A5028347974- Polymer crystallization and properties
- Polymer Nanocomposites and Properties
- biodegradable polymer synthesis and properties
- Advanced Neural Network Applications
- Polymer Science and PVC
- Synthesis and properties of polymers
- Robotics and Sensor-Based Localization
- Microfluidic and Capillary Electrophoresis Applications
- Silicone and Siloxane Chemistry
- Advanced Image and Video Retrieval Techniques
- Analytical Chemistry and Chromatography
- Epoxy Resin Curing Processes
- Fusion materials and technologies
- Nuclear Materials and Properties
- Advanced Polymer Synthesis and Characterization
- Thermal and Kinetic Analysis
- Robot Manipulation and Learning
- Mass Spectrometry Techniques and Applications
- Brain Metastases and Treatment
- Recycling and Waste Management Techniques
- Collagen: Extraction and Characterization
- Fiber-reinforced polymer composites
- Astro and Planetary Science
- Polymer Science and Applications
- Material Properties and Applications
Thales (Canada)
2022
Université Laval
2005-2021
Centre Hospitalier de l’Université de Montréal
2005
Fred Hutch Cancer Center
2005
Centre hospitalier universitaire de Québec
2005
Cégep de Chicoutimi
2005
Hôpital Maisonneuve-Rosemont
2004-2005
Centre Hospitalier Universitaire de Sherbrooke
2004-2005
Cleveland Clinic
2004
Hôtel-Dieu de Québec
2004
Many cancer patients take antioxidant vitamin supplements with the hope of improving outcome conventional therapies and reducing adverse effects these treatments. A randomized trial was conducted to determine whether supplementation vitamins could reduce occurrence severity acute radiation therapy improve quality life without compromising treatment efficacy.We a randomized, double-blind, placebo-controlled among 540 head neck treated therapy. Patients were randomly assigned into two arms....
Background: Although low dietary intakes of antioxidant vitamins and minerals have been associated with higher risks cancer, results trials testing supplementation for cancer chemoprevention equivocal. We assessed whether could reduce the incidence second primary cancers among patients head neck cancer. Methods: conducted a multicenter, double-blind, placebo-controlled, randomized trial 540 stage I or II treated by radiation therapy between October 1, 1994, June 6, 2000. Supplementation...
Abstract This article is the first of a series devoted to various aspects exchange reactions in molten bisphenol‐A polycarbonate–poly(butylene terephthalate) mixtures. The statistical between two polycondensates different chemical structure are considered. theoretical approach enables us calculate mean lengths sequences as well several expressions for degree randomness four‐component copolycondensates from triad or dyad concentrations determined by NMR spectroscopy.
Abstract In this work, the exchange reaction taking place in molten blends of bisphenol‐A polycarbonate and polybutylene terephthalate was studied. A direct transesterification mechanism catalyzed by titanium residues, present commercial PBTP, deduced. The can be ‐stopped at various levels additives capable complexing catalyst. This work enhances possibility a new approach macromolecular engineering directly combining polycondensates processing machine such as an extruder.
Abstract The structure of the four‐component copolyester resulting from exchange reaction between molten bisphenol‐A polycarbonate and poly(butylene terephthalate) is analyzed as a function time by infrared nuclear magnetic resonance spectroscopy. By applying statistical method developed earlier, mean chain length various sequences well degree randomness computed. leads initially to formation block with reduced solubility. As proceeds, soluble random copolycondensate progressively formed.
Adopting effective techniques to automatically detect and identify small drones is a very compelling need for number of different stakeholders in both the public private sectors. This work presents three original approaches that competed grand challenge on “Drone vs. Bird” detection problem. The goal one or more appearing at some time point video sequences where birds other distractor objects may be also present, together with motion background foreground. Algorithms should raise an alarm...
Abstract Exchange reactions in molten bisphenol‐A polycarbonate–poly(butylene terephthalate) mixtures are investigated by means of model reactions. Transesterification can result either from direct ester‐ester interchange or via alcoholysis acidolysis. Among the various investigated, only PBTP phenol is not found to occur. Taking into account that terephthalate units (A 2 B 1 ) and butylene carbonate formed equimolecular amounts, it concluded most likely mechanism for PC‐PBTP transesterification.
Abstract The kinetic aspects of the bisphenol‐A polycarbonate–polybutylene terephthalate exchange reaction are considered as a function temperature and PC/PBTP ratio. most likely mechanism is direct reversible ester‐ester interchange catalyzed by titanium residues present in commercial PBTP.
Abstract The viscoelastic properties and thermal expansion of bisphenol A polycarbonate have been studied in the neighborhood major glass transition temperature. discussion is given possible relation these to unusual impact resistance this polymer glassy state.
Abstract Gelation and melting of aqueous gelatin were investigated by differential scanning calorimetry. This phenomenon can be analyzed as a conventional crystallization process assuming predetermined primary nucleation unidirectional growth. The results interpreted in terms the fringed micelle model. Calculated values diameter renatured collagen fibril found excellent agreement with those determined previously electron microscopy.
Abstract A method is presented to crystallize polycarbonate of bisphenol under constant vapor pressure solvents at near ambient temperatures. Methylene chloride and acetone were used as crystallizing liquids. Acetone more powerful in inducing crystallization but the final degree crystallinity does not depend on nature solvent. The crystalline low found literature for this polymer. This very useful materials reluctant thermally induced such polycarbonate.
Abstract Primary nucleation is in general heterogeneous polymer crystallization. In unseeded polymers, the crystallization originates from a very small concentration (<0.1 percent) of unknown submicroscopic nuclei. Only three cases have mechanisms been identified with precision. The first example self‐nucleation, which relates to melt by fragments its own crystals previously present melt. Another represented epitaxial polymers on inorganic and organic substrates recently established Lotz...
Abstract Several measurements of the heat fusion and specific volume were carried out on bisphenol A‐polycarbonate varying degrees crystallinity. A linear correlation was established between these two physical variables from this an enthalpy for polycarbonate crystal 26 Kcal. deduced.
Abstract This paper concerns the action of plasticizers and nucleating agents on crystallization bisphenol‐A polycarbonate. The influence is to increase rate a great extent using 10 percent plasticizer such as trimellitic acid, tridecyloctyl ester. substances plasticized undiluted polycarbonate investigated. A large number have been found capable crystallization. un‐plasticized semi‐crystalline characterized by much higher melting point (300°C) than systems (210–245°C). stability in presence...
Abstract The crystallization of bisphenol‐A polycarbonate plasticized by trimellitic acid tridecyloctyl ester (Morflex 525) has been studied. A half‐crystallization time 100 min is observed at 170°C with 10% plasticizer compared a figure 18,000 for the unplasticized material. kinetic study limited to primary process which can be described an Avrami equation; however, coefficients are much higher than usual. Studies on effect preparation procedure samples and premelting indicate that...
Abstract The kinetics of polymerization acrylic anhydride has been studied at 34.6°C. in bulk and solution cyclohexanone dimethylformamide. order reaction with respect to the initiator concentration (azobisisobutyronitrile) varies from 0.67 1. rate is high; it remains practically constant over a range monomer 0.76 4.29 mole l. −1 ; higher concentrations, increases linearly molar concentration. results have interpreted on basis progressive insolubilization polymer molecules account residual...
Abstract The structure of the cyclopolymers acrylic anhydride has been examined by infrared spectrometry (cyclized units) and chemical analysis (bromometry for vinyl unsaturation). was based on study two carbonyl absorption bands at about 1750 1810 cm. −1 ; types cyclized hexaatomic anhydrides, different in their stereochemical structure, have shown to be present. By comparison with meso racemic varieties α,α′‐dimethyl glutaric anhydride, syndiotactic (racemic) assigned polyanhydride...