Structure -properties relations of polypropylene/ liquid crystalline polymer blends

Sahoo, Nanda Gopal; Das, C. K.; Jeong, Hae Yong; Ha, Chang Sik

doi:10.1007/bf03218356

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…For EP/Kevlar composite (sample B), the degradation starts at 245°C and continues up to 352°C at a slowest rate and almost 32% of the sample degraded in this step. These observations are quite in agreement with the findings by Sahoo et al [17], while the onset of decomposition was delayed in liquid crystalline polymer (LCP)-PP composites compared to pure PP. However, in case of EP/Kevlar (fluorinated) and EP/Kevlar (oxyfluorinated), the initial degradation starts at a higher temperature (about 254.4°C, 269°C) than B.…”

Section: Dsc/tga Studiessupporting

confidence: 93%

Fluorinated and oxyfluorinated short Kevlar fiber‐reinforced ethylene propylene polymer

2006

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The thermomechanical behavior of fluorinated and oxyfluorinated Kevlar fiber-reinforced ethylene propylene (EP) composites has been studied. The composites have been prepared using brabender mixer and are cured using compression molding technique. FTIR study has been performed to understand the chemical reaction occurred due to modification of composites. Thermal behavior and crystallinity have been studied by DSC, TGA, DMTA, and XRD. These studies show that thermal stability, storage modulus, as well as crystallinity of the treated Kevlar fiber-reinforced EP increases in comparison to the untreated derivative because the surfacemodified Kevlar fiber results in good adhesion between the fiber surface and EP matrix. Tensile strength increases in case of treated Kevlar fiber-reinforced EP in comparison to the untreated one. SEM study supports all the above results. AFM results show that surface roughness increases because of the surface modification resulting from the incorporation of functional group-induced Kevlar fiber. POLYM. COMPOS., 27: 205-212, 2006.

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Section: Dsc/tga Studiessupporting

confidence: 93%

Fluorinated and oxyfluorinated short Kevlar fiber‐reinforced ethylene propylene polymer

2006

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“…[28,29] DSC measurements were carried out using a TA instrument 2010 (Du Pont) thermal analyzer in a temperature range of À50 to þ250 8C, at a heating rate of 10 K Á min À1 in nitrogen. The first cooling and second heating DSC thermograms were used for the analysis.…”

Section: Experimental Partmentioning

confidence: 99%

Effect of Functionalized Carbon Nanotubes on Molecular Interaction and Properties of Polyurethane Composites

Sahoo

Jung

Yoo

et al. 2006

Macro Chemistry & Physics

166

121

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Summary: Functionalized MWNTs were incorporated into PU by solution mixing to improve the mechanical and thermal properties of composites. A homogeneous dispersion of MWNTs was successfully achieved in PU matrix as evidenced by scanning electron microscopy. It may be attributed to the hydrogen bonds existing between CO groups of hard segments of PU chains and COOH groups of the MWNT‐COOH. The incorporation of the MWNTs effectively enhanced the crystallization of the PU matrix through heterogeneous nucleation, and the nucleation effect was more evident at 10 wt.‐% functionalized MWNTs as compared to other composite systems. Mechanical properties of the PU‐MWNTs composites were assessed as a function of MWNT concentration and dispersion of MWNT in PU matrix. The most significant improvement in mechanical properties was obtained, e.g., 740% increase in modulus and 180% increase in tensile strength over pure PU with 20% MWNT content. The thermal stability of composites due to thermal gravimetric measurements was significantly improved.A possible interaction of H‐bonding existed between PU chain and MWNT‐COOH.magnified imageA possible interaction of H‐bonding existed between PU chain and MWNT‐COOH.

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“…From Figure 3, it was observed that pure PBT showed a melting endotherm, T m , at about 225 C whereas for LCP-g it occurred at about 282 C [16]. The melting endotherm of blends showed values close to the T m of PBT.…”

Section: Thermal Analysismentioning

confidence: 83%

Speciality Polymer Blends of Polybutylene Terephthalate and Glass-Filled Liquid Crystalline Polymer

Sahoo

Das

Jeong

et al. 2004

Journal of Elastomers & Plastics

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The blends of polybutylene terephthalate (PBT) with glass-filled thermotropic liquid crystalline polymer (LCP-g) was prepared by a melt mixing technique. The rheological, crystalline, thermal, dynamic mechanical, and morphological characteristics of these blends were investigated. The viscosity of the blends was higher than PBT in the whole shear rate range. At low shear rate, the viscosity of blends decreased with LCP concentration. Higher percent crystallinity was observed with increasing LCP-g content in the blend with PBT. The thermal stability increased with LCP-g content in the blend with PBT. The relaxation phenomenon as observed from DMTA analysis was changing depending on the blend ratio. The variation of stiffness and storage modulus as a function of LCP-g concentration at various temperatures suggested the phase inversion occurred at 40% LCP-g present in the blend. The orientation of the LCP-g molecules probably play a major role in determining the surface morphology rather than the surface free energy difference.

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Structure -properties relations of polypropylene/ liquid crystalline polymer blends

Cited by 8 publications

References 21 publications

Fluorinated and oxyfluorinated short Kevlar fiber‐reinforced ethylene propylene polymer

Fluorinated and oxyfluorinated short Kevlar fiber‐reinforced ethylene propylene polymer

Effect of Functionalized Carbon Nanotubes on Molecular Interaction and Properties of Polyurethane Composites

Speciality Polymer Blends of Polybutylene Terephthalate and Glass-Filled Liquid Crystalline Polymer

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