01493nas a2200157 4500008004100000022001400041245004900055210004300104260008900147300000800236520093600244100002401180700002501204700002401229856008201253 2008 eng d a1618-722900aPoly(4-methyl-1-pentene)/MWNT nanocomposites0 aPoly4methyl1penteneMWNT nanocomposites a1, QUAI LEZAY-MARNESIA, F067000 STRASBOURG, FRANCEbEUROPEAN POLYMER FEDERATIONcJUL a0793 a

Nanocomposites of poly(4-methyl-1-pentene) (PMP) with various weight fractions of multiwall carbon nanotubes (MWNT's) were prepared by melt compounding. The nanocomposites are characterized for structure using scanning electron microscopy. The viscoelastic behavior of the nanocomposites is investigated in solid as well as melt state. The study reveals a significant increase in storage modulus especially in the rubbery regime of the polymer matrix and reduced tan delta. Rheological properties in melt show that the complex viscosity and shear storage modulus are increased as a result of incorporation of MWNT. A systematic decrease in the cross over frequency is noted which is attributed to the increased relaxation time. In dielectric analysis, composition dependent enhanced permittivity and conductivity are observed. The thermal stability of the polymer is found to be significantly improved in presence of MWNT's.

1 aPatil, Prashant, A.1 aWanjale, Santosh, D.1 aJog, Jyoti, Prakash uhttp://library.ncl.res.in/content/poly4-methyl-1-pentenemwnt-nanocomposites-001616nas a2200205 4500008004100000022001400041245007100055210006900126260010000195300001200295490000600307520087300313653002701186653002001213653001801233653001301251100002101264700002401285856010101309 2008 eng d a1788-618X00aPreparation and characterization of electrospun fibers of nylon 110 aPreparation and characterization of electrospun fibers of nylon  aDEPT POLYMER ENG, MUEGYETEM RKP 3, BUDAPEST, H-1111, HUNGARYbBUDAPEST UNIV TECHNOL & ECONcAUG a540-5450 v23 a

Nylon 11 nanofibers mats were successfully prepared by electrospinning process from formic acid solution. The scanning electron microscopy (SEM) images showed that nanofibers with uniform diameter were produced when the polymer concentration was 10% w/v, whereas ribbons were formed at a higher concentration. The crystalline structure of the nanofibers mats was investigated using X-ray diffraction (XRD) and it was found that the nanofibers mats crystallized in gamma form. The melt crystallized as well as solution casted films however exhibited a form. The thermal properties of these samples were studied using differential scanning calorimetry (DSC) and it was observed that electrospun fibers showed higher crystallinity than the melt-crystallized samples. However, the crystallinity of electrospun fibers was lower than the solution-crystallized sample.

10abiocompatible polymers10aelectrospinning10aNanomaterials10aNylon 111 aDhanalakshmi, M.1 aJog, Jyoti, Prakash uhttp://library.ncl.res.in/content/preparation-and-characterization-electrospun-fibers-nylon-11-002130nas a2200229 4500008004100000022001400041245021700055210006900272260009900341300001400440490000800454520111600462653002701578653002501605653002601630100002101656700002501677700002401702700002001726700002401746856013001770 2010 eng d a0960-852400aProduction and characterization of a biodegradable poly (hydroxybutyrate-co-hydroxyvalerate) (PHB-co-PHV) copolymer by moderately haloalkalitolerant Halomonas campisalis MCM B-1027 isolated from Lonar Lake, India0 aProduction and characterization of a biodegradable poly hydroxyb aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcDEC a9765-97710 v1013 a

Several microorganisms produce polyhydroxyalkanoates (PHA). They are accumulated intracellularly as energy storage compounds. The PHAs are of interest because of their potential in biomedical applications. Halophilic bacteria and archaea are known to produce polyhydroxybutyrate (PHB). This paper describes production of a biodegradable copolymer, PHB-co-PHV by a moderately haloalkalitolerant Halomonas campisalis, isolated from Lonar Lake, India. The production of PHA was in the range of 45-81% on dry cell weight basis when the organism was grown in a production medium containing 1% (w/v) maltose and 0.1% (w/v) yeast extract, at pH ranging from 6 to 9 with an inoculum density of 10(5)-10(7) cells/ml of medium, for incubation period of 15-30 h and at 37 degrees C. The polymer produced by the organism is a hydroxyester with molecular weight of 1.3014 x 10(6). Its melting temperature was 171 degrees C. The (1)H NMR analysis revealed that the polymer was a copolymer of PHB-co-PHV. This could be achieved by providing simple carbon source viz. maltose. (C) 2010 Elsevier Ltd. All rights reserved.

10aBiodegradable plastics10aHalomonas campisalis10aPolyhydroxyalkanoates1 aKulkarni, S., O.1 aKanekar, Pradnya, P.1 aNilegaonkar, S., S.1 aSarnaik, S., S.1 aJog, Jyoti, Prakash uhttp://library.ncl.res.in/content/production-and-characterization-biodegradable-poly-hydroxybutyrate-co-hydroxyvalerate-phb-0