By George Odian (auth.), Joginder Lal, James E. Mark (eds.)
The current e-book is a sequel to "Elastomers and Rubber Elasticity," edited through J.E. Mark and J. Lal and released by means of the yankee Chemical Society in 1982. it's also according to papers offered at an ACS Symposium, subsidized by way of the department of Polymer Chemistry, Inc., for that reason one held in Chicago in September of 1985. The keynote speaker used to be to were seasoned fessor Paul J. Flory, and his premature dying simply sooner than the symposium was once an enormous loss to all of polymer technology, specifically to these in terested in elastomeric fabrics. it truly is to his reminiscence that this booklet is devoted. there was loads of growth in getting ready and learning elas tomers because the previous symposium, which was once in 1981. in relation to the synthesis and curing of elastomers, a lot of the historical past essential to an appreciation of those advances is given within the first, introductory chapter.
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Table 3 shows how the position of these peaks in the 13 C NMR spectra change with added DIPIP. There is a general movement downfield of the averaged shifts of the a peak and upfield of the y peak as the concentration of DIPIP increases showing delocalization of the charge away from the end carbon to a more balanced distribution between the a and y positions. The proportion of the cis and trans forms also changes to give largely the trans form. This butadiene case is unusual in that more often it is the cis form of the active chain end whose proportion is increased when polar co-ordinating agents are present.
Bywater, Y. E. Blaek, J. Polyrn. Sei. Polym. Chern. , ~, 669 (1984). S. J. Worsfo1d, J. Organornetal. , 159, 229 (1978). A. Garton and S. Bywater, Maerornoleeu1es, 8, 694 (1975). W. Langer, Polyrn. , Div. of Polymer Chernistry, Am. Chem. , 7(1), 132 (1966). V. COllet-Marti, S. Dumas, J. Sledz, and F. l, 251 (1982). S. H. J. Worsfold, J. Polym. Sei. Polym. ehem. , ~, 1997 (1985). 49 POLYURETHANE ELASTOMERS WITH MONODISPERSE SEGMENTS AND THEIR MODEL PRECURSORS: SYNTHESIS AND PROPERTIES Claus D. Box 6980, D-7500 Karlsruhe 1, FRG ABSTRACT Uniform model compounds for the soft and hard segment of polyurethane (PU) elastomers and the corresponding tailormade elastomers with monodisperse segment length distribution were synthesized and characterized with the objective of getting a better understanding of the structure and morphology as weIl as the structure-property relationships of multiphase segmented PU elastomers from the study of such clearly defined model systems.
The morphology can be portrayed in simplified terms by assuming only two phases 1 ,2: segregated polyurethane segments form domains in a more or less continuous soft segment phase, and these socalled hard domains act as multifunctional, thermoreversible crosslinks, and as fillers. The elastic properties of these materials are based on the differences in the glass transition temperature (T g ) and melting temperature (Tm) of the two phasesi the working temperature range is limited towards low temperatures by the soft phase T , and - for crystallizable hard segments - the upper temperafure limit is given by the hard domain Tm· fAB~n It is quite obvious that this classofthermoplastic elastomers is not only interesting from processing considerations, but also because of the potential possibilities to adjust the material properties to different demands simply by varying the primary structure and average molecular weight of the segments, both of them influencing the superstructure of the system.