Poly gamma irradiation

Recent studies on LET effects In 2 mm thick samples of polymers have shown no difference between fast neutron and Co60 gamma irradiations for poly(olefIns) (32), a small difference for... [Pg.21]

An aromatic polysulfone based on 4,4 -biphenol and 4,4 -dichlorodiphenyl sulfone (Bp PSF) was shown to be the most resistant of a systggatic series of poly (arylene ether sulfones) to Co gamma irradiation. [Pg.252]

Shameem, M., Lee, H., Burton, K., Thanoo, B.C., and Deluca, P.P. (1999). Effect of gamma-irradiation on peptide-containing hydrophilic poly (d,l-lactide-co-glycolide) microspheres. PDA J. Pharmaceut. Sci. Tech., 53, 309-313. [Pg.306]

Hausberger, A. G., Kenley, R. A., and DeLuca, P. P. Gamma irradiation effects on molecular weight and in vitro degradation of poly(D,L-lactide-CO-glycolide) microparticles. Pharm. Res. 12(6) 851—856, 1995. [Pg.302]

Montanari, L., Costantini, M., et al. Gamma irradiation effects on poly(DL-lactictide-coglycolide) microspheres. J. Contr. Rel. 56(1—3) 219-229, 1998. [Pg.302]

Bittner, B., Mader, K., et al. Tetracycline-HCl-loaded poly(DL-lactide-co-glycolide) microspheres prepared by a spray drying technique influence of gamma-irradiation on radical formation and polymer degradation. J. Contr. Rel. 59(1) 23—32, 1999. [Pg.302]

Querner C, Schmidt T, Arndt KF (2004) Characterization of structural changes of poly(vinyl methyl ether) gamma-irradiated in diluted aqueous solutions. Langmuir 20(7) 2883-2889... [Pg.128]

Poly-D-lysine, lyophihzed and gamma-irradiated (Sigma)... [Pg.118]

Montanari L, Cilurzo F, Valvo L, et al. Gamma irradiation effects on stabibty of poly(lactide-co-glycolide) microspheres containing clonazepam. J Control Release 2001 75(3) 317-330. [Pg.417]

L. Liang and S. Ying, Charge-mosaic membrane from gamma-irradiated poly(styrene-butadiene-4-vinylpyridine) triblock copolymer, J. Polym. Sci., Polym. Phys., 1993, 31, 1075-1081. [Pg.81]

Nguyen and Kausch [1984] found that the presence of phenyl groups in poly(styrene-co-acrylo-nitrile), SAN, protects PMMA in the blend, during radiolysis (Table 11.9). SAN and PMMA were dissolved in dimethyl formamide, 50- J,m-thick films were cast, and then dried under vacuum. Transparent bar specimens were compression-molded from the film. Mixing the polymers by co-precipitation from methanol resulted in opaque samples. Gamma irradiations were done in evacuated and sealed glass tubes, at a dose rate of 3 kGy/h. Comparison of freshly irradiated samples with irradiated and annealed ones showed the absence of any post-irradiation effects. [Pg.838]

Urry DW, Parker TM, Reid MC, Gowda DC. Biocompatibility of the bioelastic materials, poly (GVGVP) and its gamma-irradiation cross-linked matrix - summary of generic biological test results. J Bioact Compatible Polym 1991 6 263-282. [Pg.454]

Figure 10 shows the O NMR spectra of poly(isoprene) gamma irradiated in the presence of O-enriched oxygen. The authors have identified classes of peaks through comparison with model compounds it is conceivable that in future a database of O chemical shifts will aid researchers in this area. The authors were able to show that irradiation of poly(isoprene) in oxygen results in the formation largely of alcohols and ethers from hydrogen abstraction and termination reactions, respectively, of alkoxy radicals. These radicals are products of homolysis of hydroperoxy radicals. [Pg.30]

Williams, D.E and Chu, C.C., 1984. The effects of enzymes and gamma irradiation on the tensile strength and morphology of poly(p-dioxanone) fibers. /. Appl. Polym. ScL, 29 1865-1877. [Pg.690]

Yang, Y. et al.. Covalent bonding of collagen on poly(L-lactic acid) by gamma irradiation, Nucl. Instrum. Meth. Phys. Res. Sect. B Beam Interact. Mater. Atoms, 207, 165, 2003. [Pg.977]

Gryte CC, Koroneos C, Agarwal A, Hochberg A (1980) Drag reduction characteristics of graft copolymers prepared by the gamma irradiation of poly (oxyethylene) in the presence of acrylic acid. Polym Eng Sci 20 478 84... [Pg.203]

Nozaki T, Masutani M, Akagawa T et al. Suppression of G1 arrest and enhancement of G2 arrest by inhibitors of poly(ADP-ribose) polymerase Possible involvement of poly(ADP-ribos )ation in cell cycle arrest following gamma-irradiation. Jpn J Cancer Res 1994 85(11) 1094-1098. [Pg.216]

Poly(vinyl alcohol), or PVAL, is the polymer that was used for this purpose. It is a neutral, partially water-soluble polymer (43,44) that is generally considered to be biocompatible and nontoxic (45-47). Its structure is shown in Figure 3B. PVAL has been used as a matrix for entrapment of several enzymes in gels formed by gamma irradiation of aqueous solutions of polymer/enzyme mixtures (45,48-50). In some of our experiments, allyl methacrylate (AM) was added to the polymer to facilitate cross-linking at lower doses. [Pg.91]

Tensile Mechanical Properties of poly(vinyl alcohol) (PVOH) and PAM Homopolymers and Their Blends at Equal Contents before and after Gamma Irradiation at a Dose of 100 kGy (Standard Deviations Are Omitted)... [Pg.269]

Source El-Din, H. M. N., El-Naggar, A. W. M., Ali, E I., Miscibility of poly(vinyl alcohol)/ polyacrylamide blends before and after gamma irradiation. Polymer International 2003, 52,225-234. With permission. [Pg.269]

Styrene butadiene rubber (SBR)/poly(ethylene-co-vinyl acetate (EVA) blends were compatibilized with SEBS-g-MA and further gamma irradiated to evaluate their aging resistance toward radiation. The resistance of the blends to gamma irradiation is better for those that contain higher proportions of EVA. ... [Pg.282]

El-Sahnawi, K., Abu Zeid, M. M., El-Naggar, A. M., Mamdouh, M., Stmcture-prop>erty behavior of gamma-irradiated poly(styrene) and poly(methyl methacrylate) miscible blends. Journal of Applied Polymer Science 1999, 72,509-520. [Pg.298]

GAMMA IRRADIATION OF POLY(PYRROLE)-COATED Pt ELECTRODES THE EFFECT ON THE ELECTROCHEMICAL BEHAVIOR... [Pg.435]

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