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Abstract  

Physical aging of polyetherimide (PEI) was studied using a bellows dilatometer based on Zoller's design. A linear variable differential transformer (LVDT) is used to measure the displacement of the bellows. The voltage output of the LVDT is interfaced to a computer for automated data collection. Isothermal aging experiments were carried out at temperatures near the glass temperature (206–209 ‡C) using a constant temperature oil bath maintained at the desired aging temperature. The time required to reach equilibrium and the reduced curve produced by aging time-temperature superposition are given. The results compare well with data obtained by capillary dilatometry for the same material.

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Abstract  

A radiotracer based method for the determination of the rate of expel of a swelling agent from a swelling agent saturated polymer foil induced by a second organic liquid (i.e., blowing agent for foaming of polymers) has been set up and tested. The method was applied to acetone swollen polyetherimide (PEI) foil and 1,1,1-trichloroethane and ethanol (blowing agents) systems. By combining the results of radiotracer measurements with those obtained by measuring foil weights, the amount of the respective blowing agents that replaced acetone in the PEI foil was determined.

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Journal of Thermal Analysis and Calorimetry
Authors: P. Rajagopalan, L. Kandpal, A. Tewary, R. Singh, K. Pandey, and G. Mathur

Abstract  

PEEK is characterised by high impact and fatigue resistance andT g of 145‡C. Blends of PEEK and PEI have been made and scanning electron micro-graphs of the broken specimen show that the two polymers are completely miscible in all proportions. The study also shows that PEEK∶PEI 50∶50 blend, can be used as matrix for composite applications with appreciable enhancement ofT g to 177‡C.

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.P. Singh K.N. Pandey G.N. Mathur 1997 Thermal behaviour of Polyetherimide PEEK blends

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. Jiao , Y. , Shi , H. , Tang , J. , Li , F. & Wang , S. ( 2015 ): Improvement of radio frequency (RF) heating uniformity on low moisture foods with polyetherimide (PEI) blocks . Food Res. Int. , 74 , 106 – 114

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. Polyetherimide-modified epoxy networks: influence of cure conditions on morphology and mechanical properties . J Appl Polym Sci . 1997 ; 65 : 2433 – 2445 . 10.1002/(SICI)1097-4628(19970919)65:12<2433::AID-APP15>3.0.CO;2

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Journal of Thermal Analysis and Calorimetry
Authors: Chinnaswamy Thangavel Vijayakumar, Rajendran Surender, Kumaraswamy Rajakumar, and Sarfaraz Alam

. Thangakameshwaran for their participation in this work. References 1. Zhao , L , Li , L , Tian , JX , Zhuang , J , Li , S . Synthesis and characterization of bismaleimide-polyetherimide

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. Harismendy , I , Rio , MD , Marieta , C , Gavalda , J , Gomez , CM , Mondragon , I 2001 Dicyanate ester–polyetherimide semi-interpenetrating polymer networks. II. Effects of morphology on the fracture toughness and mechanical properties . J Appl

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in double-walled digestion vessels which have an inner liner and cover made up of Teflon PFA and an outer strength vessel shell of Ultem polyetherimide. In a typical procedure, kanemite (2.2 g) was added into a beaker containing a mixture of CTMABr (0

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, Hamciuc , E , Bacosca , I , Olariu , M . Thermal and electrical properties of some poly(ether-imide) thin films . Mater Plast . 2010 ; 47 : 11 – 15 .

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