Results 141 to 150 of about 474 (165)
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New synthesis of benzotriazole photostabilizers
Australian Journal of Chemistry, 19811-(2-Nitrophenyl)-5-aryltetrazoles and 1-aryl-5(2nitropheny1)tetrazoles are converted into 2-arylbenzotriazoles by the action of heat, the former reacting much faster than the latter. By appropriate use of methoxyl groups, useful benzotriazole ultraviolet absorbers may be synthesized conveniently by this method.
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Photostabilization of biocontrol agents by berberine
International Journal of Pest Management, 2001We studied the photostabilizing effect of the isoquinoline alkaloid berberine on the following three model photounstable biocontrol agents: the bacterium Bacillus thuringiensis ( Bt ), the baculovirus Spodoptera littoralis nucleopolyhedrosis virus ( SlNPV ), and the entomopathogenic fungus Beauveria bassiana .
E. Cohen, T. Joseph, M. Wassermann-Golan
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Maleic diamides as photostabilizers for polystyrene
Journal of Industrial and Engineering Chemistry, 2013Abstract Some condensation maleic diamide adducts were prepared, characterized, and evaluated as photostabilizers for polystyrene. The potency of these diamides was determined by measuring the extent of weight loss (%), formed gel as well as the average molecular weights M ¯ V of the soluble fractions of the degraded polymers.
Samira T. Rabie +3 more
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Fibers and Polymers, 2020
Three kinds of tree bark extractives from trembling aspen (Populus tremuloides) (AE), lodgepole pine (Pinus contorta) (LE), and western red cedar (Thuja plicata) (RE) were produced and used as antioxidants. The antioxidation activities of those extractives were evaluated and compared with commercial antioxidant butylated hydroxytoluene (BHT).
Yao Peng, Ning Yan, Jinzhen Cao
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Three kinds of tree bark extractives from trembling aspen (Populus tremuloides) (AE), lodgepole pine (Pinus contorta) (LE), and western red cedar (Thuja plicata) (RE) were produced and used as antioxidants. The antioxidation activities of those extractives were evaluated and compared with commercial antioxidant butylated hydroxytoluene (BHT).
Yao Peng, Ning Yan, Jinzhen Cao
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How to photostabilize molsidomine tablets.
Journal of pharmaceutical sciences, 2005Different methods of photostabilization are presented for the very light sensitive molsidomine tablets. The incorporation of photostabilizers such as light absorber or pigments into the tablets considerably improved the photostability. Nevertheless, photodegradation was still detected after 12 h of intense light stress.
W, Aman, K, Thoma
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PHOTOSTABILIZATION OF MACROMOLECULES BY EXCITED STATE QUENCHING
Pure and Applied Chemistry, 1978One approach to imparting long-term outdoor stability to polymeric systems is to add to them small amounts of compounds which will quench the electronic excitation energy associated with specific chromophores as a result of photon absorption. Carbonyl groups, hydroperoxides and singlet molecular oxygen (or its precursors) are chromophores commonly ...
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Photostabilization Studies Of Silver/Polymethylmethacrylate Films
SPIE Proceedings, 1987Degradation of the optical performance by ultraviolet (UV) light is currently one of the principal barriers in the development of silver/polymer films for solar thermal applications. We have conclusively shown that stabilizers added to polymer films do improve the weatherability of mirrors, and we have identified a series of representative examples ...
H. H. Neidlinger, P. Schissel
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New developments in polymer photostabilization
Polymer Degradation and Stability, 1995The current status of polymer photostabilization is reviewed with respect to the progress in photostabilizing formulations, optimum molecular weight (MW) for UV stabilizers and their structural improvements, extended uses. Recent new trends in plastics for automobiles (higher temperature processing, the use of easily recyclable plastics and upgrading ...
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Photostabilizing activity of tertiary hindered amines
Journal of Polymer Science: Polymer Chemistry Edition, 1985AbstractThe influence of the N‐alkyl group of tertiary hindered amines on the photostabilization of polymers was studied. The photostabilizing effects of the tertiary amine derivatives of 4‐benzoyloxy‐2,2,6,6‐tetramethylpiperidine (1a) in polypropylene were compared.
Tomoyuki Kurumada +5 more
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Photostability Issues in Pharmaceutical Dosage Forms and Photostabilization
AAPS PharmSciTech, 2017Photodegradation is one of the major pathways of the degradation of drugs. Some therapeutic agents and excipients are highly sensitive to light and undergo significant degradation, challenging the quality and the stability of the final product. The adequate knowledge of photodegradation mechanisms and kinetics of photosensitive therapeutic entities or ...
Karthik Yadav, Janga +8 more
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