• Title/Summary/Keyword: polyvinylchloride(PVC)

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Cost-effective polyvinylchloride-based adsorbing membrane for cationic dye removal

  • Namvar-Mahboub, Mahdieh;Jafari, Zahra;Khojasteh, Yasaman
    • Membrane and Water Treatment
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    • v.11 no.2
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    • pp.131-139
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    • 2020
  • The current study focused on the preparation of low-cost PVC-based adsorbing membrane. Metakaolin, as available adsorbent, was embedded into the PVC matrix via solution blending method. The as-prepared PVC/metakaolin mixed matrix membranes were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, atomic force microscopy (AFM), pure water permeability and contact angle measurements. The results confirmed the improvement of PWP and hydrophilicity due to the presence of metakaolin in the PVC matrix. Additionally the structure of PVC membrane was changed due to the incorporation of metakaolin in the polymer matrix. The static adsorption capacity of all samples was determined through dye removal. The effect of metakaolin dosage (0-7%) and pH (4, 8, 12) on dye adsorption capacity was investigated. The results depicted that the highest adsorption capacity was achieved at pH of 4 for all samples. Additionally, adsorption data were fitted on Langmuir, Freundlich, and Temkin models to determine the appropriate governing isotherm model. Finally, the dynamic adsorption capacity of the optimum PVC/metakaolin membrane was studied using dead-end filtration cell. The dye removal efficiency was determined for pure PVC and PVC/metakaolin membrane. The results demonstrated that PVC/metakaolin mixed matrix membrane had a high adsorption capacity for dye removal from aqueous solution.

Triboelectrostatic Separation of PVC Materials from Mixed Plastics for Waste Plastic Recycling

  • Lee, Jae-Keun;Shin, Jin-Hyouk;Ku, Jae-Hyun;Kim, Doo-Hyun;Cho, Jae-Min;Hwang, Yu-Jin
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.597-601
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    • 2001
  • Waste plastics amount is more than 3.5 million tons and 30% of industrial waste in 1998, Korea but recycling rate of industrial waste plastics is quite low because the material separation technology from the mixed waste plastic powders is not commercially available so far. This study covers the triboelectrostatic separation of polyvinylchloride (PVC) materials collection chambers and controllers. PVC and PET powders can be imparted negative and positive surface charges, respectively, due to the difference of triboelectric charging series between particles and particles in the fluidized bed tribocharger, and can be separated by passing them through an external electric field. The extract content and yield of PVC separation from the mixed PVC and PET plastic powders are 90.0% and 98.2%, respectively. The electrostatic separation system using the fluidized bed tribocharger shows the potential to be an effective method for removing PVC materials from other mixed plastics.

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The Relationship Between the Permeation Rate and the Solubility Parameter for Polyethylene-n-Hexane-Benzene System in Pervaporation (폴리에틸렌-n-헥산-벤젠계에 대한 투과속도와 용해도 파라메타 사이의 관계)

  • Rhim, Ji-Won
    • Membrane Journal
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    • v.3 no.3
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    • pp.136-139
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    • 1993
  • It is well known that the membrane permeation in pervaporation is governed by both the chemical nature of the membrane material and the physical structure of the membrane and also the separation can be achieved by differences in either solubility, size or shape. The solubility of the penerrant in the polymeric membrane can be described qualitively by applying the Hildebrand relation [1] which relates the energy of mixing of the penerrant and the polymer material. Froehling et al. have tried to predict the swelling behavior of polymers for the systems of polyvinylchloride(PVC)-toluene-methanol, PVC-trichloroethylene-nitromethane and PVC-n-butylacetate-nitromethane[2]. The former two systems which do not show the donor/acceptor interactions upon mixing showed the successful results[2]. In addition to this technique, there are several other possible approaches to predict the swelling behaviors of polymers, such as the surface thermodynamic approach[3, 4], the comparison of the membrane polarity with the solvent polarity in terms of Dimroth's solvent polarity value[5].

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Effect of Synthetic Resin Container on the Stability of FAD Solution (합성수지 용기가 FAD 수용액의 안정성에 미치는 영향)

  • 이계주;유병설
    • YAKHAK HOEJI
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    • v.23 no.3_4
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    • pp.147-152
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    • 1979
  • Experiments were carried out to investigate for the interaction between FAD solution and synthetic resin containers made of polyvinylchloride(PVC), polyethylene(PE), and polycarbonate(PC), and for the effect of glycyrrhizine or malic acid on stabilization of FAD in aqueous solution by accelerated stability analysis. Analysis of FAD was determined by means of spectrometer and by separating by paper chromatography and metal ions were detected by atomic absorption spectrophotometer, which were extracted from containers by means of Food and Additive Regulation Standard. The thermal decomposition of FAD in aqueous solution was pseudo first order reaction and it was inhibited by adding glycyrrhizine or malic into the solution. PVC, PE and PC containers accelerated the decomposition of FAD in solution. It is assumed that bivalent heavy metals in resin containers may catalize the hydrolysis of FAD. The metals detected from the containers were Ca, Zn, Cu, Fe, Pb and Cd. And the total amounts of detected metals from PVC were 6.2mcg/cm$^{2}$, PE, 5.5mcg/cm$^{2}$, and PC, 2.7mcg/cm$^{2}$ which were proportional to the rate constant of FAD decomposition in aqueous solution.

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Preparation and Properties of Sulfonated Polyvinylchloride (PVC) Membrane for Capacitive Deionization Electrode by Ultra Sonication Modification (초음파 표면개질에 의한 CDI 전극용 술폰화 염화비닐(PVC) 멤브레인의 제조 및 특성)

  • Hwang, Chi Won;Oh, Chang Min;Hwang, Taek Sung
    • Journal of Adhesion and Interface
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    • v.15 no.1
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    • pp.1-8
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    • 2014
  • Ion exchange membrane is widely used in various fields such as electro dialysis, diffusion dialysis, redox flow battery, fuel cell. PVC cation exchange membrane using ultrasonic modification was prepared by sulfonation reaction in various sulfonation times. Sulfuric acid was used as a sulfonating agent with ultrasonic condition. We've characterized basic structure of sulfonated PVC cation exchange membrane by FT-IR, EDX, water uptake, ion exchange capacity (IEC), electrical resistance (ER), conductivity, ion transport number and surface morphology (SEM). The presence of sulfonic groups in the sulfonated PVC cation exchange membrane was confirmed by FT-IR. The maximum values of water uptake, IEC, electrical resistance and ion transport number were 40.2%, 0.87 meq/g, $35.2{\Omega}{\cdot}cm^2$ and 0.88, respectively.

Phase Separation Structure of (PVC/Liquid Crystal) Composite Membrane ((Polyvinylchloride/액정) 복합막의 상분리 구조)

  • 이미선;최성부;이한섭;박관선;김병식
    • Proceedings of the Membrane Society of Korea Conference
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    • 1998.04a
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    • pp.68-69
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    • 1998
  • 1. 서론 : 고분자/액정 복합막은 액정의 높은 분자운동성이 물질의확산에 기여하여 우수한 투과성을 나타낸다. 이 막은 3차원의 망상구조를 갖는 매트릭스 고분자내에 액정이 연속상으로 안정하게 분산된 상분리 구조를 가지고 있다. 이 복합막은 그러한 상분리 구조에 기인하여 자기지지형(self support LC) 복합막이라고도 한다. 복합막 중에 액정은 탄화수소가스에 대하여 높은 선택성을 나타내어 막속으로 흡착을 촉진하고 액정물질이 결정에서 액정으로 변화는 전이온도에서 투과계수가 100-200 증가한다고 보고하였다. (생략)

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Characteristics of Gas Permeation of Alternative Laminated Membrane Perpared by Water-Casting (수면전개 교대적층막의 기체투과특성)

  • 남석태;최성부;김병식
    • Proceedings of the Membrane Society of Korea Conference
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    • 1991.04a
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    • pp.15-18
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    • 1991
  • 본 연구에서는 박막화를 위한 수면전개법을 이용하여 기체분리능을 향상시키기 위한 복합막을 개발하고자 수면전개 적층복합막을 제조하여 기체투과특성실험을 행하였다. 실험에 사용한 고분자재질은 투과성이 우수한 Cellulose Acetate(CA)와 Polystyrene(PS)을, 선택성이 우수한 Polyvinylchloride(PVC)이었다. 이들 막에 대한 적층형태와 방법에 대한 효과를 검토하고 blend막과도 기체투과특성을 비교하였다.

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A Numerical Study on the Triboelectrostatic Separation of PVC Materials From Mixed Plastics for Waste Plastic Recycling

  • Ha, Man-Yeong;Jeon, Chung-Hwan;Park, Doo-Seong;Park, Hae-Jin
    • Journal of Mechanical Science and Technology
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    • v.17 no.10
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    • pp.1485-1495
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    • 2003
  • We investigate the triboelectrostatic separation of polyvinylchloride (PVC) from mixed plastics in the laboratory scale triboelectrostatic separation system. The flow and electric fields in the precipitator are obtained from the numerical solution of finite volume method. Using these flow and electric fields, we solved the particle motion equation considering the inertia, drag, gravity and electrostatic forces acted on the particles. The particle trajectories are obtained using a Lagrangian method as a function of different important variables such as Reynolds number, Stokes number, electrostatic force, electric charge and electric field distribution, inclined angle of plane electrodes, particle rebounding, particle charge decay rate after impact on the electrode surface, etc., in order to determine the optimal design conditions. The present predicted results for the cumulative yield represent well the experimental ones.

A Study on the Separation of Mixed Waste Plastics by Trioboelectrification (마찰대전을 이용한 혼합폐플라스틱 분리에 관한 연구)

  • Lee, Jong-Ho;Shin, Jin-Hyuk;Kim, Doo-Hyun;Kim, Jang-Woo;Lee, Jae-Keun
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.538-543
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    • 2000
  • The purpose of this study is to develope electrostatic separation system for recycling of mixed waste plastics. The electrostatic separation system is designed and investigated the separation efficiency for separating of mixed waste plastics. Electrostatic separation system consisted of a tribocharger, separator (two electrode), collector (5 tray) and controller (positive/negative high voltage power supply). The tribocharger is a fluidized bed using tribo-electrification mechanism between particles and particles. In experimental results, the tribocharger of the fluidized bed was more effective separation efficiency. It showed the purity of $85{\sim}99\;%$ and the recovery of $80{\sim}98\;%$ from the powder of mixed plastics such as LDPE, HDPE, PP, PS, PET and PVC. Especially, In the separation experiment of Polyvinylchloride(PVC) which generates hazardous hydrogen chloride gas in case of the combustion. its purity was over 99 % and recovery was over 95 %.

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Polyvinylchloride Plasticized with Acetylated Monoglycerides Derived from Plant Oil (아세틸화 모노글리세라이드계 가소제 합성 및 PVC 가소성능에 관한 연구)

  • Lee, Sangjun;Yuk, Jeong-Suk;Kim, A-Ryeon;Choung, Ji Sun;Shin, Jihoon;Kim, Young-Wun
    • Applied Chemistry for Engineering
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    • v.28 no.1
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    • pp.42-49
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    • 2017
  • To replace phthalate plasticizer for PVC, acetylated monoglyceride (AMG) plasticizers were prepared from plant oil and their plasticization effects were also investigated. Transesterification of coconut oil by glycerol followed by acetylation with acetic anhydride gave AMG-CoCo (Coco : Coconut Oil). In addition, AMG-GMO (GMO : Glycerol monooleate) and AMG-GMO-Epoxy were synthesized by acetylation and epoxidation with glycerol monooleate. It was found that the thermal stability of AMG plasticizers increased in the following order: AMG-GMO-Epoxy > AMG-GMO > AMG-CoCo and all three plasticizers were thermally more stable than those of common petroleum-based plasticizer DOP (Dioctyl phthalate). The tensile strain values of the PVC containing AMG compounds were ca. 770~810%, while tensile strength values were ca. 19~22 MPa, which were higher than those of PVC containing DOP. DMA (Dynamic Mechanical Analysis) results showed that the miscibility of AMG-GMO-Epoxy in PVC was excellent and the $T_g$ of PVC containing AMG-GMO-Epoxy at 50 phr decreased down to $24^{\circ}C$. Finally, the leaching experiment result showed that the weight loss values of PVC containing AMG-GMO and AMG-GMO-Epoxy at 50 phr were as low as 2 and 1%, respectively, indicating that they have high water migration resistance. The above findings suggested that AMG-GMO-Epoxy could be one of plant oil-based PVC plasticizers to replace DOP.