Get Handbook of Thermoset Plastics PDF

By Hanna Dodiuk, Sydney H Goodman

ISBN-10: 0815514212

ISBN-13: 9780815514213

ISBN-10: 0815517777

ISBN-13: 9780815517771

This e-book is particularly aimed to assist engineers, chemists, physicists, and scholars who desire normal, in addition to technical, information touching on every little thing from ancient information and terminology to hugely particular curing and staging data.

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Extra resources for Handbook of Thermoset Plastics

Example text

Phenolic resins arc considcrcd to be gcncral-purpose thermosets though they can bc compounded into cnginecring structural materials. 85 per pound u31t2Glt2’l depending on make and grade. 07 billion pounds (in 1993). Phenolic resins (and thcrmosets in general) arc brittle without tillers. It is customary to use tillers and other additives to achieve their desired properties and characteristics. rlation is the essence. Table 2- 1 presents the typical properties of different fomls of phenolic resins, and Table 2-2 gives the parts per hundred resin (phr) composition of different formulations for phenolic molding resins.

Phcnolic resins can be easily molded into (1) intricate shapes and to finished dimensions with littlc or no extra finishing touches. Very good dimensional accuracy and stability. Phenolic mol(2) ding resins have very good dimensional accuracy and stability at normal atmospheric conditions. /in. and their tilled compounds have a coefficient of linear thermal expansion of about 8-45s 10” in/in. “C. Typically, molding compounds based on novolacs are twice more dimensionally stable than resole-based molding compounds.

The water hydrolyses the chlorobenzene, passed over hot silica catalyst at 5OO”C, to phenol and HCl. when CdFe C,H, + benzene HCI +-&O, hydrogenchloride C,H,Cl + Hz0 chlorowater benzene _) catalyst + 200”-300°C C,H,Cl + H,O water chlorobenzene SiO, + catalyst + 5oo”c C,H,OH phenol + HCl hydrogen chloride Dow Process The Dow process, established in 1920, uses the direct vigorous reaction of chlorobenzene and sodium hydroside solution at 300°C and 4000 psi: C,H,Cl chloro benzene + Formaldehyde NaOH sodium hydroxide 300°C + 4000 psi C,H,OH phenol + NaCl sodium chloride (CH 20) Formaldehyde is produced by the controlled catalytic oxidation of methyl alcohol (methanol).

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Handbook of Thermoset Plastics by Hanna Dodiuk, Sydney H Goodman

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