Showing papers in "Polymer Degradation and Stability in 2015"

TL;DR: In this article, a set of complementary advanced thermal techniques, rarely applied in polysaccharides characterizations, were used to reveal thermal events and identify degradation products as a function of the temperature: three main steps in chitosan (N deacetylation degree, DD = 78%) thermal degradation were highlighted and mechanism proposed.

TL;DR: In this article, a short review of the recent advances in DOPO chemistry, classifying its derivatives based on the chemical reactions and functional groups is presented, as well as some characteristic applications of these derivatives with important flammability performance.

TL;DR: In this paper, five different polypyrroles (PPys) with four different oxidants, namely, FeCl3, Fe3·6H2O, Fe2(SO4)3, and Fe2S2O8, were aged for 400 days in ambient air at a temperature of 24°±2°C in a laboratory, where they were not directly exposed to the sun.

TL;DR: In this article, a phosphorous/nitrogen-containing reactive phenolic derivative (DOPO-HPM) was synthesized via the addition reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10oxide and N-(4-hydroxyphenyl) maleimide (HPM).

TL;DR: In this paper, a reaction flame retardant hexa-(phosphite-hydroxyl-methyl-phenoxyl)-cyclotriphosphazene (HPHPCP) was synthesized by hexachlorocyclotri phosphazenes, diethyl phosphite and p -hydroxybenzaldehyd.

TL;DR: In this article, two mono and one bis DOPO-phosphonamidates were synthesized and incorporated in polyether-based polyurethane (PU) manufacturing process.

TL;DR: In this paper, the authors investigated the biodegradability of poly(butylene adipate-co-terephthalate) (PBAT)/thermoplastic starch films before and after a three-month soil burial test.

TL;DR: In this paper, a novel polymeric intumescent flame retardant, named poly(ethanediamine−1,3,5-triazine- o -bicyclic pentaerythritol phosphate) (PETBP), was synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), solid-state 13 C nuclear magnetic resonance (13 C NMR), 31 P NMR and elemental analysis (EA).

TL;DR: In this paper, a novel polymeric intumescent flame retardant, poly(4,4′-diamino diphenyl sulfone 2,6,7-trioxa-1phosphabicyclo[2.2]octane-4methanol (PEPA)-substituted phosphoramide) (PSA), has been synthesized through solution polycondensation.

TL;DR: In this article, the authors investigated the permeability behavior of commercial poly(butylene succinate) (PBS) and poly (butane succinate-co-adipate) (PBSA) polymers after food contact simulants and photo and thermal-oxidative degradation processes.

TL;DR: In this article, a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10oxide (DOPO)-based flame retardant (D-bp) was successfully synthesized via the addition reaction between DOPO and Schiff-base obtained in advance by the condensation of 4,4'-diaminodiphenyl methane (DDM) and 4-hydroxybenzaldehyde.

TL;DR: Alkali lignin was used as flame retardant for polybutylene succinate (PBS) biopolyester as mentioned in this paper, and was successfully surface modified by grafting molecular or macromolecular phosphorous compounds.

TL;DR: In this article, the degradation behaviors under outdoor and accelerated laboratory weathering conditions of isotactic polypropylene (iPP) were compared, aiming to establish a correlation between both weathering types.

TL;DR: In this paper, Nanostructured additives (Nanos) were used to reduce flammable gas release rate and to form highly protective char layer of rigid PU foams.

TL;DR: The effects of different shell materials on the properties of microencapsulated flame retardant and composites have been carefully and thoroughly discussed in this paper, where it has been demonstrated that micro-encapsulation provides better water resistance, flame retardancy, compatibility and higher pyrolysis temperature, etc.

TL;DR: In this paper, the effect of supercritical carbon dioxide (scCO 2 ) processing, gamma irradiation, comonomer ratio and temperature on the hydrolysis of individual poly lactide-co-glycolide (PLGA) microparticles, using a combination of Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) imaging, Scanning Electron Microscopy (SEM), Differential Scanning Calorimetery (DSC) and Gel Permeation chromatography (GPC) to facilitate a better understanding

TL;DR: In this article, a study of the mechanical recycling of high density polyethylene (HDPE) was simulated by one-hundred (100) consecutive extrusions cycles and the results indicated significant structural changes in the material that occurred during the first 30 extrusion cycles.

TL;DR: In this paper, a novel phosphorus-nitrogen flame retardant (DOPO-BA) was synthesized from the condensation reaction of benzaldehyde, aniline and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10oxide.

TL;DR: In this article, the effects of thermal aging on fiber reinforced polymer (FRP) composites with anhydride cured epoxy resin matrices were investigated, and the effects on the flexural properties, molecular structures, free volume fraction, and mechanical properties were investigated.

TL;DR: In this paper, a scheme of DNA degradation mechanism is proposed to account for the results of the study and a number of characterization techniques have been exploited to investigate DNA decomposition, namely: thermogravimetry coupled with infrared spectroscopy or combined with differential thermal analysis, pyrolysis-combustion flow calorimetry and analysis of degradation residues.

TL;DR: In this paper, the potential flame retardant effect of different metallic phytates as biosourced phosphorous additives for poly(lactic acid) (PLA) was evaluated, starting from sodium phytate, the sodium cations were replaced by aluminum, iron or lanthanum cations as attested by elemental analysis.

TL;DR: In this article, a nanocomposite films based on poly(lactic acid) (PLA) reinforced with cellulose nanocrystals extracted from Posidonia Oceanica plant were prepared by solvent casting method containing 1 or 3% of cellulose nanoparticles unmodified (CNC) and modified using a commercial surfactant (s-CNC).

TL;DR: In this article, the introduction of phosphorus into the reinforcing fibres decreased the flammability not only of the hemp fabrics, but also of the epoxy composites made thereof.

TL;DR: In this paper, a rigid polyurethane foams (RPUFs) with [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester (BH)/expandable graphite (EG) were prepared via box-foaming in our laboratory.

TL;DR: In this paper, the thermally stable properties of water-soluble polyacrylamide (PAM) and partially hydrolyzed polyacRYlamide(HPAM) polymers under various solution conditions have been studied utilizing Density Functional Theory (DFT) computational modeling method.

TL;DR: In this article, the authors used the Fourier Transform Infrared Transform (FTIR) in combination with lab-scale composting setup to investigate the selective composting of two-phase biodegradable blends based on polylactic acid (PLA) or polyhydroxybutyrate (PHB), toughened through melt blending with poly (butylene adipate-co-terephthalate) (PBAT), referred to as PLPT50 and PHPT50 respectively.

TL;DR: In this paper, the effect of sepiolite as a synergistic agent on the flame retardancy and thermal degradation behavior of polyamide 6,6 (PA66)/aluminium diethylphosphinate (AlPi) composites were investigated by limiting oxygen index (LOI), vertical burning (UL-94) tests, thermogravimetric analysis/infrared spectrometry (TG-IR) and cone calorimeter tests (cone).

TL;DR: In this paper, the authors studied the mechanical strength of different silicone rubber composites (SR-composites) before and after pyrolysis properties such as tensile strength, elongation at break, thermal stability, volume variation and residue strength.

TL;DR: In this paper, a series of ReaxFF simulations are carried out to study the pyrolysis mechanisms of polyimide, and the effects of temperature on the distribution of various products are investigated.