By George Odian (auth.), Joginder Lal, James E. Mark (eds.)
The current e-book is a sequel to "Elastomers and Rubber Elasticity," edited by way of J.E. Mark and J. Lal and released by means of the yankee Chemical Society in 1982. it's also in response to papers awarded at an ACS Symposium, backed by means of the department of Polymer Chemistry, Inc., for this reason one held in Chicago in September of 1985. The keynote speaker was once to were professional fessor Paul J. Flory, and his premature loss of life simply sooner than the symposium used to be a massive loss to all of polymer technology, specifically to these in terested in elastomeric fabrics. it's to his reminiscence that this publication 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 heritage essential to an appreciation of those advances is given within the first, introductory chapter.
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Extra info for Advances in Elastomers and Rubber Elasticity
R. and kinetic studies. INTRODUCTION The polymerization of the dienes butadiene and isoprene by anionic initiators can lead to a wide range of polymer structures according to the conditions under which the polymerization is performed. Various proportions of cis 1,4 structures, trans 1,4 structures and vinyl structures are found in the polymers, Table 1 gives selected values to illustrate this. These structures must be the products of the state of the active chain end at the moment of reaction. The active chain end can be thought of as a substituted allylic anion and can have two forms, the cis and trans forms.
15. Variation of Tg and tan delta with vinyl content of vinyl BR's. ---. 12 ~. 10 20 40 60 80 'lII VINYL CONTENT Fig. 16. Dependence of tan delta on vinyl content of vinyl BR's at temperatures where T-Tg = 100°. T is the test temperature. 31 The effect of increasing vinyl content on tan 5 at essentially equivalent molecular weight is, however, quite surprising and unique, as shown in Figure 15. The glass transition temperature, Tg, of the rubbers increases nearly linearly with increasing vinyl content.
INTRODUCTION Polyurethane (PU) elastomers are multiblock-copolymers with an alternating sequence of so-called soft and hard segments. The distinct differences in the chemical structure of the segments A (polyether or polyester) and B (polyurethane) contribute to segmental incompatibility, which results in forming a multiphase polymer system upon cooling from the melt or solvent evaporation, as sketched schematically in Figure 1. 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.
Advances in Elastomers and Rubber Elasticity by George Odian (auth.), Joginder Lal, James E. Mark (eds.)
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