• Title/Summary/Keyword: terpolymer powder

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Performance Evaluation of Prepackaged-Type Low Shrinkage Surface Preparation Materials Using a VA/E/MMA Terpolymer Powder

  • Hong, Sun-Hee;Kim, Wan-Ki
    • Journal of the Korea Institute of Building Construction
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    • v.12 no.1
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    • pp.64-72
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    • 2012
  • Recently, prepackaged-type surface preparation materials using redispersible polymer powders are widely used for interior and exterior finishing in the construction work. The purpose of this study is to evaluate the performance and the quality of prepackaged-type surface preparation materials using a VA/E/MMA terpolymer powder. Surface preparation materials using a VA/E/MMA terpolymer powder were prepared with shrinkage reducing agent contents of 0, 4 % and cellulose fiber contents of 0, 0.5, 1.0 %, and tested for drying shrinkage, strengths, adhesion in tension, crack and impact resistance, water absorption, permeability. As a result, prepackaged-type surface preparation materials show outstanding performance depending on the shrinkage reducing agent and cellulose fiber contents.

Self-Corrosion Protection of Polymer Cementitious Materials Using Terpolymer Powders with a Nitrite-type Hydrocalumite (아질산형 hydrocalumite와 터폴리머 분말수지를 병용한 폴리머 시멘트계 재료의 자기방청기능)

  • Hong, Sun-Hee;Kim, Wan-Ki
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2010.05a
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    • pp.73-76
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    • 2010
  • This study deals with the properties of polymer-modified mortars with a nitrite-type hydrocalumite, which are effectively used as intelligent patch materials for deteriorated reinforced concrete structures. The calumite is a material that can adsorb the chloride ions (Cl-) causing the corrosion of reinforcing bars and liberate the nitrite ions (NO2-) inhibiting the corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. Polymer-modified mortars using hydrocalumite and terpolymer powders are prepared with various calumite contents and polymer-binder ratios, and tested for corrosion inhibition. Subsequently, regardless of the polymer-binder ratio, the replacement of ordinary portland cement with the calumite has a marked effect on the corrosion-inhibiting property of the polymer-modified mortars.

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Corrosion Protection of Rebars Using High Durability Polymer Cementitious Materials for Environmental Load Reduction (환경부하저감형 고내구성 폴리머 시멘트계 재료를 이용한 철근 부식저감기술)

  • Kim, Wan-Ki;Chung, Seung-Jin
    • KIEAE Journal
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    • v.10 no.5
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    • pp.131-137
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    • 2010
  • The building industry must aim at high-durability and sustainability. A holistic life cycle based approach is recommended to reduce the environmental load. In recent years, technical innovations in the construction industry have advanced to a great extent, and caused the active research and development of high-performance and multifunctional construction materials. Nowadays, various polymer powders have been commercialized to manufacture construction materials in the form of prepackaged-type products, which have rapidly been developed for lack of skilled workmen in construction sites. Recently, terpolymer powders of improved quality have been developed and commercialized as cement modifiers. And, hydrocalumite is a material that can adsorb the chloride ions (Cl-) causing the corrosion of reinforcing bars and liberate the nitrite ions (NO2-) inhibiting the corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. The purpose of this study is to ascertain the self-corrosion inhibition function of polymer-modified mortars using redispersible powders with hydrocalumite. Polymer-modified mortars using VA/E/MMA and VAE redispersible powders are prepared with various calumite contents and polymer-binder ratios, and tested for chloride ion penetration depth, corrosion inhibition. As a result, regardless of the polymer-binder ratio, the replacement of ordinary portland cement with hydrocalumite has a marked effect on the corrosion-inhibiting property of the polymer-modified mortars. Anti-corrosion effect of polymer-modified mortars using VA/E/MMA terpolymer powder with hydrocalumite is higher than that of VAE copolymer powder.

Study on the Functionalization of Waste EPDM and PP Blend

  • Chung, Kyungho;Kim, Jinhee
    • Elastomers and Composites
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    • v.50 no.4
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    • pp.245-250
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    • 2015
  • Recycling of ethylene-propylene-diene terpolymer (EPDM) scrap was tried by blending with polypropylene (PP). EPDM scrap powder was prepared by shear pulverization process at high temperature, which may lead to selective chain scission induced by difference in the critical elastic coefficient. On the other hand, EPDM scrap powder was prepared by adding a selected reclaiming agent during shear pulverization process at high temperature. Terpene as a bonding agent was then introduced to improve adhesion property. PP, used as a matrix for manufacturing thermoplastic elastomer, was modified by the incorporation of dicumyl peroxide and maleic anhydride. The functionalized EPDM and modified PP were blended and cured dynamically at $190^{\circ}C$. The blend materials prepared in this study showed the comparable results to those of conventional TPE in terms of tensile and flow properties. Also, the odor component of recycled EPDM was analyzed using GC-MS.

A Basic Study on the Self-Corrosion Inhibition Function Identification of VA/E/MMA-Modified Mortar with Nitrite-Type Hydrocalumite (칼루마이트 및 VA/E/MMA 분말수지 병용 PMM의 자기방청기능 규명을 위한 기초적 연구)

  • Hong, Sun-Hee;Kim, Wan-Ki
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.253-254
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    • 2011
  • The purpose of this study is to investigate chloride ion adsoption property of cement mortar using nitrite type hydrocalumite(calumite) with self-corrosion inhibition function. Superior corrosion inhibition function of the VA/E/MMA-modified mortars with calumite was ascertained from accelerated corrosion test in the previous study. In this study, VA/E/MMA-modified mortars with calumite were prepared with calumite contents of 0, 5, 10% and polymer-binder ratio of 0, 10%, and tested for chloride ion adsorption to make it clear how calumite gives self-corrosion inhibition function to cement mortar. As a result, chloride ion adsorption property of VA/E/MMA-modified mortars with calumite was improved by increasing calumite contents compared to unmodified mortar regardless of using VA/E/MMA terpolymer powder or not.

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Structural Effects on the Tensile and Morphological Properties of Zeolite-filled Polypropylene Derivative Composites

  • Jagannath, Jagannath Biswas;Kim, Hyun;Yim, Chai-Suk;Cho, Jungh-Wan;Kim, Geon-Joong;Choe, Soon-Ja;Lee, Dai-Soo
    • Macromolecular Research
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    • v.12 no.5
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    • pp.443-450
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    • 2004
  • We have studied the effects that inorganic zeolite powder have on structurally different copolymer [poly(propylene-co-ethylene)] and terpolymer [poly(propylene-co-ethylene-co-l-butene)] systems and the possibility of preparing suitable porous composite films. The impact strength and yield stress of the composites did not improve upon any further loading of zeolite, but the modulus increased gradually with respect to the filler loading. The experimental modulus of each of the two systems was compared with theoretical models. We performed a morphological study of the filler mixing efficiency and image analysis. The number-, weight-, and z-average air hole diameters were compared with respect to the draw ratio as well as the zeolite loading. The experimental results suggest that these two matrices can provide a new choice for preparing future multiphase polymeric porous films by stretching them unidirectionally. In particular, we suggest that a 40 wt% zeolite loading at a draw ratio of 4 is useful for porous film applications.