NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Journal of Scientific and Industrial Research (JSIR) >
JSIR Vol.66 [2007] >
JSIR Vol.66(05) [May 2007] >


Title: Synthesis and physico-chemical study of polyester polyol of epoxy resin of 1, 1’-bis (3-methyl-4-hydroxy phenyl) cyclohexane and ricinoleic acid and its polyurethanes with polyethylene glycol
Authors: Mavani, S I
Mehta, N M
Parsania, P H
Keywords: Cardo polyester polyol
Chemical resistance
Copolyurethane
Density
Electrical properties
Mechanical
Thermal analysis
Issue Date: May-2007
Publisher: CSIR
Abstract: Cardo polyester polyol (acid value, 2.14; hydroxyl value, 911 mg KOH/g) has been synthesized by reacting epoxy resin of 1,1’-bis (3-methyl-4-hydroxy phenyl) cyclohexane (EE = 436) and ricinoleic acid (8.94 g) by using triethyl amine (0.5 g) as a catalyst and 1,4-dioxane as a solvent at reflux temperature for 6h. Cardo polyester polyol-TDI based copolyurethanes have been synthesized by reacting polyol (3.0 g) and TDI (0.9 g) in MEK at room temperature by using 20% and 30% PEG- 400 on the basis of polyol weight. PU-20 and PU-30 films were cast by controlled evaporation of MEK. The formation of polyol and copolyurethanes are supported by FTIR spectral data. Densities of PU-20 (1.2379 g/cm³) and PU-30 (1.2016 g/ cm³) are determined by floatation method at room temperature by using CCl₄₋ n- hexane system. Density decreased with PEG-400 concentration due to increase in intrinsic volume of the repeating unit. Tensile strength, electric strength and volume resistivity of both co polyurethanes decreased with increasing concentration of PEG-400 due to presence of soft and hard segments in polymer chain. PU-20 and PU-30 remained unaffected in pure water and 10% NaCl solution and showed moisture uptake tendency in acidic and alkaline atmosphere. Max. moisture uptake, observed within 24-48h, is 4.7-15% in 10% each of HCl, H₂SO₄ and HNO₃ and 8.7-14.2 % in 10% each of NaOH and KOH solutions. PU-30 has much low water absorption tendency as compared to PU-20 due to increasing PEG-400 concentration. PU-20 and PU-30 are thermally stable up to about 190-198°C and involved three-step degradation kinetics. No effect of PFG-400 was observed on thermal properties of co polyurethanes. For PU-20, T₀, T₁₀ and T₅₀ are 190, 225.1 and 362.6°C, while for PU-30 they are 198, 235.5 and 369.0°C, respectively. The decomposition ranges are 190-304, 342-440,472-540 and 198-307, 350-430, and 448-5900C, respectively for PU-20 and PU-30. The excellent hydrolytic stability and fairly good thermo-mechanical and electrical properties of PU-20 and PU-30 signify their industrial importance as coating and adhesive materials.
Page(s): 377-384
ISSN: 0022-4456
Source:JSIR Vol.66(05) [May 2007]

Files in This Item:

File Description SizeFormat
JSIR 66(5) (2007) 377-384.pdf195.48 kBAdobe PDFView/Open
 Current Page Visits: 844 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 576000 since 06-Feb-2009  Last updated on 26-Aug-2014Webmaster: nopr@niscair.res.in