Organic Polymer Chemistry: An Introduction to the Organic by K.J. Saunders

By K.J. Saunders

This e-book bargains with the natural chemistry of polymers which locate technological use as adhesives, fibres, paints, plastics and rubbers. For the main half, in basic terms polymers that are of business value are thought of and the first target of the ebook is to narrate theoretical features to commercial perform. The publication is principally meant to be used by way of scholars in technical associations and universities who're focusing on polymer technological know-how and through graduates who require an advent to this box. numerous first-class books have lately seemed facing the actual chemistry of polymers however the natural chemistry of polymers has now not got rather a lot awareness. In acceptance of this example and as the points of polymer chemistry are frequently taught individually, this e-book offers particularly with natural chemistry and subject matters of actual chemistry were passed over. additionally, during this method the publication has been saved to an affordable dimension. this isn't to claim that integration of the 2 parts of polymer technological know-how is bad; to the contrary, it really is of the maximum significance that the inter-relationship should still b~ liked. I desire to checklist my due to my colleagues with whom i've got had many beneficial discussions, quite Mrs S. L. Radchenko. I additionally thank pass over E. Friesen for acquiring many books and articles on my behalf and Mr H. Harms for encouragement and suggestions. i'm additionally thankful to Mrs M. Stevens who skilfully ready the manuscript. division of Chemical and Metallurgical expertise, Ryerson Polytechnical Institute, ok. J. S.

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Extra resources for Organic Polymer Chemistry: An Introduction to the Organic Chemistry of Adhesives, Fibres, Paints, Plastics, and Rubbers

Example text

Since the factors underlying tacticity in polymers are the same as those which give rise to optical activity in low molecular weight compounds, it is apparent that there exists the possibility that some polymers may be optically active. In practice, common vinyl polymers are not optically active. This observation is readily explained in the cases of atactic and syndiotactic polymers where there are equal numbers of d- and /- configurations in each polymer molecule and internal compensation results.

One suggested mode of polymerization with metal oxide catalysts envisages reaction in a chemisorbed monomer layer. T-electrons and unpaired electrons of the transition metal. Initiation involves the supply of an unpaired electron from a metal atom to an adjacent adsorbed monomer molecule; propagation then ensues by reaction of the product with a neighbouring adsorbed monomer molecule. The process may be depicted as follows: H2C,=C. H 2 H 2 C=CH \ / 2 -M-·M·----MH2C-CH2 "/ : -M-M H2C=CH2 \ / M- H C-CH 2-CH2-CH 2 2 _J_M ~-etc.

In this process, feed-stocks are cracked by heating in the absence of a catalyst. The primary objective of the process is generally to obtain high yields of olefins and thermal cracking is now the main commercial source of olefms. Suitable feed-stocks, which contain mainly C 1_ 4 paraffins, are obtained from the reforming and catalytic cracking processes described above and from the gas fraction of petroleum distillation. The hydrocarbon vapour, which may be diluted with steam, is heated to 700-900°C for a few seconds and then rapidly quenched.

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