MWNT, and PLA/PBAT/MWNT nanocomposite systems were prepared. TEM and SEM were used to observe that one phase has better affinity with the MWNT, while the MWNT was found to increase both the thermal properties of the PLA/PBAT blends and rheological properties of the PLA/PBAT/MWNT nanocomposite with distinct shear-thinning behavior due to the addition of the MWNT. An increase in the storage (G′) and loss (G″) moduli for the PLA/PBT/MWNT nanocomposite was also observed.</P><P> <img src='wiley_img_2010/14387492-2010-295-4-MAME200900390-gra001.gif' alt='wiley_img_2010/14387492-2010-295-4-MAME200900390-gra001'> </P> <B>Graphic Abstract</B> <P>MWNTs dispersed in polymers contribute significantly to the physical and rheological properties of polymer blend/MWNT nanocomposite systems. PLA/PBAT blends and PLA/PBAT/MWNT nanocomposite systems are prepared to examine their thermal and rheological properties. The MWNT is shown to improve the thermal properties of the nanocomposites significantly. Both shear and complex viscosities show a unique shear thinning behavior due to selectively localized MWNT dispersion states. <img src='wiley_img_2010/14387492-2010-295-4-MAME200900390-content.gif' alt='wiley_img_2010/14387492-2010-295-4-MAME200900390-content'> </P>
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Bhatia, Amita,Gupta, Rahul K.,Bhattacharya, Sati. N.,Choi, H.J. The Korean Society of Rheology 2007 Korea-Australia rheology journal Vol.19 No.3
Biodegradable polymeric blends are expected to be widely used by industry due to their environmental friendliness and comparable mechanical and thermal properties. Poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) are such biodegradable polymers which aim to replace commodity polymers in future applications. Since cost and brittleness of PLA is quite high, it is not economically feasible to use it alone for day to day use as a packaging material without blending. In this study, blends of PLA and PBS with various compositions were prepared by using a laboratory-scale twin-screw extruder at $180^{\circ}C$. Morphological, thermal, rheological and mechanical properties were investigated on the samples obtained by compression molding to explore suitability of these compositions for packaging applications. Morphology of the blends was investigated by scanning electron microscopy (SEM). Morphology showed a clear phase difference trend depending on blend composition. Modulated differential scanning calorimetry (MDSC) thermograms of the blends indicated that the glass transition temperature ($T_g$) of PLA did not change much with the addition of PBS, but analysis showed that for PLA/PBS blend of up to 80/20 composition there is partial miscibility between the two polymers. The tensile strength and modulus were measured by the Instron Universal Testing Machine. Tensile strength, modulus and percentage (%) elongation at break of the blends decreased with PBS content. However, tensile strength and modulus values of PLA/PBS blend for up to 80/20 composition nearly follow the mixing rule. Rheological results also show miscibility between the two polymers for PBS composition less than 20% by weight. PBS reduced the brittleness of PLA, thus making it a contender to replace plastics for packaging applications. This work found a partial miscibility between PBS and PLA by investigating thermal, mechanical and morphological properties.
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