Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations.

Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations. Abstract Text:

Gejo,Narayanapillai Manoj,Sarojiniamma Sumalekshmy,Hartmut Glieman,Thomas Schimmel,Michael , Braun,

Vacuum-ultraviolet (VUV) irradiation (lambda(exc): 172 +/- 12 nm) of polystyrene films in the presence of oxygen produced not only oxidatively functionalized surfaces, but generated also morphological changes. Whereas OH- and C[double bond, length as m-dash]O-functionalized surfaces might be used for e.g. secondary functionalization, enhanced aggregation or printing, processes leading to morphological changes open new possibilities of microstructurization. Series of experiments made under different experimental conditions brought evidence of two different reaction pathways: introduction of OH- and C[double bond, length as m-dash]O-groups at the polystyrene pathways is mainly due to the reaction of reactive oxygen species (hydroxyl radicals, atomic oxygen, ozone) produced in the gas phase between the VUV-radiation source and the substrate. However, oxidative fragmentation leading to morphological changes, oxidation products of low molecular weight and eventually to mineralization of the organic substrate is initiated by electronic excitation of the polymer leading to C-C-bond homolysis and to a complex oxidation manifold after trapping of the C-centred radicals by molecular oxygen. The pathways of oxidative functionalization or fragmentation could be differentiated by FTIR-ATR analysis of irradiated polystyrene surfaces before and after washing with acetonitrile and microscopic fluorescence analysis of the surfaces secondarily functionalized with the N,N,N-tridodecyl-triaza-triangulenium (TATA) cation. Ozonization of the polystyrene leads to oxidative functionalization of the polymer surface but cannot initiate the fragmentation of the polymer backbone. Oxidative fragmentation is initiated by electronic excitation of the polymer (contact-mode AFM analysis), and evidence of the generation of intermediate C-centred radicals is given e.g. by experiments in the absence of oxygen leading to cross-linking (solubility effects, optical microscopy, friction-mode AFM) and disproportionation (fluorescence).

Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations. Publishing Authors By Initials

JL Gejo,N Manoj,S Sumalekshmy,H Glieman,T Schimmel,M ,AM Braun,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Photochemical & photobiological sciences : Officia

VOLUME: 5

Page Numbers: 948-54

Journal Abbreviation: Photochem. Photobiol. Sci.

ISSN: 1474-905X

DAY: 6

MONTH: 09

YEAR: 2006

Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101124451

Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations.

AFFILIATION: Lehrstuhl für Umweltmesstechnik, Universität Karlsruhe, D-76128, Karlsruhe, Germany. Andre.Braun@ciw.uni-karlsruhe.de.

Country: England

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Photochem Photobiol Sci

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations Related Publications

• 597.
• A "moving metal mechanism" for substrate cleavage by the DNA repair endonuclease APE-1.
• ASC: what does it measure and predict?
• Actomyosin-mediated statolith positioning and sedimentation in gravisensing plant cells studied in microgravity.
• Acute pancreatitis presenting as sudden, unexpected death: an autopsy-based study of 27 cases.
• Association between a variation in the phosphodiesterase 4D gene and bone mineral density.
• Bioinformatics approaches to classifying allergens and predicting cross-reactivity.
• Computerized digital dermoscopy.
• Confirmation of administrative claims-identified opportunistic infections and other serious potential adverse events associated with tumor necrosis factor alpha antagonists and disease-modifying antirheumatic drugs.
• Developmental regression and autism reported to the Vaccine Adverse Event Reporting System.
• Electronic Band Structure of Monolayer Bi on GaP(110).
• Estrus induction in the bitch using a combination diethylstilbestrol and FSH-P.
• Evolution of hemispheric specialisation of antagonistic systems of management of the body's energy resources.
• Family support for Native Hawaiian women with breast cancer.
• Impact of methodological factors on sperm penetration into cervical mucus in cattle.
• L?'au lapa'au and Western medicine in Hawai'i: experiences and perspectives of patients who use both.
• Mineralization of CCl(4) by the UVC-photolysis of hydrogen peroxide in the presence of methanol.
• Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si.
• Reducing cancer health disparities in the US-associated Pacific.
• Statistical analysis of physical-chemical properties and prediction of protein-protein interfaces.
• Supports for and barriers to healthy living for Native Hawaiian young adults enrolled in community colleges.
• The involvement of ipsilateral temporoparietal cortex in tactile pattern working memory as reflected in beta event-related desynchronization.
• The tetraspan protein EMP2 regulates expression of caveolin-1.
• The use of anesthesia during evoked potential audiometry in goldfish (Carassius auratus).
• Transcriptional profiling of androgen receptor (AR) mutants suggests instructive and permissive roles of AR signaling in germ cell development.
• Utilization of continuous glucose monitoring in normoglycemic, insulin resistant women: 604: may 30 4:45 PM 5:00 PM.
• VITO-1, a novel vestigial related protein is predominantly expressed in the skeletal muscle lineage.
• Vacuum-ultraviolet photochemically initiated modification of polystyrene surfaces: morphological changes and mechanistic investigations.
• [Botulinum toxin A injection for treatment-refractory giggle incontinence]
• [Stone management in children]