NDLI: Measurement of Effective Chemical Shrinkage of Polymeric Materials Using Fiber Bragg Grating Sensor

Content Provider	IEEE Xplore Digital Library
Author	Yong Wang Bongtae Han
Copyright Year	2002
Description	Author affiliation: Dept. of Mech. Eng., Maryland Univ., Baltimore, MD (Yong Wang; Bongtae Han)
Abstract	Summary form only given. Mechanical and thermal characterization of polymeric materials is critical to "predictive modeling" required for reliability assessment and design optimization at the conceptual stage of a new product development. One of the most critical polymer properties required for predictive stress modeling is "chemical shrinkage" developed during the polymerization process. Residual stresses induced by the chemical shrinkage can largely influence the performance and reliability of package. The issue of "chemical shrinkage" is not new. Numerous testing methods have been developed for many decades and some of them are practiced routinely to measure the intrinsic (or total) chemical shrinkage of polymers. It is important to note, however, that not all of the intrinsic chemical shrinkage contributes to the residual stresses simply because some of chemical shrinkage occurs before polymer builds up any mechanical strength. This study proposes an innovative integrated measurement method to measure the effective chemical shrinkage that contributes to the residual stresses. The method is based on a fiber Bragg grating (FBG) sensor. A polymer of interest is cured around a glass FBG and the Bragg wavelength shift is measured and documented while polymerization progresses at the curing temperature. The method is simple but measures the effective shrinkage accurately regardless of the modulus and coefficient of thermal expansion of the polymer
Starting Page	44
Ending Page	44
File Size	548360
Page Count	1
File Format	PDF
ISBN	1424402603
ISSN	15505723
DOI	10.1109/ISAPM.2006.1665993
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chemical sensors Polymers Residual stresses Wavelength measurement Mechanical sensors Predictive models Stress measurement Fiber gratings Bragg gratings Sensor phenomena and characterization
Content Type	Text
Resource Type	Article

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