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2 edition of study of phosphorus-containing antioxidants in polyolefins. found in the catalog.

study of phosphorus-containing antioxidants in polyolefins.

Parmode Sharma

study of phosphorus-containing antioxidants in polyolefins.

by Parmode Sharma

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  • 35 Currently reading

Published by Aston University. Department of Chemical Engineering in Birmingham .
Written in English


Edition Notes

Thesis (Phd) - Aston University, 1988.

ID Numbers
Open LibraryOL13907315M

Abstract: The PP/PE composite fibers were prepared by melt extrusion, using polypropylene (PP) and polyethylene (PE) as raw materials and ethylene-octene block copolymers (OBC), titanium dioxide, antioxidants as additives. 3D stereoscopic embossed polyolefin nonwovens with "cross" pits and "O" type relief structure applied to topsheet of diapers were produced through air bonding process and 3D.   Phosphorus-containing antioxidants that can be used in the practice of this invention include, but are not limited to, IRGAFOS™ , IRGAFOS™ and IRGASTAB™ , all available from BASF. In one embodiment, the phosphorus-containing second antioxidant is present in an amount from to wt % based on the weight of the : Jeffrey M. Cogen, Manish Talreja, Raghunath Roy, Thomas H. Peterson, Jessica D. Drazba, Neil W. Dunc.

Antioxidants for polyolefins (polyethylene, polypropylene) are frequently alkylated phenols. They prevent radical induced formation of peroxides, which can eventually lead to polymer chain scission reactions. When these polymers are used outside in sunlight, the . The authors conducted a broad study of the synthesis and application of the different polymer lubricant additives, among which the sulfur- and phosphorus-containing polymer multifunctional additives are especially important.

6. Antioxidants for polyolefins (polyethylene, polypropylene..) are frequently alkylated phenols. They prevernt radical induced formation of peroxides, which can eventually lead to . Antioxidants are compounds that inhibit oxidation. Oxidation is a chemical reaction that can produce free radicals, thereby leading to chain reactions that may damage the cells of organisms. Antioxidants such as thiols or ascorbic acid (vitamin C) terminate these chain reactions. To balance the oxidative stress, plants and animals maintain complex systems of overlapping antioxidants, such as.


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Study of phosphorus-containing antioxidants in polyolefins by Parmode Sharma Download PDF EPUB FB2

A study of phosphorus-containing antioxidants in polyolefins Author: Sharma, Parmode Awarding Body: University of Aston in Birmingham Current Institution: Aston University Date of Award: Availability of Full Text. phosphorus-containing antioxidants; polyolefins; Cite this. Standard; A study of phosphorus-containing antioxidants in polyolefins.

Sharma, P. (Author). Student thesis: Doctoral Thesis › Doctor of Philosophy. Links. Link to thesis in EThOS. Powered by Pure, Scopus & Elsevier Fingerprint Engine. Sorry, our data provider has not provided any external links therefor we are unable to provide a : Parmode Sharma.

INTRODUCTION. Polyolefins have received significant attention recently because of their combination of flexibility, toughness, excellent barrier properties, easy manufacturing, and good chemical resistance; this has made them excellent materials for various packaging applications, especially in food packaging.

1, 2 However, the polyolefins do not easily degrade in the natural by: Antioxidants commonly used in polyolefins were studied in commercial food packages made of low- and high-density polyethylene (LDPE and HDPE), polypropylene (PP), polyvinylchloride (PVC), and polyethylene terephtalate (PET) and in a LDPE film extruded at the by: Phosphites, and in particular organophosphorus compounds, are secondary antioxidants that decompose peroxides and hydroperoxides into stable, nonradical products, according to Scheme They are extremely effective stabilizers during processing and are normally used in combination with a primary antioxidant.

Trivalent phosphorus compounds are excellent hydroperoxide decomposers. Research concerning new targeting delivery systems for pharmacologically active molecules and genetic material is of great importance. The aim of the present study was to investigate the potential of fourth generation (P4) cationic phosphorus-containing dendrimers to bind fluorescent probe 8-anilinonaphthalenesulfonate (ANS), anti-neoplastic drug cisplatin, anti-HIV siRNA siP24 and its Cited by: This study assesses the degradability of three linear polyolefin samples containing low or zero levels of antioxidant additives and a polyolefin blend containing a pro-oxidant additive, after one year of natural by:   In Australia, a total of million tonnes of polyolefins were consumed inwhich is 53% of the total plastics consumption in Australia.

Approximately 47% of polyolefins products have duration of life shorter than one month, leading to a vast waste stream by: primary antioxidants for polyolefins are sterically hindered phenols. Secondary antioxidants react with hydroperoxides to yield non-radical products and are therefore frequently called hydroperoxide decomposers, see Figure 2.

Secondary antioxidants are particularly useful in synergistic combinations with primary antioxidants. A combination. In this study, we show that two amines, stearyl amine and [(3-(aminoundecanoyl) amino) propane] silsesquioxane (amino-POSS) in combination with ferric stearate (FeSt3) tremendously accelerate the thermal oxidation of polyolefins compared with reference samples.

Both amines and FeSt3 are to a large extent based on renewable by: 5. This book chapter presents a detailed literature review on how lignin fits into the growing market for antioxidants especially fpr polyolefins, and discusses previous studies on lignin as a Cited by: 1. Engineers and scientists creating and using polyolefins compounds will find in this book a wealth of detail and practical guidance.

This unique resource will enable them to make practical. Polyolefin based geosynthetics are usually stabilized by two types of “packages” of antioxidants (AO), designated here as P1 and P2. P1 consists of phenols and phosphites, P2 of hindered amine stabilizers (HAS) in addition to a marginal stabilization P1 of the resin for the manufacturing process.

Free Online Library: A study on antioxidant depletion and degradation in polyolefin-based geosynthetics: sacrificial versus regenerative stabilization.(Report) by "Polymer Engineering and Science"; Engineering and manufacturing Science and technology, general Geomembranes Geosynthetics Analysis Chemical properties Polyethylene Polyolefins.

Application: In the film industry, a selected set of circumstances and certain types of stabilizers can lead to discoloration due to inadequate stabilizer concentrations, harsh processing conditions, improper selection of white pigments, prolonged storage in a environment containing oxides of nitrogen (pollution), and even lengthy exposure to fluorescent lighting.

A polyolefin is a type of polymer produced from a simple olefin (also called an alkene with the general formula C n H 2n) as a example, polyethylene is the polyolefin produced by polymerizing the olefin ethylene.

Polypropylene is another common polyolefin which is made from the olefin propylene. Interlaboratory test on polymers: Determination of antioxidants in polyolefins Article in Polymer Testing 24(4) June with Reads How we measure 'reads'.

PREVIOUS BOOK; NEXT BOOK; VIEW ALL BOOKS ALL BOOKS; Fire and Polymers Materials and Solutions for Hazard Prevention. Phosphorus-Containing Fire Retardants in Aliphatic Nylons. Sergei V. Levchik; A Solid-State 13 C NMR Study. Caroline M. Dick. Sahar Al-Malaika is a Professor of Polymer Science at Aston University, specialising in antioxidant chemistry, polymer modification, oxidation/ageing, stabilisation and lifetime performance (first and subsequent lives).

Most of her professional career has been spent at Aston University where she leads the Polymer Processing and Performance Research Unit. Cicchetti O. () Mechanisms of oxidative photodegradation and of UV stabilization of polyolefins.

In: Fortschritte der Hochpolymeren-Forschung. Advances in Polymer Science, vol 7/ by: This is a desirable characteristic of the antioxidants but if the pipe is conveying flowing water, some of the antioxidants at the surfaces will be washed away without ever reacting [36 – 49].

The antioxidants in the HDPE material are depleted by both of these mechanisms¸ until there is insufficient AO left to prevent oxidation of the pipe. In addition, during the last four weeks, calcium, magnesium, and ether-alcohol soluble phosphorus (lecithin) balances were included to make the study of the phosphorus metabolism more complete.

At the end of the period the rabbits were chloroformed, Author: Frank Cummings Cook.