Condensation polymers background

Robert M. Secor. Telephone interviews, 2000-2001. Source for Sylvia Moore s background and end of their affair club memberships Julian Hill visits hospital and learns Carothers spent the night there before suicide Carothers grades and freshman chemistry class Carothers rejects Neoprene medal European doubts about Carothers condensation polymers and young Flory s opinion that polymers were of dubious scientific value. 

We begin by exploring the two major types of synthetic polymers used today—addition polymers and condensation polymers. This provides a good background for the discussion of plastics in Chapter 18. 

There are many reasons why mass spectrometry misses the high masses. One of these is that the detectors measure in a linear mass mode which soon loses small numbers of molecules in the background noise, contrast this with SEC which collects logarithmically with mass. The detectors are often mass sensitive and this can be corrected to some extent by applying a data manipulation function. Other factors which need to be taken into consideration are loss of low mass regions due to either volatility or ionization problems. This is particularly apparent when looking at condensation polymers or acrylics from catalytic chain transfer polymerization. There are also effects on the mass distribution due to the laser power used thus the minimum laser power is often required but not always applied. 

The book begins with terms commonly used in polymer chemistry and biochemistry with respect to various substances, such as homopolymers, copolymers, condensation polymers, addition polymers, proteins, nucleic acids, and polysaccharides (Chapter 1), followed by descriptions of the methods used to create these substances (Chapter 2). On the basis of classroom experience, Chapter 2 is a welcome introduction to students who have never been exposed to the basic methods of polymer and biopolymer syntheses. The first two chapters together comprise the essential background materials for this book. 

Addition polymerization is usually such a rapid process that only monomer and final polymer chains are present. Very little of the active material in the system is oligomeric, that is, consisting of only a small number of linked monomer units en route to polymer, at any one point in time. Also, in addition polymerization the whole monomer molecule adds to form polymer. No small molecule is lost in the process. Further details of the polymerization processes involved and the structural properties of the products obtained from addition polymerization are discussed in Chaps. 22 and 23. This chapter will focus on the background theory of synthetic polymers, and condensation, or step-growth, polymerization. 

In many publications my colleagues and myself have attempted to give quite an unequivocal answer to this question. The polymer state" may be considered to be a peculiar form of condensation of molecules, and the transition into this state may be regarded as a special fundamental phase transition on the background of which usual phase transitions take place. I his concept may be proven and developed just for flexible-chain fmlymers capable of the manifestation of rubber-like elasticity, i.e. of reversible 1000-fold and greater deformations which involve forces of the entropy nature. 

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