• Title/Summary/Keyword: Polymer curing

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The Effect of Curing condition on Adhesion in Tension of Polymer-Modified Mortars (양생존건이 폴리머 시멘트 모르터의 접착강도에 미치는 영향)

  • 전우성;조영국;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.349-356
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    • 1997
  • The purpose of this study is to evaluate the effect of curing conditions on adhesion in tension of polymer-modified mortar to cement mortar substrate in comparision with ordinary cement mortar. The polymer-modifies mortars using two polymer dispersions and a redispersible polymer power are prepared with various polymer-cement ratios, and tested for the adhesion in tension of the specimens subjected to five curing conditions. From the test results, the adhesion in tension of polymer-modified mortars tends to increase with increasing polymer-cement ratio irrespective of the polymer types and curing conditions. It is apparent that adhesion in tension of polymer-modified mortars is considerably influenced by curing conditions.

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Evaluation for Performance According to Curing Method of Polymer- Modified Mortars (폴리머 시멘트 모르타르의 양생방법에 따른 물성 평가)

  • Park, Hun-Il;Ryu, Byung-Cheoll;Oh, Sang-Keun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.273-276
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    • 2005
  • Polymer-modified mortar was developed for improving the performance of modified mortar which is mixed with polymer, and it is used for protecting and repairing materials of building because of their excellent performance to improve characteristics which are compressive strength, flexural strength, and adhesive strength. However, the performances of the polymer-modified mortars are highly affected by materials, which are polymer, mortar, and aggregates, and conditions which are curing environment and testing method. Furthermore, dry curing method after hydrated curing has been recommended to make strong polymer film for the best curing method to make excellent characteristics. In this report, We investigated the co-relation between curing methods and the characteristics, which are compressive strength, flexural strength, and adhesive strength for the polymer-modified mortars that are used in the domestic area.

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A Study on the Abrasion Resistance of Polymer - Modified Mortar According to Curing Conditions (양생조건에 따른 폴리머 시멘트 모르터의 내마모성에 관한 연구)

  • Jo, Young-Kug;So, Seoung-Young
    • Journal of the Korea Institute of Building Construction
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    • v.5 no.4 s.18
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    • pp.115-120
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    • 2005
  • In recent years, polymer-modified mortars using polymer dispersions have been widely used as finish and repair materials in the construction industry because of their excellent properties compares to those of ordinary cement mortar. Especially, the adhesion improvement of ordinary cement mortar and concrete has attracted a great deal of attention from researchers, and several unique and simply applicable techniques for the adhesion improvement have been developed. The purpose of this study is to evaluate the abrasion resistance of polymer-modified mortar according various curing methods. The polymer-modified mortar are prepared with various polymer-cement ratios, and are subjected to three curing methods such as dry rure, standard cure and freezing and thawing cure after two curing methods, and then tested for abrasion. From the test results, the polymer-modified mortars with various polymer-cement ratios have some superior abrasion resistance compared with plain mortar. The abrasion resistance of polymer-modified mortars increase with an increase in the polymer-cement ratio, and is better under water cure than any other curing methods. It is concluded that the abrasion resistance of cement mortar is markedly improved by modifying of polymer dispersion.

Adhesion in Tension of Polymer-Modified Mortars according to Curing Conditions (양생조건에 따른 폴리머 시멘트 모르타르의 인장접착강도)

  • Jo, Young-Kug
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.200-201
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    • 2018
  • The purpose of this study is to evaluate the adhesion in tension of polymer-modified mortars according to curing conditions. From the test results, the adhesion in tension is seriously affected by type of curing conditions compared with type of polymer dispersions or polymer-cement ratios. The maximum adhesion in tension of EVA-modified mortar with polymer-cement ratio of 20% cured by standard condition is about 1.81 times, the cement mortar cured in water. It is apparent that the adhesion in tension of polymer-modified mortars according to raising of polymer-cement ratio is also much more improved irrespective of type of polymer dispersions and curing conditions.

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Effect of Curing Temperature on Mechanical Properties of Polymer Mortar for Urgent Repairing (양생온도가 긴급 보수용 폴리머 모르타르의 역학적 특성에 미치는 영향)

  • Cho, Yong In;Hong, Ki Nam;Kim, Min Sung;Park, Jae Kyu
    • Journal of the Korean Society of Safety
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    • v.31 no.5
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    • pp.109-116
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    • 2016
  • This study presents the results of experiments to investigate the effect of polymer type and curing temperature on the mechanical properties of polymer mortar. Setting time of two types of polymers, hardening-delayed polymer(HDP) and rapid hardening polymer(RHP), was tested to check the working time. Additionally, flexural strength, compressive strength, and splitting tensile strength was investigated for mortars using these polymers. From these results, it was confirmed that, irrespective to curing temperature, RHP mortar at the curing age of 24h develops the similar mechanical properties to maximum properties and HDP mortar is more sensitive to the curing temperature. In addition, it should be noted that RHP mortar and HDP mortar are suitable in winter and summer, respectively.

Effects of Aggregate and Curing Temperature on Strength Development of UP-MMA based Polymer Mortar under Sub-Zero Temperature (영하온도에서 UP-MMA 폴리머 모르타르의 강도 발현에 미치는 골재 및 양생온도의 영향)

  • Yeon, Kyu-Seok;Kim, Yong-Seong;Cha, Jin-Yun;Son, Seung-Wan
    • Journal of The Korean Society of Agricultural Engineers
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    • v.53 no.5
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    • pp.25-33
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    • 2011
  • In this paper, the effects of aggregate and curing temperature on strength development characteristics of UP (Unsaturated Polyester)-MMA (Methyl Methacrylate) based polymer mortar under sub-zero temperature are experimentally investigated to provide a criterion for repair and production of precast products. The result showed that the setting time of the binder was 4 minutes at $20^{\circ}C$ whereas 35 minutes at $-20^{\circ}C$. The result also revealed that the compressive, flexural, and splitting tensile strengths of UP-MMA based polymer mortar significantly decreased as the aggregate and curing temperatures decreased. However, sufficient strengths which can be implemented in actual practices -36.6 MPa of compressive strength, 6.11 MPa of flexural strength, and 5.81 MPa of splitting tensile strength - were obtained even though both aggregate and curing temperatures were $-20^{\circ}C$. Strength development of polymer mortar is largely affected by curing temperature rather than aggregate temperature. It was found that the effects of aggregate temperature on strength development become smaller as the curing temperature becomes lower. Also, toughness, a ratio of compressive strength to flexural strength, increased from 3.5 to 5.9 as both aggregate and curing temperatures decreased from $20^{\circ}C$ to $-20^{\circ}C$.

Electron Beam Curing of Hard Coating Resin for In-mold Decoration Foils (In-mold Decoration 포일에 사용되는 경질 코팅 수지의 전자빔 경화)

  • Sim, Hyun-Seog;Yun, Deok-Woo;Kim, Geon-Seok;Lee, Kwang-Hee;Lee, Byung-Cheol
    • Polymer(Korea)
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    • v.35 no.2
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    • pp.141-145
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    • 2011
  • The electron beam (EB) induced curing of a typical resin designed for the hard coating layer of in-mold decoration foils was investigated. The samples were irradiated with different doses of EB and the curing reaction was monitored by Fourier transform infrared (FTIR) spectroscopy. The change in coating properties such as surface hardness and anti-abrasion property was studied as a function of increasing dose. The effect of the addition of nano-particles on the improvement of coating properties was also examined. It was expected that the experimental results could be used for the commercial exploitation of the EB curing system comparable to the ultraviolet (UV) curing system.

Study on Initial Scattering State as a Function of Curing Temperature for Polymer Dispersed Liquid Crystal Cells with Different Mixing Ratio (고분자 분산형 액정 셀에서 혼합물의 비율에 따라 노광 온도가 초기 산란도에 미치는 영향)

  • 김미숙;서영현;이명훈;이종문;이택수;이승희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.1
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    • pp.59-64
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    • 2004
  • We have fabricated the polymer dispersed liquid crystal (PDLC) cell where a control of phase separation is very important. The factors to influence the phase separation are mixing ratio of LC and polymer, curing temperature and UV intensity. In this paper, we inspected the change of a phase separation as a function of curing temperature for the mixture of E7 and. NOA65 with different ratios. When the LC concentration is less than polymer such as LC:NOA65 = 40:60wt%, the PDLC cell is influenced strongly by the curing temperature. However, when the LC concentration is much less than polymer such as LC:NOA65 = 80:20wt%, it is influenced slightly by the curing temperature. The reason is because the mixture shows upper critical solution temperature behavior and therefore it is important to know the behavior of phase separation as a function of curing temperature of the mixture.

New Bio-based Polymeric Materials from Plant Oils

  • Uyama, Hiroshi
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.359-359
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    • 2006
  • This study deals with development of new bio-based polymeric materials from epoxidized soybean oil (ESO). The curing of ESO in the presence of organophilic montmorillonite produced an oil polymer-clay nanocomposite ("green nanocomposite") showing flexible property. A green nanocomposite (oil polymer-silica nanocomposite) coatings were synthesized by an acidcatalyzed curing of ESO with 3-glycidoxypropyltrimethoxysilane. The curing of ESO in the presence of a biodegradable plastic, poly(caprolactone), produced a composite with semi-IPN structure. The mechanical properties of the composite was much superior to those of polyESO. These new oil-based materials have large potential for applications in various fields.

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Effects of Curing Temperature on Early Strength of Polymer Concrete (폴리머 콘크리트의 초기강도에 미치는 양생온도의 영향)

  • 연규석;김광우;이봉학
    • Proceedings of the Korea Concrete Institute Conference
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    • 1990.10a
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    • pp.151-156
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    • 1990
  • This is an experimental study to investigate chante of early strength of polymer concrete due to curing temperature change. Polymer binders that were used in the experiment include 2 types of epoxy system and 4 types of polyester system which are commercially producer in Korea. The study result showed that there was a difference in early strength by curing temperature. At $35^{\circ}C$ which is a higher than normal curing temperature, higher strengths were developed in polymer concretes prepared with KB-Clear and YD-128 of epoxy system, and G-550 and H-660 of polyester system. However, at the same temperature, reduced strengths were obtained for FH-103 and TR-132 of polyester system. Further study under various curing conditions with humidity and temperature change will warrant more generalized result.

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