NOPR Collection:

Synthesis and dyeing characteristics of 2-arylazo-3-dicyanomethyleneindan-1-one

2016-07-20T05:27:56Z

Title: Synthesis and dyeing characteristics of 2-arylazo-3-dicyanomethyleneindan-1-one Authors: Rangnekar, D W; Kamat, P Y Abstract: 3-Dicyanomethyleneindan-1-one (II), prepared by the condensation of indan-1,3-dione (I) with malononitrile, was coupled with three representative 4-substituted phenyldiazonium salts (III) to give 2-arylazo-3-dicyanomethyleneindan-1-ones (lVa-c). These compounds when applied on polyester fibres gave bright yellow to orange shades with excellent pick-up, moderate light fastness and very good sublimation fastness. Page(s): 54-56

Synthesis of ethyl α-substituted-β-(2-methoxyquinoxalin-6-amino) acrylates and 3-methoxypyrido [3,2-f]quinoxalin-10(7H)-ones and their application on polyster fibres

2016-07-20T05:25:32Z

Title: Synthesis of ethyl α-substituted-β-(2-methoxyquinoxalin-6-amino) acrylates and 3-methoxypyrido [3,2-f]quinoxalin-10(7H)-ones and their application on polyster fibres Authors: Rangnekar, D W; Tagdiwala, P V Abstract: 6-Amino-2-methoxyquinoxaline (I) obtained from quinoxal-2-one by nitration, chlorination, methoxylation and reduction was condensed with conjugated enol ethers such as diethyl ethoxymethylenemalonic ester (IIa) and ethyl ethoxymethylene(cyano)acetate (IIb) to give ethyl α-substituted-β-(2-methoxy-quinoxalin-6amino) acrylates (III). The cyclization of III in refluxing dowtherm resulted in the formation of 3-methoxy-9-substituted pyrido(3,2-f)quinoxalin-10(7H)-ones (IV). The fluorescent properties of III and IV were studied. When applied on polyester fibres these compounds resulted in poor to moderate whitening effects. Page(s): 51-53

Rot- and mildew-proofing of jute fabric with quaternary ammonium compounds

2016-07-20T05:23:30Z

Title: Rot- and mildew-proofing of jute fabric with quaternary ammonium compounds Authors: Majumdar, S; Chatterjee, S; Dey, S; Ghosh, B L Abstract: Benzalkonium chloride (BKC)and cetyltrimethylammonium bromide (CTAB), the two bactericidal cationic surfactants of the quaternary ammonium group, have been found to impart high rot and mildew resistance to bleached jute without affecting its aesthetic appeal. Unlike cotton, BKC- or CTAB-treated jute retains considerable microbial resistance on leaching. This difference with cotton is due to the higher absorption capacity of jute which is further enhanced on bleaching. Page(s): 48-50

Electrically conducting natural fibres

2016-07-20T05:20:54Z

Title: Electrically conducting natural fibres Authors: Bhadani, S N; Gupta, S K Sen; Gupta, M K Abstract: A study on the electrochemical grafting of polypyrrole and polythiophene onto cotton, silk and wool fibres has been made. These fibres become moderately conducting after their electrical treatment in the polymerizing solution of pyrrole/thiophene in 1,2-dichloroethane containing tetrabutylammonium hexachloroantimonate as supporting electrolyte. Page(s): 46-47