A Chloronaphthalene

Picrates. Some halogen derivatives of the higher aromatic hydrocarbons form picrates (for experimental details, see under Aromatic Hydrocarbons, Section IV,9, 1), for example, a-chloronaphthalene (m.p. 137°), a-bromonaphthalene (m.p. 134°), and p-bromonaphthalene (m.p. 86°). 

In many extremely important cases, the analogy between a group of symmetry operations and a group of real numbers is more than superficial. For example, consider the molecule a—chloronaphthalene ... 

The relation between [rf and molecular dimensions for branched polyethylenes has been investigated experimentally by several groups. The most extensive study is that of Hama and co-workers (42), who measured . by light-scattering in a-chloronaphthalene for fraction of two LDPE and two HDPE samples. They calculated the unperturbed values of [Pg.44]

A cylindrical glass tube containing the immersion liquid and the piece of glass of which the refractive index has to be determined, is placed between the two diaphragms. The immersion liquid consists of petroleum ether (or dioxane) and a-chloronaphthalene. The temperature of the immersion liquid is controlled by circulating water around the tube. 

Polypropylene (isotactic) l a Isoamyl acetate Toluene a-Chloronaphthalen e Decalin Tetralin... 

Polyimides. The reaction of tetraphenylcyclopentadienone (V) (17) with N-phenylmaleimide (VI) in refluxing a-chloronaphthalene (263°C.) for 1.5 hours or refluxing, 1,2,4-trichlorobenzene (213°C.) for 18 hours provides a quantitative yield of adduct VII (Reaction 7). Similarly, V reacts with N,N -o- and p-phenylenebismaleimide (Villa,b) (8) to afford the diadducts IXa,b (Reaction 8). 

Poly(chloro-p-xylylenes) containing (in theory) about 5, 10, and 20% butyl-p-xylylene were prepared in this way (see illustration on p. 650). The crystalline melting points of the products (XVII) were in the range 220°-250°C. compared with 290°C. for pure poly (chloro-p-xylylene). Solubility characteristics of the products and a sample of poly (chloro-p-xylylene) were studied by heating in a-chloronaphthalene. The solution temperature is the minimum temperature required to dissolve the product with slow heating. The gel temperature is that at which the solution of the product in a-chloronaphthalene sets to a gel on gradual cooling. Results were as follows ... 

Figure 1. Comparison of cos 6 vs. yLV plots for the n-alkanes (—A—) and the test liquids of this study (—O—) on a triethoxy silane film. (VTES on flamed silica after 20 hrs. from a 5% solution in a-chloronaphthalene)...

Figure 3. The failure of QH,20 to correlate with the organic liquid wetting data in yLV-cos 0 plots. (ETES on air-dried silica after 2 hrs. from 1% solution in a-chloronaphthalene )...

Figure 7. The change in Ho0 in the water desorption test for VTES films on silica (1% VTES in a-chloronaphthalene )...

VTES films could be obtained on a-alumina by retraction from VTES-(a)-chloronaphthalene solutions. This contrasts with the failure of ETES solutions to retract from a-alumina. However, neither the organic liquid or water would give stable contact angles on the films formed by VTES. 

The adsorption process was apparently complete within 20 hours since the same yc and 0H2o values were obtained at 48 hours and 72 hours. Note that without ETES or VTES present, solutions of these acids and bases in a-chloronaphthalene did not retract from the silica test plates. 

Figure 8. Adsorption of ETES in the presence of acetic acid. The change in apparent critical surface tension (A) and water contact angle (B) with adsorption time for films on flamed silica (—O—) and air-dried silica (— —). (1% ETES and 0.03% acid in a-chloronaphthalene )...

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