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| From | Sergio <invalid@invalid.com> |
|---|---|
| Newsgroups | sci.physics |
| Subject | Re: Real Physics Question |
| Date | 2018-11-29 12:59 -0600 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <ptpctv$12db$1@gioia.aioe.org> (permalink) |
| References | <ptp4g0$ic6$1@gioia.aioe.org> |
On 11/29/2018 10:35 AM, Sergio wrote: > I have some plastic scintillation material, EJ 200 perhaps, > can I reshape it by softening it in water? (to keep it from air) > > I think it flows about 140 degrees F ?? not sure > > polyvinyltoluene > In the scintillator, glass transition determined from the heat ing curve, occurs in temperature 354 K while in pure polyvinyltoluene in 364 K. T g values determined using DSC are more similar to each other than results obtained from PALS analysis. Generally it is assumed that the softening point of amorphous polymers is 20 K below the glass transition point [103] . Therefore,softening temperature of J-PET scinillator is at 334 K (61 ºC). The value of softening point of commercial scintillators produced by Saint Gobain, which are also based on polyvinyltoluene is 343 K (70 ºC) [12] . Discrepancy between both values is relatively large, but the method of determination of softening point used by Saint Gobain is not given, so they cannot be compared with the high precision. Softening point can be interpreted as the maximal temperature in which scintillator can be used. However , PALSanalysis indicates that changes in the J-PET scintillator structure start to occur in much lower temperature region includingalso room temperature in which scintillators are being used. ********* => SO softens about 160 F (-ish) <= Glass is a very good and cheap material for the forms to bulk polymerization of polystyrene and polyvinyltoluene because polymer does not adhere to the surface of form. ********** => SO, I can use my fish tank! <=
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Real Physics Question Sergio <invalid@invalid.com> - 2018-11-29 10:35 -0600
Re: Real Physics Question Sergio <invalid@invalid.com> - 2018-11-29 12:59 -0600
Re: Real Physics Question Odd Bodkin <bodkinodd@gmail.com> - 2018-11-29 19:51 +0000
Re: Real Physics Question benj <benj.fake@gmail.com> - 2018-11-29 16:58 -0500
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