Sulfur peroxides

Property Conven-tion al sulfur Semi-efficien t sulfur Efficient sulfur Peroxide Novor 950 ... 

Properties and Applieations. Aryloxyphosphazene elastomers using phenoxy and J-ethylphenoxy substituents have found interest in a number of appHcations involving fire safety. This elastomer has a limiting oxygen index of 28 and contains essentially no halogens. It may be cured using either peroxide or sulfur. Peroxide cures do not require the allyhc cute monomer. Gum physical properties are as follows (17) ... 

Additional curing is often achieved with sulfur, peroxide, or maleimide formulations. Chloro-sulfonated polyethylene has improved resistance to oil, ozone, and heat compared to many other elastomers. Applications include harrier membranes and liners, surface coatings on fabrics, automobile air-conditioner hose, electrical cable insulation, and spark-plug boots [Andrews and Dawson, 1986],... 

Pentafluorosulfurftetrafluoropentafluorosulfoxy-sulfur) peroxide, 16 131, 132 Pentafluorosulfurftetrafluorotrifluoromethoxy-sulfur) peroxide, 16 132, 133 Pentafluorosulfurftrifluoromethyl) peroxide, 16 131... 

Sulfur dioxide, hydrogen peroxide determination, 637 Sulfur peroxides, 1002-39 Sunflower oil... 

Cure - Similar to cross linking, while cure covers all types (sulfur, peroxide, radiation, etc.). 

Mechanical properties of the vulcanizates. The vulcanization of PTHF using sulfur-peroxide systems has been reported (94, 95). Representative properties of some vulcanizates are given in Table 19. 

NR/EVAc Blends Koshy et al. [1992] investigated the effect of gamma irradiation of NR/EVAc blends as a function of the blend composition and the cure system (sulfur, peroxide or mixed) (Table 11.9). Blends of NR and EVAc were prepared in a laboratory... 

NR can be vulcanized by using any of a number of vulcanizing systems, e.g, accelerated sulfur, peroxide, phenolic (resole), quinonedioxime, and others. However, by far, accelerated sulfur systems are the most used. 

Reproducibility has been observed to be problematic in the formation of PS by photoetching. In an extreme case, no PS layer was formed on the front surface, although surprisingly PS was formed on the surface of the sample that was not exposed to illumination (i.e., on the back surface) (Andersen et al. 1995). The effectiveness of surface cleaning by sulfuric peroxide mixture (SPM) treatment or by KOH etching before PS formation has been reported in Tomioka et al. (2007) and Andersen et al. (1995). 

In integrated circuit fabrication, novolac-based photoresist is used as a mask to define selectivity areas to be ion implanted. The implanted photoresist does not remain a part of the device structure and must be removed. Removal of implanted photoresist is extremely difficult because of its high degree of chemical resistance and is accomplished by harsh chemical treatment, such as with sulfuric peroxide, or by plasma ashing [23]. The toughness of implanted polymers presents a problem in this application, but it is just this chemical resistance that enables their photolithographic processing. 

Table 12.4 Tensile properties of NR vulcanized by sulfur, peroxide and radiation. ...

Sulfuric-peroxide systems are used extensively for copper surface preparation by microetch-ing the surface to provide texture and active surfaces. These formulations have been used in... 

Crosslinking of natural rubber is an essential requirement for producing desirable properties. Vulcanization of diene polymers can be achieved by using sulfur, peroxides, other reagents, or radiation. Our work involved crosslinking of natural rubber by heating with sulfur and therefore we will restrict our discussion to vulcanization by sulfur. 

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