Browse Prior Art Database

Method to Monitor the Degree of Cure in Thermoset Polymer/Glass Cloth Composite

IP.com Disclosure Number: IPCOM000101969D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 47K

Publishing Venue

IBM

Related People

Gotro, JT: AUTHOR [+2]

Abstract

Disclosed is a nondestructive and fast method to measure the flow number for a glass cloth/thermosetting polymer composite. The method entails the use of tunable diode lasers that are used to measure the conversion, and using an established calibration curve, the flow number is determined.

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Method to Monitor the Degree of Cure in Thermoset Polymer/Glass Cloth Composite

       Disclosed is a nondestructive and fast method to measure
the flow number for a glass cloth/thermosetting polymer composite.
The method entails the use of tunable diode lasers that are used to
measure the conversion, and using an established calibration curve,
the flow number is determined.

      The apparatus to measure the flow number consists of an optics
table with two tunable diode lasers, two monochrometers, a reference
and sample detector, a sample holder to spin the polymer/glass cloth
composite, and an IBM PC-AT* for data analysis and instrument
control.  The instrument control and data analysis software was
written by IBM personnel.

      The apparatus passes a laser beam tuned to a specific frequency
through an epoxy resin/glass cloth composite (herein referred to as
prepreg).  By tuning the laser to the appropriate frequency, the
chemical reaction of the epoxy can be monitored.  A second laser is
tuned to a second frequency and monitors a band that does not change
with curing.  This serves as an internal reference.

      The diode lasers are capable of operation over a wide frequency
range.  In the case of epoxy resin/glass cloth composites, the epoxy
resin has a strong infrared absorbance at 915 cm-1, and a reference
peak (that does not change with curing) at 1698-cm.  The diode laser
is precisely tuned to detect only the specific absorbance, thus
mak...