2 edition of Chemical modification of some synthetic elastomers found in the catalog.
Chemical modification of some synthetic elastomers
J. R. Hawkins
Written in English
Thesis(Ph.D.) - Loughborough University ofTechnology 1975.
|Statement||by J.R. Hawkins.|
An Elastomer is a polymer with viscoelasticity (i.e., both viscosity and elasticity) and has very weak intermolecular forces, generally low Young's modulus and high failure strain compared with other materials. The term, a portmanteau of elastic polymer, is often used interchangeably with rubber, although the latter is preferred when referring to vulcanisates. The decomposition of azobisformamide (ABFA) blowing agent and its expansion in a soft grade of thermoplastic natural rubber composed of a 70/30 natural rubber (NR)/polypropylene (PP) was monitored using a Haake plasticorder. The aim of the study was to evaluate the effect of different concentrations of the blowing agent and to investigate its eventual interactions with a sulfur-based curing.
Setting times of 10 minutes or more are not uncommon, particularly for light-bodied materials. The polysulphide elastomers have very good tear resistance. They can, typically, withstand about % tensile strain before tearing. Some of this strain is non-recoverable, since the elastic properties of these materials are far from ideal. By chemical modification of natural rubber, it is possible to modify its basic properties (for instance, improvement of gas permeability, resistance to oils or fire resistance) or to prepare new polymeric materials for specific applications (for instance, photocrosslinkable rubbers and rubbers support of .
The integration of genetically programmed cells into materials and devices will enable the power of biology to be harnessed for a wide range of scientific research and technological applications. Here, we use stretchable, robust, and biocompatible hydrogel–elastomer hybrids to host genetically programed bacteria, thus creating a set of stretchable and wearable living materials and devices. An alternative for solving the environmental pollution problems generated by conventional plastics, it is the chemical modifications graft-type of the starch with synthetic polymers of post-consumer and in situ polymerizations on the starch granules. The starch modified by this methodology allows to counteract the disadvantages of both polymers such as the little or no biodegradability of the.
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Book Description "Provides the latest authoritative research on the developments, technology, and applications of rubbery materials. Presents structures, manufacturing techniques, and processing details for natural and synthetic rubbers, rubber-blends, rubber composites, and thermoplastic elastomers.
80% revised and rewritten material covers major advances since. "Provides the latest authoritative research on the developments, technology, and applications of rubbery materials. Presents structures, manufacturing techniques, and processing details for natural and synthetic rubbers, rubber-blends, rubber composites, and thermoplastic elastomers.
80% revised and rewritten material covers major advances since publication of the previous edition."5/5(1). ISBN: OCLC Number: Description: xii, pages: illustrations ; 26 cm.
Contents: 1. Guayule rubber / D. McIntyre [and others] Hevea natural rubber / A.H. Eng and E.L. Ong Modified natural rubber / Crispin S.L. Baker Chemical modification of synthetic elastomers / Donald N. Schulz and Abhimanyu O. Patil Liquid rubber / Douglas C.
Edwards. Chemical modifications of some synthetic elastomers Author: Hawkins, John R. ISNI: The aim of this investigation was to prepare a thermoplastic elastomer via the chemical modification of an existing commercially produced polymer. Two separate Chemical modification of some synthetic elastomers book modification studies were carried : John R.
Hawkins. Laurence McKeen, in The Effect of Sterilization on Plastics and Elastomers (Third Edition), Olefinic Thermoplastic Elastomers (TPO) Polyolefin thermoplastic elastomer (TPO) materials are defined as compounds (mixtures) of various polyolefin polymers, semicrystalline thermoplastics, and amorphous TPOs are composed of polypropylene (PP) and a copolymer of ethylene.
Chemical modifications of polydiene elastomers: a survey and some recent results. Journal of Applied Polymer Science, 78, – with permission from the publisher.) Effective degradation of NR in latex was reported using radical initiators potassium persulphate (K 2 S 2 O 8) and propanal (Phetphaisit and Phinyocheep, ).
Abstract. In this chapter, the linear viscoelastic properties of rubber and its dependence on various parameters are described, including crosslink density, chemical structure, and molecular weight, with experimental data principally coming from measurements on a series of well-characterized and fully cured bisphenol-A-based epoxy resins as well as some polybutadienes and fluorinated elastomers.
This chapter shows some of the instances of the uses of elastomer blends. Blends provide an acceptable technological process for accessing properties not available in a single elastomer.
Intermolecular changes in blends are not limited by such systemic or synthetic limitations. Blends of elastomers can attain a wide variation in properties. Resins are polymeric compound which are available in nature and are also manufactured by synthetic routes. Some resins are also manufactured by partial modification of natural precursor polymer by chemical.
The classic variety is epoxy resin, manufactured through polymerization, used as a thermoset polymer for adhesives and composites. "Provides the latest authoritative research on the developments, technology, and applications of rubbery materials.
Presents structures, manufacturing techniques, and processing details for natural and synthetic rubbers, rubber-blends, rubber composites, and thermoplastic elastomers.
80% revised and rewritten material covers major advances since pu. Surface preparation or treatment for adhesion is defined as one or a series of operations including cleaning, removal of loose material, and physical and/or chemical modification of a surface to which an adhesive is applied for the purpose of bonding.
In plastics bonding, surface preparation is aimed at increasing the surface polarity, improving surface wettability, and creating sites for. Polymer engineering is generally an engineering field that designs, analyses, and modifies polymer materials.
Polymer engineering covers aspects of the petrochemical industry, polymerization, structure and characterization of polymers, properties of polymers, compounding and processing of polymers and description of major polymers, structure property relations and applications.
Figure 1. Mechanism of NR cyclization . Recently, cyclization on deproteinized natural rubber (DPNR) latex was reported by Riyajan et al. [6, 10, 11].Cyclization on DPNR was reported to be more effective as the presence of the protein can retard and disturb the chemical modification .Cyclized NR in general was reported to be tough, hard and brittle but some elastic behaviour is still.
Elastomers Overview Chemical Economics Handbook. The following pie charts show world consumption of natural rubber and synthetic elastomers.
low-voltage wire and cable insulation, and polymer modification. Because of the fast cycle time, recyclability, and overall cost-effectiveness, TPEs have become the fastest-growing of all major.
This simple process of chemical modification has led to % conversions of chloromethyl groups in some cases. that of the reaction by milling between synthetic olefinic elastomers and maleic.
In terms of R&D, his interest is mainly in elastomers, both natural and synthetic, covering various aspects of rubber science, technology and engineering.
To date he had several publications in refereed journals and conference proceedings and had authored a book and three book chapters related to rubbers and natural rubber. The book then focuses on the production and classification of different synthetic rubbers, such as styrene-butadiene, isoprene, butadiene, ethylene-propylene, and chloroprene.
It also discusses the production, properties, and applications of elastomers, vulcanization chemicals, fillers, stabilizers, plasticizers, blowing agents, and textile. The common elastomers have characteristic low modulus, though with poor abrasion and chemical resistance.
Theoretical concepts have been established for their thermodynamics and kinetics and this knowledge has been applied to extending their properties by design of chemical and molecular structures, or by modification by control of crosslinking.
Uncured adhesive elastomeric compositions are provided comprising an unsaturated polymeric dicarboxylic acid or derivative adduct and an elastomer. These compositions are capable of adhesion to a broad, general range of materials and are useful for bonding elastomers to other elastomers, to plastic materials, to metal, fabrics, fibers, paper and miscellaneous substrates.
Elastomer, any rubbery material composed of long chainlike molecules, or polymers, that are capable of recovering their original shape after being stretched to great extents—hence the name elastomer, from “elastic polymer.”Under normal conditions the long molecules making up an elastomeric material are irregularly coiled.
With the application of force, however, the molecules straighten. Tribological properties of elastomers can be considered from the following points of view: (1) composition and molecular structure of polymer matrix; (2) type of filler, filler loading, and morphology of the system; and (3) modification of the material, which can take place spontaneously during processing.
4 ARLANXEO Performance Elastomers, Keltan R&D, P.O. BoxBC Geleen, -chemical modification of polyolefins. From toshe worked at the development of WSE as a postdoc researcher at the University of Groningen. Inshe joined Allnex Netherlands B.V.
(formerly Nuplex Resins B. V.) as a Senior Materials Specialist at.Some resins are also manufactured by partial modification of natural precursor polymer by chemical. The classic variety is epoxy resin, manufactured through polymerization, used as a thermoset polymer for adhesives and composites.