Reference

Low-temperature postradiation grafting of vinyl fluoride onto secondary poly(tetrafluoroethylene) and poly(vinyl chloride)

Low-temperature postradiation grafting of vinyl fluoride onto secondary poly(tetrafluoroethylene) and poly(vinyl chloride).Some chemicals with cas registry numbers like 24937-99-3 and 9002-84-0 are also used. Zufarov, A. A.; Kiryukhin, D. P.; Asamov, M. K.; Barkalov, I. M. (Tashk. Gos. Univ., Tashkent, USSR). Uzb. Khim. Zh., (6), 43-6 (Russian) 1983. CODEN: UZKZAC. ISSN: 0042-1707. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 36, 37 Exposure of PTFE [9002-84-0] wastes or PVC [9002-86-2] to vinyl fluoride (I) [75-02-5] at 273 K, cooling the system to 77 K, irradn. at this temp. with g rays, and raising the temp. to room temp. level resulted in grafting of I on the polymers. The amt. of the grafted poly(vinyl fluoride) depended on the monomer-polymer ratio, duration of the exposure to I at 273 K, and irradn. dose, reaching the level of 6-7% (based on wt. of starting polymer). The supporting expts. established that low-temp. sorption of I on PTFE wastes and PVC also depended on the duration of the exposure of the polymers to I at 273 K reaching ~14% for PTFE wastes (exposure 40 h) and ~24% for PVC (exposure 50 h). .

Effect of reactor material on properties and quality of suspension poly(vinyl chloride)

Effect of reactor material on properties and quality of suspension poly(vinyl chloride). Ponomareva, O. V.; Burlakova, G. I.; Bubnova, T. V.; Kamenko, B. L. (USSR). Plast. Massy, (1), 47-9 (Russian) 1984. CODEN: PLMSAI. ISSN: 0554-2901. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Polymn. reactors of steels St3 [39296-41-8], 07Kh13AG 20 [67185-15-3], 14Kh17N2 [12793-24-7], and 10Kh14G14N4T [37269-29-7] were tested in the prodn. of suspension PVC [9002-86-2]. The highest content of Fe in PVC was obsd.Several substances with their cas registry numbers 37269-29-7 and 9002-86-2 may be metioned in this study. in St 3 reactors, although the Fe content was within the limits of std. requirements. The polymer was slightly colored due to the formation of rust at the reactor walls. The thermal stability decreased sharply at 0.002% Fe, but remained within the permissible limits at ￡0.1% Fe. The vol. resistivity of powd. PVC was not affected by ￡0.5% Fe. The examd. steels can satisfactorily replace the more expensive Cr-Ni and Cr-Ni-Mo steels for the polymn. .