Browse Prior Art Database

Optically Determining Thermal Characteristics of Thin Polymer Films

IP.com Disclosure Number: IPCOM000049590D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Drollinger, B: AUTHOR [+3]

Abstract

Glass transition temperature, curing temperature and other thermal characteristics of thin polymer films approximately 0.5 Mum are determined by plotting the normalized optical thickness versus the temperature.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 99% of the total text.

Page 1 of 2

Optically Determining Thermal Characteristics of Thin Polymer Films

Glass transition temperature, curing temperature and other thermal characteristics of thin polymer films approximately 0.5 Mum are determined by plotting the normalized optical thickness versus the temperature.

The sample is interferometrically measured in an oven in an air or a gas atmosphere. Illumination and light pick-up from the sample in the oven are effected by fiber optics. The optical thickness (mechanical thickness x index of refraction) is measured as a function of time for each temperature step: It has been found that the optical thickness decreases exponentially. The figure shows the optical thickness readings for each temperature step after a constant time, e.g., thirty minutes. From this plot, a sharp bend, corresponding to the glass transition temperature T(g), is clearly discernible as well as two straight lines I and II differing in their slope and indicating softening/curing and oxidation/degradation of the film, respectively. The activation energies for I and II can be calculated from the exponential decrease of the optical thickness versus time at constant temperatures.

The number of parameters to be measured can be increased by subjecting the sample to a dynamic load applied by an electrically driven quartz which is placed on the samples. Thus, the Young's modulus and the mechanical damping of the film can be determined.

1

Page 2 of 2

2

[This page contains 1 picture or other...