Other Oxygen Containing Polymers

Other polymers which have been the subject of thermal degradation studies include ethylene-vinyl acetate [29, 66, 67], ethylene-vinyl alcohol [68], poly(aryl-ether ketone) [69], poly-2-vinyl-naphthalene-co-methyl maleate [34], polyphenylenes based on diethyl-benzophenone [70], polyglycollide [71-73], poly(a-methylstyrene tricarbonyl chromium [74], polytetrahydrofuran [75], polylactide [76-78], poly(vinyl) cyclohexane [79], styrene-vinyl cyclohexane [80], isopropenylacetate-maleic dianhydride [80], polyethylene glycol containing a 1,3-disubstituted phenolic group [81], poly-2-vinyl naphthalene-co-methacrylate [34], collagen biopolymers [82], chitin graft poly (2-methyl-oxazoline - polyvinyl chloride blends [83], cellulose [32, 83-88] and side-chain cholestric elastomers [89, 90]. [Pg.93]

Korshak, Thermostable Polymers, Nauka, Moscow, Russia, 1969. [In Russian] [Pg.93]

Kristkova, P. Filip, Z. Weiss and R. Peter, Polymer Degradation and Stability, 2004, 84,49. [Pg.93]

Reich and D.W. Levi, Picatinny Arsenal, Technical Report No.3194,1965. [Pg.93]

Journal of Polymer Science, Part A General Papers, 1965, 3, 859. [Pg.94]

Besides the polyether-based polymer electrolytes, the nitrogen analogues (polyimines) were also extensively studied. Various other oxygen-containing... [Pg.141]

PMMA - Red Phosphorus System. The initial reaction that was investigated was that between PMMA and red phosphorus (4-51. Phosphorus was chosen since this material is known to function as a flame retardant for oxygen-containing polymers (1 2). Two previous investigations of the reaction of PMMA with red phosphorus have been carried out and the results are conflicting. Raley has reported that the addition of organic halides and red phosphorus to PMMA caused moderate to severe deterioration in flammability characteristics. Other authors have reported that the addition of chlorine and phosphorus compounds are effective flame retardant additives (12). [Pg.181]

If the reaction mixture contains er .-oxonium ions (V) (reactions 6a, b), or oxycarbenium ions (VI) (reaction 6c), or any other oxygen-containing cations which are stoichiometrically equivalent to these (see for example, (X) and (XI) below), the ethoxide ions combine with them and are thus incorporated in the polymer ... [Pg.757]

Much research into radiation effects on polymers is done with samples sealed under vacuum. However, polymer materials may, in practical applications, be subjected to irradiation in air. The effect of irradiation is usually substantially different in air, with increased scission at the expense of crosslinking, and the formation of peroxides and other oxygen-containing structures. Diffusion rates control the access of oxygen to radicals produced by the radiation, and at high dose rates, as in electron beams, and with thick samples, the behaviour may be similar to irradiation in vacuum. Surface changes may be quite different from bulk due to the relative availability of oxygen. [Pg.10]

A lingering limitation with the present generation of reverse osmosis membranes is their limited resistance to chemical attack. In particular, membranes derived from polyamides, polyureas, and other nitrogen-containing polymers are susceptible to oxidative degradation by chlorine—the most widely used disinfectant to pretreat feed waters. Dissolved oxygen can also damage reverse osmosis membranes when catalyzed by trace heavy metals. Successful development of oxidation-resistant membranes will help reduce the complexity and costs associated with the elaborate pretreatment now required. [Pg.381]

While oxygen-containing polymers have received more attention other heteroatom-containing polymers have also been studied. In addition to homopolymers, copolymers containing more than one monomer has also received attention. Further, modifications of homopolymers by plasticizers, or crosslinking, or grafting to improve the properties of the polymers towards polymer-salt complex formation or increasing the dimensional stability of the materials has also been a focus of research. [Pg.144]

These hydroperoxides are formed as a result of intermolecular transfer of kinetic chains of oxidation. In the PP also form low molecular weight hydroperoxides such as methyl, ethyl, etc. The hydroperoxide, obtained by thermal oxidation of polypropylene, is not an individual compound, but is a combination of -OOH and other oxygen-containing groups, and the concentrations and location of these groups in the polymer are not unambiguous functions of the hydroperoxide concentration. [Pg.74]

The polymers [S]n and [SN] have been mentioned in Chapter 1. Other sulfur-containing polymers that have already been dealt with so far include those that have P-N-S and P-N-S(O) units as well as those that contain alternate S(0)N and PN units in the polymer backbone. In this section we will briefly look at polymers containing alternate sulfur and nitrogen atoms in the polymer backbone. In these pol5nners sulfur is hexavalent. An oxygen atom and an alky or an aryl group is present as the side-chain substituents on sulfur. [Pg.205]

Acrylic polymers are based on esters of acrylic acid and methacryhc acid and copolymers are very common. Figure 13 shows the positive ion spectrum of poly(methyl methacrylate) (PMMA). Compared with the other oxygen-containing side-chain polymers discussed above, the spectrum appears to be influenced to a... [Pg.8057]

In the method for determining chlorine in chlorobutyl and other chlorine-containing polymers, [6] the sample is combusted in a 1-2 litre oxygen-filled combustion flask containing 0.01 M nitric acid. After combustion, the flask is allowed to cool and 0.01 M silver nitrate added. The combustion solution containing silver chloride is evaluated... [Pg.8]

Method 2.2 Determination of Chlorine in Chlorobutyl and Other Chlorine Containing Polymers. Oxygen Flask Combustion - Turbidimetry [6]... [Pg.75]

This oxygen flask combustion-turbidimetric method is capable of determining total chlorine in amounts down to 5 ppm in chlorobutyl and other chlorine containing polymers. [Pg.75]

FR systems. The phosphorus-based systems appear to function best with oxygen containing polymers. The char is believed to be a complex phosphorus oxide based coating that blocks oxygen from coming into contact with monomer or other flammable materials. The melamine-based systems form chars that are based on nitrogen as well as phosphorus in the case of melamine phosphate systems. [Pg.493]

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