Thermoset resin cross-link

It is a fine all-purpose fiber lubricant and softener and is particularly recommended for use in combination with thermosetting resins and cross-linking agent to produce a smooth hand and also to minimize tearing and tensile strength loss and Improve resistance to abrasion. 

Table 3 summarizes the key properties of selected major types of thermosetting resins. Their cross-linking reactions can occur by radical chain addition... 

Thermosetting resins 1. Cross-linked polyester (a) Cold cured polyesters... 

Thermosetting resin n. (1) A resin that cross-links and becomes insoluble in a solvent after curing (usually with the aid of catalysts and/or heat). (2) A resin... 

Tear speed = Cross head speed Speed of which samples are subjected to destruction in the testing equipment. Normally it is between 5 and 300 mm/min Thermosetting resins Closely cross-linked macromolecules that do not undergo plastic deformation even at high temperatures Thick-layer adhesive bonding Elastic bonding application where the thickness of the adhesive layer exceeds 3 mm... 

Alkyds are formulated from polyester resins, cross-linking monomers, and fillers of mineral or glass. The unsaturated polyester resins used for thermosetting alkyds are the reaction products of polyfunctional organic alcohols (glycols) and dibasic organic acids. 

One-Stage Resins. The ratio of formaldehyde to phenol is high enough to allow the thermosetting process to take place without the addition of other sources of cross-links. 

Two-Stage Resins. The ratio of formaldehyde to phenol is low enough to prevent the thermosetting reaction from occurring during manufacture of the resin. At this point the resin is termed novolac resin. Subsequently, hexamethylenetetramine is incorporated into the material to act as a source of chemical cross-links during the molding operation (and conversion to the thermoset or cured state). 

The commonly used resins in the manufacture of decorative and industrial laminates ate thermosetting materials. Thermosets ate polymers that form cross-linked networks during processing. These three-dimensional molecules ate of essentially infinite size. Theoretically, the entire cured piece could be one giant molecule. The types of thermosets commonly used in laminates ate phenoHcs, amino resins (melamines), polyesters, and epoxies. 

Poly(methyl methacrylate) and poly(vinyl acetate) precipitate from the resin solution as it cures. This mechanism offsets the contraction in volume as the polyester resin cross-links, resulting in a nonshrinking thermoset. Other polymer additives such as poly(butylene adipate) provide similar shrinkage... 

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