Chemicals, resistance tensile strength, loss

Dimethyldichlorosilane. Because dimethyldichlorosilane has been polymerized to a silicone polymer on cotton fabrics to impart stain and water resistance and can be applied as a vapor, this agent was examined as a possible consolidant. This treatment also improves fabric hand, resistance to chemicals and weathering, resistance to abrasion (by reducing friction), and reduces the tensile strength loss when resin finishes are applied all factors that should make the material a desirable and effective consolidant. The reactions involved are as follows ... 

The environmental resistance listed for tensile strength loss in Tables 3-19 and 3-20 includes a tabulation by rank of the resistance of the sample to a particular chemical. The lower the number, the better the chemical resistance. If a composite was observed to have less than 3% loss in tensile strength, it was deemed excellent (E) between 3% and 10%, acceptable (A) between 10% and 25%, fair (F) and over 25%, unacceptable (X). ... 

Polyphenylene sulfide also possesses unusual chemical resistance. To demonstrate this resistance, injection-molded tensile bars of cured polymer were exposed to a representative groups of reagents at 200°F for 24 hours. After exposure, the bars were weighed to determine weight gain or loss, and the tensile strength determined. The results of these experiments are given in Table I. 

Table 9.12 Chemical resistant loss in tensile strength and flexural strain of glass fiber/thermoplastic (wt%) (courtesy of LNP)...

Cross-linking n. The stabilization of cellu-losic or manufactured fibers through chemical reaction with certain compounds in such a way that the cellulose or manufactured polymer chains are bridged across or cross-linked . Cross-linking improves such mechanical factors as wrinkle resistance. Random cross-linking in manufactured polymers is undesirable and leads to brittleness and loss of tensile strength. 

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