Preparation and Characterization of PVA-MSA/mCS Bipolar Membrane

2013 ◽  
Vol 634-638 ◽  
pp. 2336-2341
Author(s):  
Hong Fang Xie ◽  
Yan Chun Xiao ◽  
Mei Zhen Zhou ◽  
Shuang Chen ◽  
Zhen Chen
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Contact Angle ◽  
Nano Materials ◽  
Bipolar Membrane ◽  
Nano Tio2 ◽  
Nano Zno ◽  
Cation Layer ◽  
Nano Fe3o4

Polyvinyl Alcohol (PVA) was blent with sodium alginate (SA) and chitosan (CS) respectively in order to enhance flexibility and compatibility of bipolar membrane(BPM). The PVA-mSA/mCS BPM was prepared by a paste method. The PVA/ SA and the PVA / CS was cross-linked by inorganic nano-materials and glutaraldehyde(GA), respectively. The SEM photographs showed the PVA-ZnO-SA/mCS BPM was consists of anion layer and cation layer. The thickness of the BPM was 121μm, the interface of BPM was 5μm. The Electronic spectrum (EDS) indicated that ZnO well-distributed in cation layer. The J-V curve and the AC impedances of PVA-ZnO-SA/mCS BPM showed lower working voltage and smaller membrane impedance. The contact Angle of PVA-ZnO-SA/mCS dropped down from the original 101.01° to 32.65°. Compared of TG curves of the BPMs modified by nano-Fe3O4, nano-TiO2 and nano-ZnO, the surface of the PVA-ZnO-SA/mCS BPM exhibited stronger hydrophilic. The dopping nano-ZnO improved the hydrophilic property, thermal stability and mechanical properties of the PVA-ZnO-SA/mCS.

Expanded vermiculite-filled flexible polymer composites

2021 ◽  
pp. 009524432110290
Author(s):  
Mukaddes Sevval Cetin ◽  
Ozan Toprakci ◽  
Omer Suat Taskin ◽  
Abdullah Aksu ◽  
Hatice Aylin Karahan Toprakci
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Contact Angle ◽  
Polymer Composites ◽  
Flame Retardancy ◽  
Composite Films ◽  
Filler Concentration ◽  
High Shear ◽  
Flexible Polymer ◽  
Shear Mixing

This study focuses on the fabrication and characterization of vermiculite-filled flexible polymer composites. Exfoliated vermiculite was incorporated into triblock thermoplastic elastomer copolymer, styrene- b-(ethylene- co-butylene)- b-styrene (SEBS), at various levels from 1 to 15 wt% by a high shear mixer. The composite films were obtained by the combination of solvent casting and compression molding. The morphological, structural, thermal, and mechanical properties and contact angle of the composites were determined. Some micro-morphological differences were observed between the samples and the difference was assumed to be caused by high shear mixing and filler concentration. High shear mixing was found effective in terms of the detachment of vermiculite layers at all concentrations. However, at low filler loading, that behavior was more obvious. At 1 wt% filler concentration, mechanical properties increased that was probably caused by good filler-matrix interaction stemmed from smaller particle size. At higher vermiculite concentrations, fillers found to show agglomerations that led to a decrease in mechanical strength and strain at break. Elastic and secant modulus showed an increasing trend. Contact angle measurements were carried out to determine the oleophilic character of the samples. An increase in the vermiculite content resulted in higher oleophilic character and the lowest contact angle was obtained at 15 wt% VMT loading. In addition to these, thermal stability, thermal dimensional stability and flame retardancy were improved by the incorporation of VMT. 15 wt% vermiculite-filled sample showed the best performance in terms of thermal stability and flame retardancy.

scholarly journals Ecofriendly Preparation and Characterization of a Cassava Starch/Polybutylene Adipate Terephthalate Film

Processes ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 329
Author(s):  
Tan Yi ◽  
Minghui Qi ◽  
Qi Mo ◽  
Lijie Huang ◽  
Hanyu Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Water Vapor ◽  
Composite Film ◽  
Water Absorption ◽  
Composite Films ◽  
Thermoplastic Starch ◽  
Light Transmittance ◽  
Infrared Spectrometry ◽  
Nano Zno

Composite films of polybutylene adipate terephthalate (PBAT) were prepared by adding thermoplastic starch (TPS) (TPS/PBAT) and nano-zinc oxide (nano-ZnO) (TPS/PBAT/nano-ZnO). The changes of surface morphology, thermal properties, crystal types and functional groups of starch during plasticization were analyzed by scanning electron microscopy, synchronous thermal analysis, X-ray diffraction, infrared spectrometry, mechanical property tests, and contact Angle and transmittance tests. The relationship between the addition of TPS and the tensile strength, transmittance, contact angle, water absorption, and water vapor barrier of the composite film, and the influence of nano-ZnO on the mechanical properties and contact angle of the 10% TPS/PBAT composite film. Experimental results show that, after plasticizing, the crystalline form of starch changed from A-type to V-type, the functional group changed and the lipophilicity increased; the increase of TPS content, the light transmittance and mechanical properties of the composite membrane decreased, while the water vapor transmittance and water absorption increased. The mechanical properties of the composite can be significantly improved by adding nano-ZnO at a lower concentration (optimum content is 1 wt%).

Preparation and characterization of surface modified boron nitride epoxy composites with enhanced thermal conductivity

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 44282-44290 ◽  
Author(s):  
Jun Hou ◽  
Guohua Li ◽  
Na Yang ◽  
Lili Qin ◽  
Maryam E. Grami ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Boron Nitride ◽  
High Thermal Conductivity ◽  
Epoxy Composites ◽  
Surface Modified ◽  
Enhanced Thermal Conductivity ◽  
Electrical Insulation Properties

The fabricated surface modified boron nitride epoxy composites exhibit high thermal conductivity, superior thermal stability and good mechanical properties while retaining good electrical insulation properties.

A comparative study performance of cationic organic montmorillonite prepared by different methods

2018 ◽  
Vol 25 (1) ◽  
pp. 53-58 ◽  
Author(s):  
Daojin Zhou ◽  
Zepeng Zhang ◽  
Jialun Tang ◽  
Sanqin Wu ◽  
Jiali Zhao
Keyword(s):  
Thermal Stability ◽  
Contact Angle ◽  
Comparative Study ◽  
Environment Friendly ◽  
Organic Montmorillonite ◽  
Loop Area ◽  
Structures And Properties ◽  
Swelling Capacity ◽  
Study Performance

AbstractIn this paper, cationic organic montmorillonites (OMts) were prepared by dry, semi-dry, and wet methods. The structures and properties of these OMts according to the modification methods were studied. By the characterization of XRD, TG-DTA, lipophilicity, and thixotropy, the results showed that cationic OMt prepared by wet method with sufficient surfactants had better properties, including contact angle, swelling capacity, thixotropic loop area, and thermal stability compared with cationic OMt prepared by dry and semi-dry methods. Attention should be paid that with low ratio amount of surfactants used, cationic OMt prepared by the semi-dry method had favorable properties compared with cationic OMt prepared by wet method, and it had the potential to be applied in industrial field due to its environment-friendly and modification efficiency characteristics.

Characterization of kaolinite/styrene butadiene rubber composite: Mechanical properties and thermal stability

2016 ◽  
Vol 124-125 ◽  
pp. 167-174 ◽  
Author(s):  
Yinmin Zhang ◽  
Qinfu Liu ◽  
Shilong Zhang ◽  
Yude Zhang ◽  
Yongfeng Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Composite ◽  
Styrene Butadiene

scholarly journals DEVELOPMENT AND CHARACTERIZATION OF POLY(OXY-1,4-PHENYLENESULFONYL-1,4-PHENYLENE) FOR PROTON EXCHANGE MEMBRANES

2021 ◽  
pp. 1-7
Author(s):  
ANDRÉS PACHECO LANCHEROS ◽  
AURA LOMBANA PUERTA ◽  
ÁLVARO REALPE JIMÉNEZ ◽  
DINA MENDOZA BELTRAN ◽  
MARÍA TERESA ACEVEDO MORANTES
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Fuel Cell ◽  
Water Absorption ◽  
High Performance ◽  
Low Cost ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Cell Technology

Proton Exchange Membranes (PEMs) are materials developed with a focus on high-performance, low-cost features to achieve promising fuel cell technology in stationary, portable, and transportation facilities. In this study, we synthesized membranes from Poly (oxy-1,4-phenylenesulfonyl-1,4-phenylene) (PES) sulfonated with modification by adding nanoclay to improve the mechanical properties of PEMs. The sulfonation time and the concentration of nanoclays directly favored properties such as contact angle, water absorption, porosity, and mechanical properties. However, a higher concentration of nanoclays (e.g., 10% by weight) damages the mechanical properties of PES membranes specifically. The membrane with 5% by weight of nanoclay and a sulfonation time of 2 h achieved the best performance.

scholarly journals Synthesis and Characterization of Biodegradable Polyester/Polyether WPU As The Environmental Protection Coating

2021 ◽  
Author(s):  
Guangfeng Wu ◽  
Xin Song ◽  
ZhiHui Yang ◽  
Ying Chun Li ◽  
HuiXuan Zhang
Keyword(s):  
Thermal Stability ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Degradation Rate ◽  
Soft Segment ◽  
Buffer Solution ◽  
Water Contact ◽  
Elongation At Break ◽  
Protection Coating

Abstract Polyester diol PCL and PBA, polyether diol PTMG and polycarbonate diol PCDL were used as components of WPU soft segment, respectively. Polyether PTMG-WPU has the worst hydrolytic property and the highest thermal stability. The maximum degradation rate temperature Tmax is 407.8°C, the water contact angle reaches 89.5°. Traditional polyester PCL-WPU shows the strongest hydrolysis performance, the smallest water contact angle, only 71.7°, the water absorption rate of 72 hours at room temperature is as high as 26.7%. However, the thermal stability of PCL-WPU is lower, the soft segment Tg is -52.3°C, and Tmax is only 333.7°C, but the mechanical propertie of which is the best, the tensile strength is 58.3 MPa, and the elongation at break reaches 857.9%. The most important thing is that the structure of polyester PCL-WPU is more easily destroyed by lipase and water molecules. The acidic products produced after hydrolysis will further promote the degradation of polyester. Therefore, compared with other WPUs, PCL -WPU has the best biodegradability and the most obvious degradation effect under the same conditions. The degradation rate of PTMG-WPU after 30 days of degradation in 0.6% lipase PBS buffer solution and soil was only 4.2% and 2.3%, while the highest degradation rate of traditional polyester PCL-WPU reached 41.7% and 32.0%, respectively. In addition, polycarbonate PCDL-WPU has the highest hardness, reaching 95.5 HD. But its other performances are lower than PCl-WPU.

Synthesis and characterization of a phosphorus-containing flame retardant with double bonds and its application in bismaleimide resins

RSC Advances ◽  
2015 ◽  
Vol 5 (123) ◽  
pp. 101480-101486 ◽  
Author(s):  
Song Li ◽  
Hongxia Yan ◽  
Shuyao Feng ◽  
Song Niu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Synthesis And Characterization ◽  
Bismaleimide Resin ◽  
Phosphorus Containing ◽  
Reactive Phosphorus ◽  
Bismaleimide Resins

A novel reactive phosphorus-containing flame retardant was synthesized and used to modify bismaleimide resin. According to investigations, the modified bismaleimide resin has good mechanical properties, thermal stability and flame retardancy.

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