Poly(Vinyl Chloride) Containing Gynostemma pentaphyllum as a Photostabilizer

2021 ◽  
Vol 1021 ◽  
pp. 251-259
Author(s):  
Zeyad Fadhil ◽  
Hadeel Adil ◽  
Raghda Alsayed ◽  
Mohammed H. Al-Mashhadani ◽  
Ali H. Jawad ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Vinyl Chloride ◽  
Aging Process ◽  
Uv Light ◽  
Polymeric Films ◽  
Gynostemma Pentaphyllum ◽  
Poly Vinyl Chloride ◽  
Electronic Microscope ◽  
Scanning Electron

Novel extracted natural stabilizer for the polymer was investigated in this study. The natural anti-aging was extracted from plants and it is demonstrated that this type of stabilizers are suitable for biodegradable polymers. Gynostemma pentaphyllum (0.01–0.03 wt%) were extracted and added to the poly(vinyl chloride) blend. The achieved polymeric films were exposed to an accelerated UV light aging process for 300 hours at ambient temperature. The efficiency of tested natural stabilizer was linked to blank PVC films. FTIR spectroscopy, weight loss, electronic microscope and scanning electron microscopy were performed. Using small amount of natural stabilizer is significantly beneficial because it does not influence the PVC properties.

Electrospun Conditions of Poly(vinyl chloride) Nanofibrous Membrane Plasticized with Polyurethane

2014 ◽  
Vol 68 (5) ◽  
Author(s):  
Kritsada Phatcharasit ◽  
Wirach Taweepreda ◽  
Kanoktip Boonkerd ◽  
Jin-Kuk Kim
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Glass Transition ◽  
Thermal Properties ◽  
Vinyl Chloride ◽  
Poly Vinyl Chloride ◽  
Lcr Meter ◽  
Scanning Electron

Electrospun poly(vinyl chloride) (PVC) nanofibrous were prepared by electrospinning. Various concentration of polyurethane (PU) were added to PVC solution for plasticization of the electrospun nanofibrous. The pristine and plasticized nanofibrous were characterized by field emission scanning electron microscopy (FE-SEM), differencial thermal analysis (DTA), and thermogravimetry analysis (TGA), respectively. Thermal properties form DTA and TGA results indicated that the addition of PU decreased glass transition temperature (Tg) of PVC and increased heat resistance of PVC nanofiber. The dielectric constant of plasticized nanofibrous measured using precision LCR meter indicated that the membrane were dense.  

Vinyl-functionalized polysiloxane as radical scavenger during the degradation of poly(vinyl chloride)

2019 ◽  
pp. 089270571989505
Author(s):  
Xiaojian Zhou ◽  
Magda E Tawfik ◽  
Salwa H El-Sabbagh ◽  
Sara N Ghanem ◽  
Hisham A Essawy
Keyword(s):  
Electron Microscopy ◽  
Vinyl Chloride ◽  
Thermal Processing ◽  
Uv Light ◽  
Radical Scavenger ◽  
Poly Vinyl Chloride ◽  
Siloxane Polymer ◽  
Residual Weight ◽  
Scanning Electron ◽  
Silicone Polymer

Siloxane polymer containing vinyl groups was blended with poly(vinyl chloride) (PVC) to convey plasticization and stability against decomposition, that is likely to happen during thermal processing or following exposure to the ultraviolet (UV) light. The immiscibility between silicone rubber and PVC was proved from images acquired using scanning electron microscopy (SEM), which revealed worsening of the situation at higher loading (10 wt%) of silicone polymer. The thermal degradation profiles indicated that the inclusion of silicone polymer did not affect the thermal resistance significantly between 200°C and 350°C. However, it protected the matter from intensive decomposition at higher temperatures and increased the residual weight. Fourier transform infrared spectra were collected for the blends after exposure to UV radiation for 168 h, from which the absence of appreciable dehydrochlorination or change in the nature of the material was ensured. The hampering of dehydrochlorination is expected to have proceeded by instant attack of any appearing radicals on PVC backbone onto vinyl groups of the silicone polymer and buildup of a network structure.

Electrospun Epoxidized Natural Rubber with Poly(vinyl chloride) (ENR-PVC) Nanofibrous for PEMFC Applications

2013 ◽  
Vol 844 ◽  
pp. 507-510 ◽  
Author(s):  
Kritsada Phatcharasit ◽  
Wirach Taweepreda ◽  
Kanoktip Boonkerd ◽  
Jin Kuk Kim
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Natural Rubber ◽  
Vinyl Chloride ◽  
Epoxidized Natural Rubber ◽  
Electrospinning Technique ◽  
Poly Vinyl Chloride ◽  
Ft Ir ◽  
Scanning Electron

Various electrospun epoxized natural rubber / poly (vinyl chloride) (ENR/PVC) blend nonwoven membranes were prepared by electrospinning technique. Various concentration of epoxidized natural rubber (ENR) solution in N,N-dimethylformamide (DMF) were directly added to PVC solution for plasticization of the electrospun nanofibrous. Differencial thermal analysis (DTA), thermogravimetry analysis (TGA), fourier transfrom infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) were used to characterize the pristine and plasticized nanofibrous. DTA results indicated that the addition of ENR resulted in the shifting of glass transition temperature (Tg) towards lower temperatures. The blending of PVC with ENR is thermodynamically incompatible.

scholarly journals Valorisation of chicken feather fibres in developing poly (vinyl chloride) biocomposites

2021 ◽  
Author(s):  
Soumia Touatou ◽  
Naima Belhaneche-Bensemra
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thermogravimetric Analysis ◽  
Vinyl Chloride ◽  
Morphological Properties ◽  
Chicken Feather ◽  
Chicken Feathers ◽  
Poly Vinyl Chloride ◽  
Two Temperatures ◽  
Scanning Electron

Abstract The aim of this paper is the valorisation of fibres obtained from chicken feathers in developing new poly (vinyl chloride) (PVC) biocomposites. Feather fibres were first characterized by thermogravimetric analysis and scanning electron microscopy. Then, semi-rigid and flexible PVC biocomposites were prepared by varying the fibre (5, 10 and 15 wt %) and plasticizer (15, 30, 45, 60 wt %) contents. The density, mechanical, thermal and morphological properties of the composites were investigated. The water absorption was determined at two temperatures (23 and 60°C). The results showed the influence of fibre and plasticizer contents on the considered properties.

Study on the Relativity between Intrinsic Coercivity and Microstructure of the Nd-Fe-B Magnet Treated by the Optimized Aging Process

2014 ◽  
Vol 1002 ◽  
pp. 73-76 ◽  
Author(s):  
Xia Ding ◽  
Xiao Li Wang ◽  
Cong Hui Si ◽  
Li Na Zhao ◽  
Kai Hong Ding ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Process Optimization ◽  
Aging Process ◽  
Thermal Field ◽  
Aging Treatment ◽  
Optical Microscope ◽  
Intrinsic Coercivity ◽  
Energy Disperse Spectroscopy ◽  
Scanning Electron

In order to increase the intrinsic coercivity of the Nd-Fe-B magnets, the aging process optimization had been carried out. The results showed that more than 17 kOe intrinsic coercivity could be obtained by the aging process optimization. The microstructures and the fractures of the Nd-Fe-B magnets treated by the optimized aging process were also investigated by optical microscope, thermal field emission scanning electron microscopy and energy disperse spectroscopy. It was showed that the thin, continuous and smooth Nd-rich layer along the boundaries of the main crystal phase Nd2Fe14B could be formed by the optimized aging treatment and it resulted in the increase of the intrinsic coercivity of the Nd-Fe-B magnets.

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