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20151104125429.0 |
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cr unu-------- |
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070123s2006 txu sbm 000 0 eng d |
| 035 |
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|a (OCoLC)ocm79624297
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| 035 |
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|a (TxCM)http://handle.tamu.edu/1969.1/3075
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|a TXA
|c TXA
|d UtOrBLW
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| 049 |
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|a TXAM
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| 099 |
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|a 2004
|a Dissertation
|a L5295
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| 100 |
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|a Li, Yuntao,
|d 1975-
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| 245 |
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|a Synthesis and cure characterization of high temperature polymers for aerospace applications /
|c by Yuntao Li.
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| 264 |
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|a [College Station, Tex.] :
|b [Texas A&M University],
|c [2006]
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| 336 |
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|a text
|b txt
|2 rdacontent
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|a computer
|b c
|2 rdamedia
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|a online resource
|b cr
|2 rdacarrier
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| 500 |
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|a "Major Subject: Materials Science and Engineering"
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| 500 |
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|a Title from author supplied metadata (automated record created on Apr. 14, 2006.)
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| 500 |
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|a Vita.
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| 500 |
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|a Abstract.
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| 502 |
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|b Ph. D.
|c Texas A&M University
|d 2004.
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|a Includes bibliographical references.
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|a Text (Dissertation).
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|a The E-beam curable BMI resin systems and phenylethynyl terminated AFR-PEPA-4 oligomer together with an imide model compound N-phenyl-[4-(phenylethynyl) phthalimide] were synthesized and characterized. E-beam exposure cannot propagate the polymerization of BMI system until the temperature goes up to 100° C. However, a small amount of oligomers may be generated from solid-state cure reaction under low E-beam intensity radiation. Higher intensity E-beam at 40 kGy per pass can give above 75% reaction conversion of BMI with thermal cure mechanism involved. NVP is a good reactive diluent for BMI resin. The cure extents of BMI/NVP increase with the increase of the dosage and applied dosage per pass. The reaction rate is much higher at the beginning of the E-beam cure and slows down after 2 dose passes due to diffusion control. Free radical initiator dicumyl peroxide can accelerate the reaction rate at the beginning of E-beam cure reaction but doesn't affect final cure conversion very much. According to the results from FT-IR, 200 kGy total dosage E-beam exposure at 10 kGy per pass can give 70% reaction conversion of BMI/NVP with the temperature rise no more than 50° C. The product has a Tg of 180° C. The predicted ultimate Tg of cured AFR-PEPA-4 polyimide is found to be 437.2° C by simulation of DSC Tg as a function of cure. The activation energy of thermal cure reaction of AFR-PEPA-4 oligomer is 142.6 ± 10.0 kJ/mol with the kinetic order of 1 when the reaction conversion is less than 80%. The kinetics analysis of the thermal cure of N-phenyl-[4-(phenylethynyl) phthalimide] was determined by FT-IR spectroscopy by following the absorbance of the phenylethynyl triple bond and conjugated bonds. The thermal crosslinking of N-phenyl-[4-(phenylethynyl) phthalimide] through phenylethynyl addition reaction has a reaction order of 0.95 and an activation energy of 173.5 ± 8.2 kJ/mol. The conjugated bond addition reactions have a lower reaction order of 0.94 and lower activation energy (102.7 ±15.9 kJ/mol). The cure reaction of N-phenyl-[4-(phenylethynyl) phthalimide] can be described as a fast first-order reaction stage followed by a slow second stage that is kinetically controlled by diffusion.
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| 538 |
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|a Mode of access: World Wide Web.
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| 538 |
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|a System requirements: World Wide Web access and Adobe Acrobat Reader.
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| 500 |
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|a Electronic resource.
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4 |
|a Major Materials Science and Engineering.
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| 653 |
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|a Bismaleimide
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| 653 |
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|a Curing
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| 653 |
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|a Electron beam
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|a Polyimide
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| 700 |
1 |
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|a Sue, Hung-Jue,
|e thesis advisor.
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|a Morgan, Roger J.,
|e thesis advisor.
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| 856 |
4 |
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|u http://hdl.handle.net/1969.1/3075
|z Link to OAK Trust copy
|t 0
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| 948 |
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|a cataloged
|b h
|c 2007/1/23
|d c
|e bwalker
|f 10:19:57 am
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| 994 |
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|a C0
|b TXA
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| 999 |
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|a MARS
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| 999 |
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|s d80ddd5b-c2a2-3850-8118-5b785a719647
|i 97f876d7-5953-393e-ba82-d5c28fd58e45
|t 0
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| 952 |
f |
f |
|a Texas A&M University
|b College Station
|c Electronic Resources
|s www_evans
|d Available Online
|t 0
|e 2004 Dissertation L5295
|g Electronic
|h Other scheme
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| 998 |
f |
f |
|a 2004 Dissertation L5295
|t 0
|l Available Online
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