polymer degradation and stability

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Polymer Degradation and Stability 96 (2011) 686e702 photopatterning of the material without the need for a hardmask [19] Small amounts of residue were observed in the cavities following decomposition [19 24 25] Improved decomposition was reported by using a combination of PAGs generating acids with different vapor pressures [18] In this work the thermal decomposition behavior of solvent Gases released during the degradation of the foam and of the coated foams were analyzed using a TGA apparatus (TGA Q5000 TA Instrument) connected to a Fourier transformed infrared (FTIR) spec-trometer (ThermoScientific) Nicolet iS10 The IR spectra were recorded between 400 cm−1 and 4000 cm−1 (spectra recorded every 5 s) For

Polymer degradation

Polymer degradation is a change in the properties—tensile strength color shape etc —of a polymer or polymer-based product under the influence of one or more environmental factors such as heat light or chemicals such as acids alkalis and some salts These changes are usually undesirable such as cracking and chemical disintegration of products or more rarely desirable as in

Publication date: December 2019Source: Polymer Degradation and Stability Volume 170Author(s): Reece N Oosterbeek Kyung-Ah Kwon Patrick Duffy Sean McMahon Xiang C Zhang Serena M Best Ruth E CameronAbstractPoly-l-lactide (PLLA) is a popular choice for medical devices due to its bioresorbability and superior mechanical properties compared with other polymers However although

Polymer Degradation and Stability 112 (2015) 137e144 PA6 chain mobility and consequently increases the probability of the reaction between the eNH2 and eOeCOeOe groups of the polyamide 6 and polycarbonate respectively The incorporationof 5 wt% of PPO in PA6/PC blend proved sufficient to raise the reac-tion speed of PA6-b-PC copolymer formation but the resulting materials were still

Krzysztof Rodzeń Adam Strachota Vladimr Raus Ewa Pavlova Polyhedral oligomeric butyl stannoxane cages (Sn-POSS) as oxidation-activated linear repairing units or crosslinking nano-building blocks depending on structure of the polymer matrix Polymer Degradation and Stability 10 1016/j polymdegradstab 2017 05 019 142 (1-20) (2017)

degradation products detected by FTIR spectrophotometry These pro-ducts include carbonyls especially aromatic (at 1690 cm−1) and ali-phatic ketones (1724 cm−1) and anhydrides (1840 and 1860 cm−1) as well as hydroxyls (3553 and 3514 cm−1) [2–6] The disappearance of the IR absorption bands which are characteristic to the isopropylidene

Polymer Degradation and Stability

2482 Z Matusinovic et al / Polymer Degradation and Stability 97 (2012) 2481e2486 MoS2 nanocomposites at 10% MoS2 content showing representa-tive structures from several micrometers down to the nanometer size features where individual layers can be resolved The MoS2 particles are quite hard and during the ultramicrotoming process were evidently pulled out leaving behind voids

Polymer degradation and stability A A 2019/2020 6 Crediti massimi 48 Ore totali SSD CHIM/04 Lingua Inglese Corsi di laurea che utilizzano l'insegnamento Industrial chemistry (Classe LM-71)-students enrolled from the academic year 2019-2020 Obiettivi formativi The aim of this course is to explain the degradation phenomena affecting a polymer during the different phases of its life

Polymer Degradation and Stability Supports open access View aims and scope Submit your article Guide for authors 4 23 CiteScore 3 78 Impact Factor Editors-in-Chief: Jean-Luc Gardette View editorial board View aims and scope Explore journal content Latest issue Articles in press Article collections All issues Sign in to set up alerts RSS | open access RSS Latest issues Volume 179

modifies the mechanical properties and the chemical stability of the paints [11] It was found that alkyd based paints were chalking increasingly depending onwavelengths below 340 nm [12] Photo-degradation can be considered as a surface phenomenon affecting primarily the first 5e10 mm of the paint layer [13] The degradation

Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology Deteriorative reactions occur during processing when polymers are subjected to heat oxygen and mechanical stress and during the useful life of the materials when oxygen and sunlight are the

This degradation occurs in sequential steps bio-deterioration (altering the chemical and physical properties of the polymer) bio-fragmentation (polymer breakdown in a simpler form via enzymatic cleavage) and assimilation (uptake of molecules by microorganisms) and mineralization (production of oxidized metabolites (CO 2 CH 4 H 2 O) after degradation) which are shown in Fig 3

This is known as polymer degradation This caused heavy losses and has been regarded as one of the most faced issues There are certain types of degradations which are commonly referred to as polymer change as well Further you get to know about the most common types of degradations of polymers It is also to be noted that degradation types are numerous but only a few are explained here to

Polymer Degradation and Stability 96 (2011) 686e702 photopatterning of the material without the need for a hardmask [19] Small amounts of residue were observed in the cavities following decomposition [19 24 25] Improved decomposition was reported by using a combination of PAGs generating acids with different vapor pressures [18] In this work the thermal decomposition behavior of solvent

Polymer Degradation and Stability

Polymer Degradation and Stability 96 (2011) 301 e 313 CNT nanocomposite follow a pathway which is different from that of MMT systems [5 6] The family of layered double hydroxides (LDH) are new mate-rials as re retardant additives Interest in these LDHs developed after Zammarano et al showed that the addition of an LDH to polyamide 6 gave enhanced re retardancy [7] The situation with LDHs

for Reproduction (CMR) were detected A broad range of alkanes specific of PP matrix degradation was also identified Finally measured concentrations of substances found in this work and listed in Vehicle Indoor Air Quality (VIAQ) standards were gathered in order to discuss the biocomposites emissions impact on indoor air quality 1 Introduction The development of natural fibers used as

CiteScore: 4 23 ℹ CiteScore: 2019: 4 230 CiteScore measures the average citations received per document published in this title CiteScore values are based on citation counts in a given year (e g 2015) to documents published in three previous calendar years (e g 2012 – 14) divided by the number of documents in these three previous years (e g 2012 – 14)

Polymer Degradation and Stability 94 (2009) 1867–1875 photoelectron spectroscopy the D-pen molecule when dissolved forms a zwitterion [7] The chief metabolic in vivo transformation of D-pen in patients with RA is the oxidation of this species to D-pen–protein disulfides [8–11] D-pen a strong chelating agent reduces Cu(II) to Cu(I) (Scheme 4) while at the same time being oxidized

Polymer degradation is a change in the properties (tensile strength color shape etc) of a polymer or polymer-based product under the influence of one or more environmental factors such as heat light or chemicals such as acids alkali and some salts These changes are usually undesirable such as cracking and chemical disintegration of products or more rarely desirable as in bio

Polymer Degradation and Stability 1995 47 2 165-173 Legislative threats restricting the use of disposable nondegradable plastic because of its environmental problems have generated interest in the use of degradable plastics An extensive search for potential biodegradable fillers for thermoplastics led to the conclusion that even today starch is a cost effective additive with the

Gases released during the degradation of the foam and of the coated foams were analyzed using a TGA apparatus (TGA Q5000 TA Instrument) connected to a Fourier transformed infrared (FTIR) spec-trometer (ThermoScientific) Nicolet iS10 The IR spectra were recorded between 400 cm−1 and 4000 cm−1 (spectra recorded every 5 s) For

Polymer Degradation and Stability 114 (2015) 45e51 free radical formation via this method In this study elevated temperature exposure will be used to accelerate degradation since the reaction pathways are assumed to be similar once free radicals are initiated Costa and co-authors have discussed ther- mal photo and mechano-oxidation of UHMWPE in detail and their work includes a

2482 Z Matusinovic et al / Polymer Degradation and Stability 97 (2012) 2481e2486 MoS2 nanocomposites at 10% MoS2 content showing representa-tive structures from several micrometers down to the nanometer size features where individual layers can be resolved The MoS2 particles are quite hard and during the ultramicrotoming process were evidently pulled out leaving behind voids

Iran Polymer and Petrochemical Institute (IPPI) P O Box 14965/115 Tehran Iran article info Article history: Received 20 October 2010 Accepted 5 December 2010 Available online 13 December 2010 Keywords: Recycling Polyvinyl chloride (PVC) Separation techniques Mixed plastic wastes abstract PVC is a universal polymer which can be processed into a wide variety of short-life or long-life

Polymer Degradation and Stability 98 (2013) 2801e2812 this paper is to discuss the most recent works reported the me-chanical and chemical recycling of some traditional polymers and their systems including blends and composites 2 Discussion 2 1 Polylactic acid (PLA) and its systems PLA is one of the most important biodegradable polyesters derived from renewable sources (mainly starch and