Synthesis of and physico-chemical studies on poly(4,4′-cyclopentylidene diphenylene toluene-2,4-disulfonate)

✍ Scribed by K.M. Rajkotia; M.M. Kamani; P.H. Parsania

• Book ID: 104164393
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 419 KB
• Volume: 38
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00554-x

✦ Synopsis

Poly(4,4~-cyclopentylidene diphenylene toluene-2,4-disulfonate) (PSBPT) has been synthesized by conventional interfacial polycondensation of 1, l'-bis(4-hydroxyphenyl) cyclopentane (0.005 mol) and toluene-2,4disulfonyl chloride (0.005 tool) using water (50 ml)-chloroform (12.5 ml) as interphase, alkali (0.015 mol) as acid acceptor and cetyltrimethyl ammonium bromide (0.125 g) as emulsifier. The structure of PSBPT has been supported by infra-red and nuclear magnetic resonance spectral data. A 40#m thick film has 200.1 kg cm -z tensile strength and 0.6% elongation at break. A 0.19 mm thick film has static hardness 14.5-2 3 16.5kgmm-at different loads (15-60g). The density (1.353+0.0009gcm-) of PSBPT has been determined by the floatation method and compared with calculated values (1.3973 g cm-3). Thermogravimetric (t.g.a.) and differential thermal (d.t.a.) measurements have been made at four different heating rates o 1

and 10 C rain-, respectively in N2 atmosphere. D.t.a. showed the glass transition temperature Tg at about 134°C and two exotherms at 337°C and 362°C which might be due to decomposition. PSBPT is stable up to about 355°C in N2 atmosphere and involves two-step degradation. The average energy of activation, pyrolysis order and frequency factor for step-I are 52.6 kcal mo1-1, 2.5 and 9.22 × 1013 rain -I, respectively. PSBPT has excellent hydrolytic stability towards acids and alkalis.