Modification of polyethylene by unsaturated compounds

Vijayalakshmi, N. S.; Murthy, R. A. N.

doi:10.1002/app.1992.070440809

Cited by 19 publications

(12 citation statements)

References 2 publications

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“…However, materials such as polyester, nylon, and poly(vinyl chloride), due to their polar nature, are good barriers of oxygen but poor barriers of water vapor. 39 The polarity difference caused by the incorporation of HMDI and TDI into PP matrix appeared to be adequate to cause an appreciable reduction in OTR and CO 2 TR.…”

Section: Barrier Propertiesmentioning

confidence: 97%

Chemical modification of polypropylene with diisocyanates for improved gas barrier and mechanical properties

2009

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ABSTRACT:In this investigation, modification of polypropylene (PP) with an objective to obtain packaging film with improved gas barrier properties has been studied. The chemical reaction of PP resin with hexamethylene diisocyanate and toluene diisocyanate was monitored by Fourier transform infrared spectroscopy, wherein the appearance of new peaks at 3333 cm −1 for N H stretching, 1620-1641 cm −1 for (C O) NH stretching and 1552-1578 cm −1 corresponding to N H bending in an amide moiety was observed for both the modified PP films. Films of excellent clarity and uniform thickness were obtained by the extrusion of cross-linked polypropylene. The barrier, mechanical, optical, and thermal properties of the modified PP films were studied. The results clearly indicated significant changes in gas barrier and mechanical properties. Food

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Section: Barrier Propertiesmentioning

confidence: 97%

Chemical modification of polypropylene with diisocyanates for improved gas barrier and mechanical properties

2009

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“…However, the use of pure LDPE is restricted because of some of its inherent properties such as, a high oxygen and carbon dioxide transmission rate (OTR and CO 2 TR), poor grease resistance, and limited adhesion to other substances. Hence, it is mostly used as laminated films in combination with other films that possess superior barrier properties, which invariably require the use of adhesives or as co‐extrusion for better packaging applications 2. The intrinsic properties of polyethylene mainly arise from its totally nonpolar nature.…”

Section: Introductionmentioning

confidence: 99%

Blending of low‐density polyethylene with vanillin for improved barrier and aroma‐releasing properties in food packaging

Jagadish

Raj

Asha

2009

J of Applied Polymer Sci

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Modification of low-density polyethylene (LDPE) with vanillin to obtain flavored packaging film with improved gas barrier and flavor-releasing properties has been studied. The modification of LDPE with vanillin was monitored by Fourier transform infrared spectroscopy, wherein the appearance of new peaks at 1704.7, 1673.6, and 1597.2 cm À1 indicates the incorporation of vanillin into LDPE matrix. Films of uniform thickness were obtained by the extrusion of modified LDPE. Modified LDPE was found to have significantly higher gas barrier properties and grease resistance. Sensory quality of food products viz, doodhpeda (milk-based solid soft sweet), biscuit, and skimmed milk powder packed in LDPE-vanillin film showed that the doodhpeda sample had clearly perceptible vanilla aroma, whereas biscuit had marginal aroma and skimmed milk powder did not have noticeable aroma. When viewed in the light of imparting desirable vanilla aroma, results of the study indicated that LDPE-vanillin film has better prospects as a packaging material for solid sweets with considerable fat content when stored under ambient conditions. The release of vanilla aroma was further confirmed by gas chromatography-mass spectrometery analysis.

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“…As mentioned before, polymer-polymer miscibility is generally considered to be a result of the specific interactions between polymer segments, which include donor-acceptor, dipole-dipole, hydrogen bonding, ion-ion, acid-base and ion-dipole interactions. 66 In the studied blends, with hydrophobic/hydrophilic and electron-donor characteristics, miscibility is due especially to hydrogen bonding. In addition, NMP is known as a solvent with electron-donor properties, so that the morphological aspects of blends are determined by hydrogen bonding present in the casting solution system, along with other kinds of apolar interactions; consequently, polymer dissolution is ensured by the interfacial free energy of the polymers versus the solvent, by taking into account the polar as well as the apolar surface tension parameters.…”

Section: Topographic Reorganization Of Psf Films Induced By the Presementioning

confidence: 97%

Rheological and morphological characteristics of multicomponent polysulfone/poly(vinyl alcohol) systems

Filimon¹,

Avram²,

Stoica³

2014

Polymer International

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Modification of polyethylene by unsaturated compounds

Abstract: SYNOPSISPolyethylene was reacted with maleic anhydride and N-phenylmaleimide in solution. The effect of modification on its physico-chemical properties, such as mechanical, oxygen gas transmission, water vapor transmission, and grease resistance properties, was studied.

Cited by 19 publications

References 2 publications

Chemical modification of polypropylene with diisocyanates for improved gas barrier and mechanical properties

Chemical modification of polypropylene with diisocyanates for improved gas barrier and mechanical properties

Blending of low‐density polyethylene with vanillin for improved barrier and aroma‐releasing properties in food packaging

Rheological and morphological characteristics of multicomponent polysulfone/poly(vinyl alcohol) systems

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