Novel Polyphosphonic Hydrazides as Potential Flame Retardent Additives for Polypropylenes

Pooja Srivastava and Mohd. G. H. Zaidi

Department of Chemistry, CBS and H, G. B. Pant University of Agriculture and Technology, Pantnagar - 263 145 India.

ABSTRACT:

Low temperature suspension polycondensation of phosphonic dihydrazide (PDH) with a series of aliphatic diacid chlorides: [CH2]n(COC1)2 n = 2,4,6 in dry N, N- Dimethylacetamide (DMAC) at -10°C afforded linear soluble & fusible polyphosphonic hydrazides (PPHs). Oxidative TG-DTA indicate their ranges for Mpt. 350-370°C corresponding to calculated Tg. 233.3-246.6°C. At first stage decomposition, their Ea and order of degradation evaluated were 1.69-2.58 Kcal mol-1 and 0.5-0.12 respectively. End group analysis indicate their Mn: 2.86-5.89 x 104. Inherent voscosities 0.24-0.47 dl gr-1 at 25 ± 0.1°C . All such PPHs have shown characteristics IR (KBr) frequencies in the range of vNH: 3300-3200cm-1 ,8 H-P = O; 800cm-1 and vP=0,1225cm-1. Various thermal, spectral and other analytical data evaluated indicate that the proposed PPHs are being associated with appreciable thermal and mechanical stabilities therefore, may be potentially required as a Heine retardant additives for polypropylenes.

KEYWORDS:

polycondensation; phosphonic; dihydrazide Dimethylacetamide

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Copy the following to cite this article: Srivastava P, Zaidi M. G. H. Novel Polyphosphonic Hydrazides as Potential Flame Retardent Additives for Polypropylenes. Orient J Chem 2000;16(2).

Copy the following to cite this URL: Srivastava P, Zaidi M. G. H. Novel Polyphosphonic Hydrazides as Potential Flame Retardent Additives for Polypropylenes. Orient J Chem 2000;16(2). Available from: http://www.orientjchem.org/?p=36397