Document BRYrvL2mXVRe5XRaJ1w7VOyaj

H.F.GOODRICH CHEMICAL C Mi'ANY DEVELOPXENI CKNTF.h Tot R. M. Kreager L.H.Conklin - G.Kletecka V. A. Reed F. W. Shaver A. R. Berena E. A. Collins L. B, Crider F. E. Krause L. A. Bennett Technical Council Central Technical File Date: May ' ? rcm: J. W j >*. Sv--ary of McGill Polymer Discussions THE STABILITY OF PQLYVIHYL CHLORIDE McGill University Montreal, Quebec May 3, 1966 nTbe Study of Polyvinyl Chloride hy High Resolution MR Spectroscopy". Dr. Frank Borey, Bell Telephone Laboratories, Murray Hill, lev Jersey. Dr. Borey gave a very interesting talk on the stereo chenical structure of PVJ as determined by HO. His initial work on stereo chemistry of polymers was done with poly methyl meth acrylate because it gives a much simpler spectrum than JVC. Polywetbyl methacrylate has only one kind of hydrogen on the chain backbone to account for <*3 The FVC spectrum structure assigned by using model compounds and FVC nada from dentemtedTinyl chloride, the results showed hydrogen on the seme carbon e hydrogen OD oO Cl^ ^*2 8MDI0TACTCC EHvmoMnrT -3- "Thermal Decomposition of Polyvinyl Chloride". Tr. Alain Guyot, Institut, ie Recherchei sur la Catalyse, Villeurbanne, France. Although Dr. Guyot'a talk vu interesting, it was hard to follow because of his poor English and poor slides. He talked on three types of thermal degradation. 1. HC1 evolution. 2. Color formation. 3. Crosslinking. Dr. Guyot discussed the role of oxygen in the degradation. He believes oxygen reacts with the double bonds in degredsd PVC in en exothermic reaction which raises the local temperature in the PVC. This can account for an increased rat^ HC1 evolution because of the increased temperature end for less color formation because oxygen Is eliminating conjugated double bonds. In polymer solutions oxygen does not increase the rate of BC1 evolution because the heat of reaction is taken up by the solvent and there is no increase in local temperature. Other evidence is that degraded JVC increases in weight when exposed to oaqrgen apparently from oxygen addition. Studies of decc^osltlon of model co^ounde such as - C&2 - CH CH - 1003 zw CHg CHg CH^ CHOI CH CH I Cl -C Cl -w OBI - CH - CH The poor quality of the slide made it difficult to see all the structures tested. shows that the chloride which would be formed by a double bond in the middle of a polymer is the least stable of structures studied. Chain trans fer reactions which may form a double bond on the chain end are no* as unstable as the allyllc chloride in the middle of a chain. 12939 BFG39285 -4- "Unusual Behavior of Vinyl Stabilizer* Brooklyn, N. Y. Hr. Arthur Hecker, Argus Cheir.ical Hr. Hecker listed a considerable amount of odd or unexpected behavior in stab ill; --rPVC interaction* lut technical reasoning behind the unusual behavior was :oispl-lacking. I will also pass on the information without interpretation. 1. PVC with lead silicate stabilizer forms much color but little PVC degrada tion as measured by chloride formation. But PVC with lead silicate and Cadmium stearate forms little color and has much chloride formation. 2. The same is true of Barium-Cadmium systems. Barium Laurate stabilized r". ? font severe color but little chloride. Barium Laurate, Cadmium Laurate mixture forms little color but much chloride. 3. Gaseous HC1 at room tes^erature discolors stabilized FVC confounds. 4. Static oven heat stability is bettar for high molecular weight PVC. Mill stability end brabender stability is batter for low molecular weight resins. "Processing of Polyvinyl Chloride". Mr. W. Allan Rabb, Shawlnlgan Chemicals, Montreal. Nr. Rabb described the processes for FTC for people who are not knowledgeable in this area. Most of the processes are well known to everyone in BPS so I will net describe them In detail. 1. Brabender nixing. 2. Hanschel mixing. 3. Milling. 4. Calendering. 5. Sheet extrusion. 6. Shape extrusion. 7. Klectraatatlc coating. 8. Haxlhle extrusion. 9 Tluidised bed coating. "Simple Monitor Devices far Heather Bxpoeure of Plastics". Dr. William Brucksc*, latlonal Bureau of Standards. Dr. Bruckach is ~Hng devices to accurately measure the weather. His monitor itvi ne asuret 1. Radiation of sun-langleys. 2. Temperature on a black-body and white-body* 3. Rain and dew - by measuring the time the surface is wet. BFG39286 t. U. Contaminants - atmosphere. 5. Stress - amperiodic. Dr. Brucksch hopes to be able to correlate weathering between various cities or. 1 indoor exposure. His indoor weathering device will be a tank of water wit-, immersed samples so he can control temperature, contamination, and light radia*i r. AJ. W. Simners cl cc: File (3) ?0 * o o .c? 1