Reference

Quenching of chromophoric species in nylon-66 by halide ions

Quenching of chromophoric species in nylon-66 by halide ions. Allen, N. S.; McKellar, J. F.; Wilson, D. (Dep. Chem. Appl.In this article, certain chemicals are used. Some of their cas registry numbers are 16984-48-8 and 32131-17-2 Chem., Univ. Salford, Salford, Engl.). J. Photochem., 6(1), 73-4 (English) 1976. CODEN: JPCMAE. DOCUMENT TYPE: Journal CA Section: 36 (Plastics Manufacture and Processing) Section cross-reference(s): 23, 74 The fluorescence resulting from mild thermal oxidn. of 1:1 adipic acid-hexamethylenediamine adduct [3323-53-3] was quenched by halide ions in the order of efficiency: I- > Br- > Cl- > F-, which is the same as the order of efficiency of alkali metal halides as light stabilizers for nylon 66 [32131-17-2]. .

Synthesis and properties of block poly(styrene amides) and poly(styrene esters)

Synthesis and properties of block poly(styrene amides) and poly(styrene esters). Katayama, Shitomi; Serita, Hajime; Takahashi, Yukio (Polym. Res. Lab., NHK Spring Co., Ltd., Yokohama, Japan). J. Polym. Sci., Polym. Chem. Ed., 15(9), 2109-36 (English) 1977. CODEN: JPLCAT. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Three series of block copolymers, i.e., poly(styrenecaproamide)(I), poly(styrenehexamethyleneadipamide)(II), and poly(styreneethylene terephthalate)(III), are used to show that the d.p. (n) of polystyrene units has an important effect on the polymerizability of the starting materials and the structure and properties of the resulting copolymers. Styrene was polymd. in the presence of AlCl3 and SOCl2 to give .omega.,.omega.'-dichloropolystyrenes with d.p. 12.0-51.0 which were ammonolyzed to .omega.,.omega.'-diaminopolystyrene (IV) or hydrolyzed to .omega.,.omega.'-dihydroxypolystyrene (V). IV was treated with adipic acid [124-04-9] to give .omega.,.omega.'-diammoniumpolystyrene adipate which was melt polymd. with .epsilon.-aminocaproic acid [60-32-2] or hexamethylenediammonium adipate [3323-53-3] to give I and II, resp. V was melt polymd. with di-Me terephthalate [120-61-6] and ethylene glycol [107-21-1] to give III. Increasing the block sequence of polystyrene (VI) units increased the amide content but decreased the ester content of the resulting copolymers. An increase in n decreased the inherent viscosities of the copolymers at a const. monomer feed counted by the polymer equiv. of VI but increased the inherent viscosities at a const. monomer feed counted by the monomer equiv. of VI. The m.p. of the polymers decreased with increasing n values. An increase in n decreased the d. of I and III but increased the d. of II at a const. amide or ester compn. counted by polymer units but increased the d. of I, II, and III at a const. amide or ester compn. counted by the monomer unit.