Polyfvinyl butyral

Fig. 18. Yield strengths in three-point bend tests of highly filled composites of polyfvinyl butyral) and silica particles treated with methylsilane and octylsilane coupling agents to varying degrees of surface coverage vs. work of adhesion measured independently using IGC. Redrawn from ref. [90].

Polyfvinyl butyral) is used as the plastic laminate in the preparation of automobile windshield safety glass. How would you synthesize this polymer ... 

A small amount of a Polyfvinyl butyral) solution is spread on a glass plate and evaporated slowly to create a thin film.Then the breaking behavior of the laminated glass plate is determined. Polyfvinyl butyral) foils are used for the manufacture of safety glass, for example, windshields in cars. 

Historical Development. The importance and advantages of ethyl silicate zinc dust paints were recognized and intensively investigated in the late 1940s [2.187], [2.188]. The fundamental work of Lopata and Keithler [2.189] on the partial acid hydrolysis of tetraethyl orthosilicate and the use of the product as a zinc dust paint binder was followed by attempts to improve the application properties and quality of the coatings (e.g., by adding polyfvinyl butyral) [2.190], alkyl titanates [2.191], borate esters [2.192], or trialkyl phosphates [2.19. ]. 

The products are amorphous resins whose rigidity and softening point depend on the aldehyde used. Polyfvinyl butyral), with the larger side chain, is softer than poly(vinyl formal). Since the reaction between the aldehyde and the hydroxyl groups occurs at random, some hydroxyl groups become isolated and are incapable of reaction. A poly(vinyl acetal) molecule will thus contain ... 

The solution of polyfvinyl butyral) is diluted with methanol and the polymer precipitated by the addition of water during vigorous agitation. The polymer is then stabilised, washed and dried. 

Automobile windshields are specifically designed so that they do not create free shards of glass when broken. This is accomplished in very much the same way that bullet-resistant glass is manufactured, as described in the chapter opener. Two sheets of glass are pressed together with a thin layer of polymer between them. The polymer most often used is polyfvinyl butyral), often called PVB. 

Polyfvinyl acetate), uses of, 242 Poly(vinyl butyral), uses of, 1222 Poly(vinyl chloride), plasticizers in, 1216... 

Polyfvinyl ethers) tetrahydrofuran. (butyrals in 9 1 chloroform-methanol mixture) methanol... 

Poly(vinyl formals) and poly(vinyl butyrals) are of importance in the coating industry. Commercial products differ in the degree of polymerization and acetalation, but especially in the residual polyfvinyl alcohol) content. 

ABS, acrylonitrile butadiene styrene EPDM, ethylene-propylene diene monomer HDPE, high-density polyethylene LDPE, low-density polyethylene LLDPE, linear low-density polyethylene n.a., not available PET, poly(ethylene terephthalate) Polyvinylbutyral, poly(vinyl butyral) PVC, polyfvinyl... 

---