Reference

Preparation of cured urea-formaldehyde resins of low formaldehyde emission

Preparation of cured urea-formaldehyde resins of low formaldehyde emission. Dutkiewicz, Jacek (Fac. Polytech., Univ. Lubumbashi, Zaire). J.Chemicals with cas numbers 108-19-0 and 25014-12-4 also play role. Appl. Polym. Sci., 29(1), 45-55 (English) 1984. CODEN: JAPNAB. ISSN: 0021-8995. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 59 Several polymers contg. amino or amido groups and biuret [108-19-0] were tested as additives for urea-HCHO resin (I) [9011-05-6] in order to neutralize its inherent acidity and combine free HCHO [50-00-0] released upon hydrolysis of cured polycondensate. Each modifier was incorporated in liq. methylolureas at wt. ratios of 1:100, 2:100, and 3:100 prior to curing with the aid of AcOH [64-19-7]. During 10 days of maintaining aq. suspensions of the ground-up resultant solid resins at ambient temp., a neutralizing effect was exhibited most visibly by polyacrylamide (II) [9003-05-8], polymethacrylamide [25014-12-4] and biuret, the test with chitosan [9012-76-4] and casein giving results slightly different from those obtained for the control nonmodified cured I. II, biuret, and casein were excellent inhibitors of HCHO release from the hardened resins which were suspended in water at ambient temp. On the other hand, chitosan did not reduce the evolution of HCHO but, instead, augmented it when its content was 1 g/100 g of the original liq. resin before curing. .

Induced optical activity of acridine orange bonded to optically active poly(methacrylic acid) by radical polymerization in the presence of chitosan

Induced optical activity of acridine orange bonded to optically active poly(methacrylic acid) by radical polymerization in the presence of chitosan. Kataoka, Seiichi; Ando, Tadanao (Gov. Ind. Res. Inst., Ikeda 563, Japan). Polym. Commun., 25(1), 24-6 (English) 1984. CODEN: POCOEF. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Section cross-reference(s): 35 Induced CD of acridine orange with optically active poly(methacrylic acid) (I) [25087-26-7] obtained by radical polymn. in the presence of chitosan [9012-76-4] was investigated at pH 2.60-6.48. The I obtained was obsd. to be optically active, even after removal of chitosan by hydrolysis with concd. HCl, followed by oxidn. with Na metaperiodate. When the pH was 2.60, the absorption band in the induced CD spectrum was obsd. and then disappeared at a pH of 6. 9012-76-4 and 65-61-2 which are cas registry numbers of substances are two of reagents here.48. Based on induced CD spectra, the optical activity obsd. was considered to be due to conformational asymmetry of the main chain of the obtained I. .