A MALDI, TGA, TG/MS, and DEA study of the irradiation effects on PMMA

Tatro, Shelli R.; Baker, Gregory R.; Bisht, Kirpal S.; Harmon, Julie P.

doi:10.1016/s0032-3861(02)00727-9

Cited by 34 publications

(11 citation statements)

References 52 publications

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“…The least thermally stable was C0.1T14, which is related to hydrolyzing effect of cellulase on polymers. The lower thermal stability is caused by decreasing of molecular weight [26]. Despite the fact that the maximum cellulase activity used in our study is displayed at temperature of 40 ∘ C to 57 ∘ C and pH of 4.2 to 6.5, we can assume that hydrolytic effect is also possible at 24 ∘ C and pH of 4.0-4.5 during structuring process.…”

Section: Resultsmentioning

confidence: 65%

Modification Effect of Cellulase on the Physicochemical Characteristic of Polysaccharides Edible Films

Zimoch-Korzycka

Ambrozik-Haba

Kulig

et al. 2015

International Journal of Polymer Science

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This study was conducted to assess hydrolytic influence of cellulase (C) on the physicochemical stability of chitosan (CH)/hydroxypropyl methylcellulose (HPMC) films in time of storage (T). Initially, nine films were physically characterized by contact angle, water vapour permeability (WVP), water activity(aw), tensile test, dynamic mechanical thermal analysis (DMTA), and thermogravimetric analysis (TGA) and chemically by Fourier Transform Infrared Spectrometry (FTIR). The contact angle results varied from 53.67° to 78.33°. The presence of the enzyme and passing time reduced the WVP from8.46E-09to7.41E-09 g/s·m·Pa. The enzyme treatment improved elasticity but decreased tensile strength of films. After adding cellulaseTgwas shifted to a higher temperature. Thermal stability of the films decreased with addition of cellulase and after prolonging storage time. FTIR analysis proved that chemical changes in polysaccharides structure were caused by cellulase incorporation in films composition, which may be observed in appearance of 1656 cm−1band. Theawvalues did not change.

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Section: Resultsmentioning

confidence: 65%

Modification Effect of Cellulase on the Physicochemical Characteristic of Polysaccharides Edible Films

Zimoch-Korzycka

Ambrozik-Haba

Kulig

et al. 2015

International Journal of Polymer Science

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“…The G-value of acid generation is 1.4 without any acid generators. 124) Although the counteranion has not been identified, it is possibly a formic 198) or acetic 196) anion. The main chain scission of PMMA is also induced by UV light.…”

Section: Methacrylate Polymermentioning

confidence: 99%

Radiation Chemistry in Chemically Amplified Resists

Kozawa

Tagawa

2010

Jpn. J. Appl. Phys.

336

319

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Historically, in the mass production of semiconductor devices, exposure tools have been repeatedly replaced with those with a shorter wavelength to meet the resolution requirements projected in the International Technology Roadmap for Semiconductors issued by the Semiconductor Industry Association. After ArF immersion lithography, extreme ultraviolet (EUV; 92.5 eV) radiation is expected to be used as an exposure tool for the mass production at or below the 22 nm technology node. If realized, 92.5 eV EUV will be the first ionizing radiation used for the mass production of semiconductor devices. In EUV lithography, chemically amplified resists, which have been the standard resists for mass production since the use of KrF lithography, will be used to meet the sensitivity requirement. Above the ionization energy of resist materials, the fundamental science of imaging, however, changes from photochemistry to radiation chemistry. In this paper, we review the radiation chemistry of materials related to chemically amplified resists. The imaging mechanisms from energy deposition to proton migration in resist materials are discussed.

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“…Xie (2011) observed that complex enzymes composed of commercial cellulose, pectinase and α-amylase degrade the large molecular chain of chitosan, and as a consequence, molecular weight lowered from 1,000,000 to 100,000. According to Tatro et al (2003), lower thermal stability is caused by decreasing of molecular weight. The same result is observed in this study.…”

Section: Antibacterial Activitymentioning

confidence: 99%

Antibacterial Activity and Physical Properties of Edible Chitosan Films Exposed to Low-pressure Plasma

Ulbin-Figlewicz

Zimoch-Korzycka

Jarmoluk

2014

Food Bioprocess Technol

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The challenge for food industry is developing gentle processes concept, which will prevent food spoilage and leave a food natural, minimally processed, fresh-like and safe. A new technique of food preservation could be usage of combined methods of green process, such as cold gas plasma with bioactive substances, and protective coatings. The aim of this study was to determine the antibacterial activity of chitosan films incorporated with lysozyme exposed to helium plasma treatment as well as evaluate their physical properties. The edible films have been prepared basing on low molecular weight chitosan by casting from lactic acid solution with water solution of lysozyme in three various concentrations (0, 0.5 and 1 %). Dried films were then modified by exposition on cold helium plasma treatment for 0, 5 and 10 min. Obtained films were tested against growth of Listeria monocytogenes, Yersinia enterocolitica and Pseudomonas fluorescens. In order to characterize chitosan-based films, their mechanical properties, theromogravimetric analysis (TGA), dynamic mechanical thermal analysis (DMTA), contact angle measurement, water vapour permeability (WVP) and scanning electron microscopy (SEM) were evaluated. The films with 1 % lysozyme incorporation enhanced the inhibition efficiency of chitosanbased films against gram-positive (L. monocytogenes) and gram-negative (P. fluorescens) bacteria, where reduction zones were 42.5 and 69.8 mm, respectively. Besides that, hydrolytic changes of chitosan chain caused by lysozyme activity were confirmed by TGA and DMTA. Contact angles and WVP of tested films were not significantly affected by helium plasma exposition, nor lysozyme dosage. Hydrophilic natures of chitosan-based films were confirmed by both tests.Microscopy image of cross-section structure was smooth and continuous due to lysozyme addition in film composition. Application of chitosan films incorporated with lysozyme and low-pressure plasma treatment could be used as innovative preservation method in a wide range of food products.

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A MALDI, TGA, TG/MS, and DEA study of the irradiation effects on PMMA

Cited by 34 publications

References 52 publications

Modification Effect of Cellulase on the Physicochemical Characteristic of Polysaccharides Edible Films

Modification Effect of Cellulase on the Physicochemical Characteristic of Polysaccharides Edible Films

Radiation Chemistry in Chemically Amplified Resists

Antibacterial Activity and Physical Properties of Edible Chitosan Films Exposed to Low-pressure Plasma

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