Characterization and radiometric studies on poly(methyl methacrylate) doped with some amine derivatives

Abstract

6SAYYAH, SABBAH and SAID: Characterization and radiometric studies on poly(methy1 methacrylate) chain a n d t h e adjacent molecules of either solvent or polymer (in a melt). In such a case, t h e above formulation would apply with t h e variation of pressure replacing ST in eqs. (13) a n d (14) a n d t h e variation of volume replacing SU. T h e complex bulk modulus of t h e same form as in eq. (15) will result, but in this case it will have a n isothermal contribution, possibly exceeding t h e thermal one. T h e latter can be verified experimentally, since it is t h e isothermal longitudinal modulus that governs t h e fluctuations observed b y correlation spectroscopy methods in t h e light scattering experiments. Furthermore n o correlation with C&, values is t o be expected for t h e structural mechanism, if t h e volume changes are more important than those of t h e enthalpy. This picture which involves structural rearrangements does n o t conform t o t h e model of a chain interacting with its surroundings as a macroscopic object does with a viscous medium. It is quite possible t h a t t h e latter model, in spite of its great success in explaining t h e general features of viscoelastic behaviour, will have t o be exchanged for t h e more detailed molecular picture when more subtle properties are considered. T h e above considerations seem t o show t h a t this can b e done without losing t h e benefits of t h e continuous-medium approach, while at t h e same time leaving room for t h e concepts underlying t h e theories of transition t o t h e glass-like behaviour. The desirability of such incorporation has already been mentioned [I, 11, 161.Some p-phenylene diamine condensation products with different organic acids were synthesized. The effect of y-irradiation on PMMA films doped with three samples of these amines was investigated by ultraviolet spectroscopy. A change in the intensity of absorption bands with increasing irradiation dose was recorded. The use of PMMA films doped with this type of amines as dosimeter is suggested. Charakterisierung und radiometrische Untersuchung von mit Aminderivaten dotiertem PoZy(methyZmethacry2at)Einige Kondensationsprodukte von p-Phenylendiaminen mit verschiedenen organischen Sauren wurden synthetisiert. Der EinfluB von y-Bestrahlung auf PMMA-Filme, die mit drei Proben dieser Amine dotiert wurden, wird mittels UV-Spektroskopie untersucht. Es wurde eine Zunahme der Intensitat der Absorptionsbanden mit steigender Bestrahlungsdosis registriert. Die Verwendung der dotierten PMMA-Filme in der Dosimetrie wird vorgeschlagen. Xapakmepucmuxa u paauoMempuueckue uccfieaosanus noJcumemuJcmemaxpuJcama, ~omuposannozo npouesoanbwu m u n aCHHTeTH3E1pOBaHbI HeKOTOpbIe IIpORYKTbI KOHJ(eHCa~HE1 n-@?HHJIeH~E1aM%iHOB C pa3JIHqHbIMM OpraHHYeCKUMM KMCJIO-TPMII. c I I O M O 4 b H ) Y@-CneKTpOCKOIIHE1 IlCCJIeROBaJIOCb BJIHFIHIle y-JIyqe8 H a IIJIeHKIl E 1 3 nMMA, ROTHPOBaHHbIe TPeMFI Ha aTMX aMIlHOU. HaBn~o~anocb YUeJIllqeHHe IlHTeHCHBHOCTIl a6cop6qm C POCTOM R03bI 06JIyYeHHX. ripen-JIaraeTCx ...

Molecular weight studies of the γ‐irradiation degradation of poly(methyl methacrylate) doped with poly(p‐sulfanilamide)

“…The UV spectra of a pure PMMA film before and after g irradiation with different accumulated exposure doses (5,15,25,35,50,75, and 100 kGy) was investigated by Sayyah et al 35 They found that the absorbance increased with increasing g ray doses, and the linear part of the relationship between the absorbance and g-exposure dose lay between 0 and 50 kGy. This means that a pure PMMA film can be used as a dosimeter in this range of exposure doses.…”

“…The radiation doses (5,15,25,35,50,75, and 100 kGy) were measured with a radio chromic dye film and Perspex. The overall error in the dose measurements did not exceed 64%.…”

“…The UV spectra of PMMA films doped with poly(p-sulfanilamide) before and after irradiation with different accumulated c doses (5,15,25,35,50,75, and 100 kGy) were measured after the extraction of the dopant (Fig. 7).…”

“…Pure PMMA (without additives) and PMMA-poly(p-sulfanilamide) blend samples were irradiated with c rays for different exposure doses (5,15,25,35, 50, 75, and 100 kGy). The viscosity-average molecular weights were determined and thin-layer chromatography measurements were carried out after each irradiation dose.…”

Molecular Weight Studies on the Gamma Irradiation Degradation of Poly(methylmethacrylate) in the Absence and Presence of Sulfanilamide Derivatives, Part I: Tetraoxalylsulfanilamide and Its Cobalt (Ii) Complex

“…Optical and some structural changes were also investigated for PMMA polymer samples [10]. The effect of gamma irradiation on the electrical properties and dosimetric studies have also been studied on some acrylate polymers by Sayyah et al [11][12][13][14]. The amount of quantitative data available in this field is as yet limited.…”