ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Partly modified chlorinated polypropylene (CPP) with dimethyl phosphonate side groups was prepared by reacting trimethyl phosphites and CPP at 115°C (Arbuzov type reaction). Products having different phosphorus and chlorine content were obtained, and the reduction of number-average molecular weight M̄n with the extent of the degree of substitution was studied. The dimethyl phosphonate groups incorporated were studied by IR spectroscopy (P—O—C at 9.6 μ and P → O at 8 μ). All products had a yellow color that may be attributed to double bond formation caused by a side dehydrochlorination reaction. Some differences of thermal stability were observed from the DSC and TGA thermograms, and no significant Tg value changes between phosphorylated products and CPP were indicated in the thermomechanical spectra. The flame retardancy of the phosphorylated products and the blends obtained by the addition of partly phosphorylated CPP to polyhydrocarbons such as polyethylene (PE), polypropylene (PP), and polystyrene (PS) was studied using the oxygen index test. The flame retardancy of these blends was compared with the flammability of the same polyhydrocarbons containing CPP. From this comparison it is concluded that the partly phosphorylated CPP is more effective as a flame retardant additive for PE, PP, and PS than itself.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1983.070280111
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