Investigation of Thermal Instability of Additive-Based
Most photovoltaics operate at high temperature under sunlight. In this work the thermal instability of diiodooctane-based high-efficiency bulk heterojunction (BHJ) organic photovoltaics (OPVs) is studied. The BHJ layers were heated to various temperatures to investigate the changes in their physical properties using atomic force microscopy phase images.
Get Price
(PDF) Study on the effect of a non-solvent additive on the
The effect of the non-solvent additive concentration on the morphological properties of the hollow fibers was studied in terms of atomic force microscopy (AFM) and scanning electron microscopy (SEM). The pore size the nodule size and the roughness parameters at the inner and outer surfaces of the hollow fibers were studied by AFM.
Get Price
Influence of Working Temperature on The Formation of
Temperature is an important parameter during electrospinning and virtually all solution electrospinning processes are conducted at ambient temperature. Nanofiber diameters presumably decrease with the elevation of working fluid temperature. The present study investigated the influence of temperature variations on the formation of polymeric nanofibers during single-fluid electrospinning.
Get Price
Effect of additives on the fabrication of poly(vinylidene
May 01 2008 · Effect of the additives on the membrane hydrophobic and mechanical propertiesThe hydrophobicity of the PVDF-HFP membranes was found to be reduced when PVP was used as the additive for membrane fabrication because of its residues trapped in the polymer matrix . The effect of LiCl or glycerol addition into the dope solution on the resultant
Get Price
Journal of Membrane Sciencertpvp
acterized by high biocompatibility especially with blood and very low toxicity. On the contrary the use of PVP for preparing membranes to be applied in MD was never reported in the literature due to its hydrophilic properties. In this work the effect of the PVP percentage in the polymeric
Get Price
Parameter Screening of PVDF/PVP Multi-Channel Capillary
He C. Effects of solvent sort PES and PVP concentration on the properties and morphology of PVDF/PES blend hollow fiber membranes. J. Appl. Polym. Sci. 2010 116 1566–1573. Google Scholar Cheng L.P. Effect of Temperature on the Formation of Microporous PVDF Membranes by Precipitation from 1-Octanol/DMF/PVDF and Water/DMF/PVDF Systems.
Get Price
How Temperature Impacts Oil Condition
These are only a few of the side effects of running at a higher temperature but they play a critical role in the overall health of the machine and the lubricant. The relationship between temperature and chemical reaction rates (oxidation or the chemical aging of the oil) was theorized by Svante Arrhenius around the turn of the 19 th century.
Get Price
(PDF) Study on the effect of a non-solvent additive on the
The effect of the non-solvent additive concentration on the morphological properties of the hollow fibers was studied in terms of atomic force microscopy (AFM) and scanning electron microscopy (SEM). The pore size the nodule size and the roughness parameters at the inner and outer surfaces of the hollow fibers were studied by AFM.
Get Price
Effect of polymer and additive on the structure and
wt additive polyvinylpyrrolidone (PVP) as viscosity enhancer was also prepared for spinning. Stainless steel hollow fibers were spun by dry-wet spinning method and the details were described elsewhere 21-23 . All spinning experi-ments were carried out at room temperature and an overview of the spinning conditions are described in Table 1.
Get Price
(PDF) Effect of nonsolvents on properties of spinning
Table 22Degree of saturation (DS) of spinning solutions obtained at the nonsolvent concentrations tested Additive ( ) Water PVP PEG 5 0.53 0.12 0.26 7.5 0.79 ± ± 10 ± 0.23 0.51 Cloud point ( ) 9.5 43 19.5 DSgrams of additive used/grams of additive causing phase separation.
Get Price
493. Polyvinylpyrrolidone (PVP) (WHO Food Additives Series 15)
BIOLOGICAL DATA Povidone is the generic name for polyvinylpyrrolidone (PVP). It is the soluble homopolymer of N-vinyl-2-pyrrolidone. As a food additive it appears as the form identified as K-30. To clarify the discussion the relationship of K-30 to other marketed forms is as follows Form K-range Average molecular weight K-15 or 17 12-18 10
Get Price
Effect of poly(vinylpyrrolidone) additive on the
Effect of high-temperature spinning and PVP additive on the properties of PVDF hollow fiber membranes for microfiltration. Macromolecular Research 2006 14 (6) .
Get Price
493. Polyvinylpyrrolidone (PVP) (WHO Food Additives Series 15)
BIOLOGICAL DATA Povidone is the generic name for polyvinylpyrrolidone (PVP). It is the soluble homopolymer of N-vinyl-2-pyrrolidone. As a food additive it appears as the form identified as K-30. To clarify the discussion the relationship of K-30 to other marketed forms is as follows Form K-range Average molecular weight K-15 or 17 12-18 10
Get PriceLight Stabilizers/UV AbsorbersPolymer Additives
Oct 30 2019 · TAGS Light Stabilizers/UV Absorbers Heat Stabilizers The service life of polymers is limited by their degradation. Degradation can be caused by a number of environmental factors e.g. temperature humidity impurities mechanical load irradiation microorganisms chemicals and air.
Get Price
Parameter Screening of PVDF/PVP Multi-Channel Capillary
He C. Effects of solvent sort PES and PVP concentration on the properties and morphology of PVDF/PES blend hollow fiber membranes. J. Appl. Polym. Sci. 2010 116 1566–1573. Google Scholar Cheng L.P. Effect of Temperature on the Formation of Microporous PVDF Membranes by Precipitation from 1-Octanol/DMF/PVDF and Water/DMF/PVDF Systems.
Get Price
(PDF) Study on the effect of PVP additive on the
Study on the effect of PVP additive on the at room temperature and at an operating pressure of 5 psig. The objective of this study is to investigate the effect of spinning conditions on
Get Price
Effect of Alcohol as Additives on the Morphology and
L/m2.h.bar while rejections of PEG MW20 000 and PVP MW40 000 for wet-spun PES hollow fiber membranes were decreased with increased of n-propanol concentration up to 20 . Using above method PES hollow fiber UF membrane with high pure water permeation flux
Get Price
Effect of PVP content and polymer concentration on
With the addition of PVP the rejection of the PEI membrane increased from 6.32 10 13 to 11.2 10 13 and the rejection of the PAN membrane increased from 0.1 10 13 to 1.1 10 13. Thus PVP addition has an adverse effect on total rejection and membrane rejection.
Get PriceFabrication of Ag nanowire/polymer composite nanocables
Mixed effect of main electrospinning nanocables exhibited great stability under high temperature and high humidity conditions. 2. Experiment 2.1. Materials The AgNW/PVP nanocables were fabricated by e-spinning with the precursor solution 2.8 (w/v) AgNWs and 5 (w/v) PVP in ethanol. However PVDF is not dissolved into ethanol or methanol.
Get Price
Effect of water content on the glass transition
Jan 05 2018 · Zhang and Zografi used PVP of a higher molecular weight and reported a glass transition temperature of about 420 K for dry PVP-trehalose at the same mass ratio of trehalose to PVP as that used in our experiments . This slightly higher T g value is consistent with the expected increase in T g with PVP molecular weight .
Get PriceInfluence of Working Temperature on The Formation of
Temperature is an important parameter during electrospinning and virtually all solution electrospinning processes are conducted at ambient temperature. Nanofiber diameters presumably decrease with the elevation of working fluid temperature. The present study investigated the influence of temperature variations on the formation of polymeric nanofibers during single-fluid electrospinning.
Get PriceEffect of water content on the glass transition
Jan 05 2018 · Zhang and Zografi used PVP of a higher molecular weight and reported a glass transition temperature of about 420 K for dry PVP-trehalose at the same mass ratio of trehalose to PVP as that used in our experiments . This slightly higher T g value is consistent with the expected increase in T g with PVP molecular weight .
Get Price
Effects of ShearingBob is the Oil Guy
Mar 22 2011 · To simulate the shearing effect with different types of oils I use an old snake oil additive salesman machine called a Timken machine. This machine was and is used only by oil additive companies only. I have not seen any oil company (except one) that will demonstrate how well their oil will hold up on this machine.
Get Price
Effect of high-temperature spinning and PVP additive on
Effect of high-temperature spinning and PVP additive on the properties of PVDF hollow fiber membranes for microfiltration By Bong Jun Cha and Jung Mok Yang Cite
Get PriceEffect of Polymers (PEG and PVP) on Sol-Gel Synthesis of
Fibers irregular and seed-like microcrystalline ZnO were synthesized by using a cost-effective and low temperature aqueous sol-gel method. Various polymers namely polyethylene glycol 6000 (PEG 6000) and polyvinyl pyrrolidone (PVP) were used as structure directing agents. The samples were characterized by X-ray diffraction (XRD) Fourier transform infrared spectroscopy (FTIR) and
Get Price
Effect of high-temperature spinning and PVP additive on
Dec 01 2006 · Due to these effects the rejection rate and strength of the fibers were increased at the expense of reduced water flux and mean pore size which indicates that high-temperature spinning and PVP addition are very effective to control the morphology of PVDF hollow fiber
Get Price
Journal of Membrane Science Research
3.1. The effect of air gap length on hollow fibers at low and high PVP concentration in dope solution Figure 1 shows the cross section morphologies of hollow fibers spun with dope1 containing high concentration of PVP 15 at air gap length 80 40 20 and 10 mm respectively. As could be observed hollow fibers spun at the
Get Price
Effect of PVP Lithium Chloride and Glycerol Additives on
Effect of PVP Lithium Chloride and Glycerol Additives on PVDF Dual-Layer mixing the polymer and diluent at high temperature followed by cooling to induce phase separation. Subsequent removal of to and maintained at 140oC and the spinning temperature was 150 oC. After passing through the
Get Price
(PDF) Study on the effect of PVP additive on the
Study on the effect of PVP additive on the at room temperature and at an operating pressure of 5 psig. The objective of this study is to investigate the effect of spinning conditions on
Get Price
