[PDF] Morphology And Mechanical Behavior Of Isomeric Graft Copolymers And Interpenetrating Polymer Networks eBook

Author : L. H. Sperling
Publisher :
Page : 11 pages
File Size : 17,99 MB
Release : 1978
Category :
ISBN :

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The major accomplishments encompass four areas of research: (1) Controlled Grafting of Simultaneous Interpenetrating Polymer Networks. This research, which elucidated the relationship between polymer 1/polymer 2 compatibility and deliverately introduced graft sites, has now been accepted for publication by Polymer Science and Engineering. From an engineering point of view, the controlled morphology produced using epoxy/acrylic combinations yielded very tough, novel plastics. (2) Novel Staining Techniques for Saturated Two-Phased Polymers. Up till now, the only good staining technique for polyblends utilized an osmium tetroxide attack on polymer containg double bonds. The research under this contract showed how this method could be successfully extended to carboxyl or ester containing systems such as acrylics or methacrylics. (3) Polymer Blend and Interpenetrating Polymer Network Nomenclature. A major stumbling block in the development of multicomponent polymer systems has been an inadequate nomenclature. (4) The first experiments on decrosslinking of interpenetrating polymer networks was done under the auspices of this contract. Overall, significant progress was achieved in several areas of research. Several papers have either already appeared in print or will do so in the coming months.

Author : L.H. Sperling
Publisher : Springer Science & Business Media
Page : 269 pages
File Size : 33,47 MB
Release : 2012-12-06
Category : Science
ISBN : 1468438301

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To the surprise of practically no one, research and engineering on multi polymer materials has steadily increased through the 1960s and 1970s. More and more people are remarking that we are running out of new monomers to polymerize, and that the improved polymers of the future will depend heavily on synergistic combinations of existing materials. In the era of the mid-1960s, three distinct multipolymer combinations were recognized: polymer blends, grafts, and blocks. Although inter penetrating polymer networks, lPNs, were prepared very early in polymer history, and already named by Millar in 1960, they played a relatively low-key role in polymer research developments until the late 1960s and 1970s. I would prefer to consider the IPNs as a subdivision of the graft copolymers. Yet the unique topology of the IPNs imparts properties not easily obtainable without the presence of crosslinking. One of the objectives of this book is to point out the wealth of work done on IPNs or closely related materials. Since many papers and patents actually concerned with IPNs are not so designated, this literature is significantly larger than first imagined. It may also be that many authors will meet each other for the first time on these pages and realize that they are working on a common topology. The number of applications suggested in the patent literature is large and growing. Included are impact-resistant plastics, ion exchange resins, noise-damping materials, a type of thermoplastic elastomer, and many more.

Author : D.R. Paul
Publisher : Elsevier
Page : 454 pages
File Size : 18,4 MB
Release : 2012-12-02
Category : Technology & Engineering
ISBN : 0323149774

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Polymer Blends, Volume 2 aims to show the importance of mixed polymer systems as a major branch of macromolecular science and provides a broad background of principles and practices in this field. Starting from where the first volume left off, the book covers topics in the area of polymer blends in Chapters 11-23. Areas of coverage include interpenetrating polymer networks; interfacial agents for polymer blends; rubber modification of plastics; fracture phenomena; coextruded multilayer polymer films and sheets; polymeric plasticizers; and polyolefin blends and their applications. The book is recommended for scientists, technologists, and engineers in the academe, research, and related industry, especially those who wish to be updated with its advances as a science.

Author : Gunther Molau
Publisher : Springer Science & Business Media
Page : 326 pages
File Size : 34,90 MB
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 1468419080

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The molecules of block and graft copolymers are molecules of a higher order; they consist of homopolymer subchains which are interconnected by chemical valence bonds. This structural com plexity is manifested in the unusual behavior of block and graft copolymers both in solution and in bulk. Many types of interac tions are possible in block and graft copolymers in the solid state. Polymer subchains of one molecule can interact with other polymer subchains which may belong to the same molecule or to different molecules. Since polymer chains of chemically different composition are usually incompatible, thermodynamically unfavorable as well as thermodynamically favorable interactions exist in the solid state. In solutions of block and graft copolymers, the sit uation becomes even more complex, because interactions between the solvent molecules and the various subchains of the copolymer mole cules occur in addition to the interactions between the polymer chains. This multitude of interactions gives rise to a wide spec trum of colloidal and morphological properties which have no paral lel in less complex polymer systems such as homopolymers or random copolymers. Research on the colloidal and morphological behavior of block and graft copolymers is a relatively new field of endeavor. It started in 1954, when F. M. Merrett fractionated mixtures of grafted na tural rubber with the corresponding homopolymers and observed that colloidal sols were formed at certain points during his fractional precipitations.

Author : Labana
Publisher : Elsevier
Page : 596 pages
File Size : 48,27 MB
Release : 2012-12-02
Category : Science
ISBN : 032313937X

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Chemistry and Properties of Crosslinked Polymers provides a description of the structure property relationship, chemistry, and methods of characterization of crosslinked polymers. The book presents papers that discuss experimental techniques to study polymer network structure; deduction of information on network structure from theoretical considerations; interpenetrating polymer networks; crosslinked polymers for high temperature applications; a novel class of polyurethanes; crosslinking agents; and the influence of crosslinking agents on thermal and mechanical properties. The text will be of value to materials scientists and engineers, chemists, and researchers in the field of polymer science.