Recent developments in degradation and stabilization

Braun, D.

doi:10.1351/pac198153020549

Cited by 60 publications

(16 citation statements)

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“…PVC is reputed for its propensity to undergo dehy drochlorination, either thermally or chemically, to gener ate unsaturations within the matrix [291][292][293][294]. Guo et al [295] transformed PVC (M n = 93,900) into polyacetylene like poly mers with long polyene sequences (about 27 sequences) (DPVC) via dehydrochlorination by KOH in THF and in the presence of PEO400 as phase transfer catalyst.…”

Section: Iodine-polyacetylene Complexesmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

166

127

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A unique feature of molecular iodine by far, is its ability to bind to polymeric materials. A plethora of natural and synthetic polymers develop complexes when treated with molecular iodine, or with a mixture of mole cular iodine and potassium iodide. Many unexpected findings have been encountered upon complexation of iodine and the polymer skeleton, including the color formation, the polymer morphology changes, the compl exation sites or regions, the biological activity, and the electrical conductivity enhancement of the complexes, with poly iodides (I n¯) , mainly I 3¯ and I 5¯, as the actual binding species. Natural polymers that afford such complexes with iodine species are starch (amylose and amylopectin), chitosan, glycogen, silk, wool, albumin, cellulose, xylan, and natural rubber; iodinestarch being the oldest iodinenatural polymer complex. By contrast, numerous synthetic polymers are prone to make com plexes, including poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), nylons, poly(Schiff base)s, poly aniline, unsaturated polyhydrocarbons (carbon nano tubes, fullerenes C 60 /C 70 , polyacetylene; iodinePVA being the oldest iodinesynthetic polymer complex.

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Section: Iodine-polyacetylene Complexesmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

166

127

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“…Although a few attempts have been carried out to correlate structural defects and degradation rate (35,36), the situation is far from satisfactory at th'e moment.…”

Section: Discussionmentioning

confidence: 99%

Defects in the molecular structure of polyvinylchloride and their relation to thermal stability

Guyot¹

1985

Pure and Applied Chemistry

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“…The annual production of PVC materials is lower only than that of polyethylene (PE) (Yang et al 2005;Huang et al 2010;Mendez et al 2011;Zhu et al 2012). However, the thermal stability of PVC is poor; it starts to decompose when heated to 100 °C, and the decomposition rate is accelerated when the temperature is over 150 °C (Braun 1981). Furthermore, the vicat softening temperatures (VSTs) of PVC materials are usually under 80 °C (Kamira and Naima 2006), which restricts its application.…”

Section: Introductionmentioning

confidence: 99%

Polyvinyl Chloride / Attapulgite / Micro-crystalline Cellulose (MCC) Composites Preparation and Analysis of the Role of MCC as a Compatibilizer

Wang¹,

Zhang²,

Huang³

et al. 2015

BioResources

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To improve the performance of polyvinyl chloride (PVC), composites incorporating polyvinyl chloride (PVC), attapulgite nanoparticles (ANPs), and microcrystalline cellulose (MCC) were successfully prepared. The composites had higher vicat softening temperatures (VSTs) and the MCC had a great influence on mechanical properties of the composites. When MCC was added from 0 to 5 per hundred parts of PVC (phr), the mechanical properties of the composites increased, but the mechanical properties of the composites decreased when the MCC was more than 5 phr. The tensile breaking stress, tensile strength, and impact strength were maximized with increases of 19.76 N (4.1%), 29.66 MPa (15.5%), and 13.8 MPa (7%) when 5 phr MCC was added. Infrared spectral analysis indicated that MCC and ANPs were present in the composites. Scanning electron microscopy showed that the composites system was distributed into two phases, which indicated that MCC in composites was dissolved in the PVC matrix, and some of MCC coated the surface of ANPs as a compatibilizer. Overall, this study provided a promising method for PVC modification to improve its performance.

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Recent developments in degradation and stabilization

Cited by 60 publications

References 0 publications

Molecular iodine/polymer complexes

Molecular iodine/polymer complexes

Defects in the molecular structure of polyvinylchloride and their relation to thermal stability

Polyvinyl Chloride / Attapulgite / Micro-crystalline Cellulose (MCC) Composites Preparation and Analysis of the Role of MCC as a Compatibilizer

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