Resist cross-linked

Miscellaneous. Flame-resistant cross-linked polyethylene can be made with a number of fluoroborates and antimony oxide. This self-extinguishing material may contain the fluoroborates of NH, Na", K", Ca ", Mg ", Sr ", or Ba " in amounts of 4—20% (76). Magnesium fluoroborate cataly2es the epoxy treatment of cotton fabrics for permanent-press finishes (77) (see Textiles). 

Based on the data in Table 1, the average number of methylene groups between double bonds, ie, the functionaHty, for the typical linseed oil is 3.6 it is a drying oil. The corresponding number for soybean oil is 2.07 it is a semidrying oil. The higher the average functionaHty is above 2.2, the more rapidly a solvent-resistant, cross-linked film forms on exposure to air. 

Amongst the important heat-resisting cross-linked polymers are the phenolic resins (chapter 23), the Friedel-Crafts resins (also Chapter 23), the polyphenylenes (Chapter 21) and certain polysulphides (also Chapter 21). One problem of these materials is that they tend to be brittle. This is overcome in part... 

Acid generation in photoresist films add photogeneration vs. dose, 3233/ acid present after irradiation, 32,34r add present before irradiation, 32 quantum yield, 3234 Acid hardening resin resists cross-linking adivation energy determination, 87,89 cross-linking chemistry, 87 determination of acid generated, 87-88 effect of postexposure bake temperature and time, 87... 

The first LDPE/HDPE blends were patented by du Pont de Nemours before Z-N polymers became available (Roedel 1961). The blend comprised an experimental HOPE (p = 0.939-1.096 g mL Tm 120 °C) obtained by polymerizing C2 in its own medium at T 0 °C and P 31 MPa, using, e.g., a hydroxy-cyclohexyl-L-hydroperoxide catalyzed by ferrous chloride tetrahydrate. The blend showed 50 % moisture permeabDity of that by LDPE. In 1958 Phillips Petroleum patented PE/PE blends, either cross-linked in electron accelerator or not (Canterino and Martinovich 1963 Nelson 1964). Mitsubishi disclosed PO blends comprising vinyl-trimethoxysUane-grafted polyolefin (PP, LDPE, EPR, or EVAc) and ethylene-acryloyloxy tetramethylpiperidine copolymer. These water-cross-linkable resins were used for the manufacture of weather-resistant cross-linked PO pipes in outdoor applications (Ohnishi and Fukuda 1993). Thermally reversible cross-links (based on ionic interaction between maleated- and glycidyl methacrylate-grafted polyolefins) were also proposed (Okada 1994 Okada and Masuyama 1994). 

Vinyl-tiimethoxysilane-grafted polyolefin, PO (e.g., PP, LDPE, EPR, or EVAc), was blended with and ethylene-acryloyloxytetramethylpiperidine. The water-doss-linkable blends were found useful for manufacturing weather-resistant cross-linked polyolefin pipes for outdoor applications... 

The water-cross-linkable blends were found useful for manufacturing weather-resistant cross-linked polyolefin pipes for outdoor applications... 

Negative-Tone Imaging Chemistry. In many negative-tone CA resists cross-linking is employed to effect insolubilization of the exposed pattern. In the... 

Nedjar [26] have reported on the measurement volume of resistivity cross-linked polyethylene grades used in high-voltage cables and the effect of thermal aging on the electrical properties of the cable. 

The polymer was found to be an insulator (R > 10 ° ohm-cm). When the sample was heated above 60 °C, evolution of small fragments occurs with a concomitant dramatic drop in resistivity, cross-linking and generation of unpaired spins. The ESR of heat treated samples showed a broad 800 G wide line whereas the untreated sample showed no resonance signals. Another study [232] on poly(methylene ditelluride), prepared by using the boroethyrate procedure, revealed that its conductivity increased by four to nine or rs of magnitude on... 

Ponomarev, I.I., Sinichkin, M.K. Polytricycloquinazolines - a new class of thermostable and heat-resistant cross-linked polymers. Poly Sci. Ser. A 38, 951-953 (1996)... 

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