• Title/Summary/Keyword: unsaturated polyester resin

Search Result 133, Processing Time 0.04 seconds

An Experimental Study on Toughening of Unsaturated Polyester Mortar Using Polyuretane Liquid Rubber (폴리우레탄 액상고무를 이용한 불포화 폴리에스테르 모르터의 인성개선에 관한 실험 연구)

  • 박준철;배근철;박준호;최영준;김화중
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2001.05a
    • /
    • pp.371-376
    • /
    • 2001
  • The purpose of this study is to investigate toughening of unsaturated polyester resin by addition of polyuretane liquid rubber. In general, unsaturated polyester resin has strong brittleness in spite of its high strength Therefore; it is difficult to use unsaturated polyester mortar for the place where impact resistance is demanded. In this study, it was evaluated strength and Gf by using to polyurethane liquid rubber. As a result, the toughness of unsaturated polyester mortar was increased by polyuretane liquid rubber.

  • PDF

Matrix Resin Systems with Different Molar Ratios to Improve the Properties of Fiber-reinforced Composites (섬유강화 복합재료의 물성향상을 위한 몰비가 다른 매트릭스 수지에 관한 연구)

  • 이상효;이장우
    • Polymer(Korea)
    • /
    • v.24 no.4
    • /
    • pp.459-468
    • /
    • 2000
  • To improve the mechanical properties of fiber-reinforced polymer matrix composites, laminated composites plates were fabricated using different matrix resins and glass or aramid fibers. The effect of matrix resin system were evaluated by tensile, flexural strength measurements. In the case of surface treated aramid fiber and unsaturated polyester resin composite, maximum flexural properties were observed in the composite prepared from the glass fiber treated with 0.5 wt% silane coupling agents. Vinylester resin composites show the highest tensile properties and isophthalic polyester composites have the highest flexural properties among the unsaturated polyester resin composites studied. The relationship between overlap laminated composites plates and mechanical properties of polymer composites is also investigated in order to improve mechanical properties of glass fiber and unsaturated polyester resin composites.

  • PDF

Prediction of Compressive Strength of Unsaturated Polyester Resin Based Polymer Concrete Using Maturity Method (성숙도 방법을 이용한 불포화 폴리에스터 수지 폴리머 콘크리트의 압축강도 예측)

  • Choi, Ki-Bong;Jin, Nan Ji;Lee, Youn-Su;Yeon, Kyu-Seok
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.59 no.6
    • /
    • pp.19-27
    • /
    • 2017
  • This study investigated to predict the compressive strength of unsaturated polyester resin based polymer concrete using the maturity method. The test results show that the development of the compressive strength increased exponentially until an age of 24 hours. After 24 hours, the development of the compressive strength just increased gradually. This test result shows that the strength of unsaturated polyester resin based polymer concrete was developed mainly at the early age. Estimated datum temperature of unsaturated polyester resin based polymer concrete was $-20.67^{\circ}C$ which was much lower than of datum temperature ($-10^{\circ}C$) of Portland cement concrete. Also, this study result shows that the existing maturity index associated with Portland cement concrete was not applicable for polymer concrete because curing time of Portland cement concrete is different clearly with curing time of polymer concrete. The cause of different curing time was that there were different curing mechanisms between Portland cement concrete and polymer concrete. In order to best apply the experimental data to a model, CurveExpert Professional, the commercial software, was used to determine the predictive model regarding the compressive strength of unsaturated polyester resin based polymer concrete. As a result, Gompertz Relation or Weibull Model was an appropriate model as a predictive model. The proposed model can be used to predict the compressive strength, especially, it is more useful when the maturity is in the range between $40^{\circ}C{\cdot}h^{0.4}$ and $900^{\circ}C{\cdot}h^{0.4}$.

Strength Properties of MMA-Modified Unsaturated Polyester Mortar (MMA 개질 불포화 폴리에스터 모르타르의 강도 특성)

  • Yeon, Kyu-Seok;Jo, Kyu-Woo;Choi, Jong-Yun;Jeong, Jung-Ho
    • Proceedings of the Korean Society of Agricultural Engineers Conference
    • /
    • 2003.10a
    • /
    • pp.379-382
    • /
    • 2003
  • In this study, methyl methacrylate (MMA)- modified unsaturated polyester mortar, in which the MMA was added to the unsaturated polyester resin, was developed for improving the early-age strength and the workability of the conventional polymer concrete, binder of which was the unsaturated polyester resin. Then the strength properties of the MMA-modified unsaturated polyester mortar were surveyed. The experimental results showed that early-age strength was greater when the MMA contents were increased in the range of $20{\sim}40%$, but the strength rather showed a tendency of decrease when the MMA contents was 50%.

  • PDF

Fire Characteristics Comparison of Resol-type Phenolic Resin for Interial Materials of Passenger Train (철도차량용 레졸계 페놀수지의 내열특성 비교)

  • Lee Cheul-kyu;Lee Duck Hee;Jung Woo Sung
    • Proceedings of the KSR Conference
    • /
    • 2004.06a
    • /
    • pp.277-283
    • /
    • 2004
  • The time to ignition, heat release rate characteristics and carbon monoxide yield of fiber reinforced and sandwich phenol resin were investigated with cone calorimeter. The fire characteristics of unsaturated polyester, mostly being applied to the existing passenger train, and phenolic resin were compared. Thermal gravimetric analysis(TGA) was used to monitor the degree of thermal decomposition for the phenolic resin. According to the cone calorimeter data, the time to ignition, heat release rate and CO yield was faster and higher as the external heat flux increase. Under the same heat flux, the time to ignition of sandwich type phenolic resin was shorter than that of fiber reinforced. The result of comparison between unsaturated polyester and phenolic resin was that phenolic resin was shown to have better fire resistance than that of unsaturated polyester.

  • PDF

Effects of Fillers on Mixing and Mechanical Properties of Polymer Concrete (충진재가 폴리머 콘크리트의 배합과 역학적 성질에 미치는 영향)

  • 연규석;김광우;김기성;김관호
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.35 no.2
    • /
    • pp.81-91
    • /
    • 1993
  • This study was performed to evalute effects of fillers on the mixing characteristics and mechanical properties of polymer concrete. Two types of unsaturated polyester polymer and two types of epoxy resin were used as binder material, and the portland cement, a fly ash and heavy calcium carbonate were used as filler. Following conclusions were drawn from the research results. 1. Working life of polymer concrete was not affected by filler types, but affected significantly by polymer types and quantities of hardener and catalysts. 2. Without concerning polymer types, use of heavy calcuim carbonate as filler was the best in improving workability.3. The highest strength was achieved by heavy calcium carbonate in using unsaturated polyester resin and by fly ash in using epoxy resin type.4. Elastic modulus was in the range of 2.05X 10-5~2.6X 10-5gf/cm$^2$, which was approximatly 60% of that of cement concrete. Heavy calcium carbonate with unsaturated polyester resin and fly ash with epoxy resin showed relatively higher elastic modulus.

  • PDF

Hot Water Resistance of Polymer Mortar Composites Depending on Unsaturated Polyester Resin Types (불포화폴리에스테르 수지의 형태에 따른 폴리머 모르타르 복합재료의 내열수성)

  • Hwang, Eui-Hwan;Song, Min-Kyu;Kim, Yong-Yeon
    • Applied Chemistry for Engineering
    • /
    • v.29 no.2
    • /
    • pp.201-208
    • /
    • 2018
  • The ortho- and iso- type unsaturated polyester resins were synthesized and used as a polymer binder of the polymer mortar composite. Styrene monomer and acrylonitrile were used as a diluent for the unsaturated polyester resin. Methyl ethyl ketone peroxide (MEKPO) and cobalt octoate (CoOc) were used as a curing agent and an accelerator, respectively. Four kinds of unsaturated polyester resins were prepared according to types of the resin and diluent, and used as a polymer binder in the preparation of the specimen. A total of 16 polymer mortar specimens were prepared according to the added amount of the polymer binder and subjected to a hot water resistance test, followed by compressive and flexural strength tests, and pore and SEM analyses. As a result, it was found that the strength of the specimen using the iso-type unsaturated polyester resin as the polymer binder was better than that of using the ortho-type unsaturated polyester resin. The total pore volume and diameter measured after the hot water resistance test were reduced compared to the values before the test. In the micrographs observed before the hot water resistance test, the polymer binder, filler and fine aggregate were firmly combined to the co-matrix, but the polymer binder was mostly decomposed in the micrographs observed after the test.

Fabrication and Electrical, Thermal and Morphological Properties of Novel Carbon Nanofiber Web/Unsaturated Polyester Composites

  • Kim, Seong-Hwan;Kwon, Oh-Hyeong;Cho, Dong-Hwan
    • Carbon letters
    • /
    • v.11 no.4
    • /
    • pp.285-292
    • /
    • 2010
  • Novel unsaturated polyester composites with PAN-based nanofiber, stabilized PAN nanofiber, and carbonized nanofiber webs have been fabricated, respectively, and the effects of the nanofiber web content on their electrical resistivity, the thermal stability, dynamic storage modulus, and fracture surfaces were studied. The result demonstrated that the introduction of just one single layer (which is corresponding to 2 wt.%) of the carbonized nanofiber web to unsaturated polyester resin (UPE) could contribute to reducing markedly the electrical resistivity of the resin reflecting the percolation threshold, to improving the storage modulus, and to increasing the thermal stability above $350^{\circ}C$. The effect on decreasing the resistivity and increasing the modulus was the greatest at the carbonized PAN nanofiber web content of 8 wt.%, particularly showing that the storage modulus was increased about 257~283% in the measuring temperature range of $-25^{\circ}C$ to $50^{\circ}C$. The result also exhibited that the carbonized PAN nanofibers were distributed uniformly and compactly in the unsaturated polyester, connecting the matrix three-dimensionally through the thickness direction of each specimen. It seemed that such the fiber distribution played a role in reducing the electrical resistivity as well as in improving the dynamic storage modulus.

Effect of Nano/micro Silica on Electrical Property of Unsaturated Polyester Resin Composites

  • Sharma, Ram Avatar;D'Melo, Dawid;Bhattacharya, Subhendu;Chaudhari, Lokesh;Swain, Sarojini
    • Transactions on Electrical and Electronic Materials
    • /
    • v.13 no.1
    • /
    • pp.31-34
    • /
    • 2012
  • The addition of nano/micro silica into unsaturated polyester resin (UPR) results in the improvement of the electrical properties of Silica-UPR composites. The surface, volume resistivity, dielectric strength, dissipation factor and dry arc resistivity of nano silica-UPR composites were found to improve significantly. The effects of the nano and micro fillers in UPR have been evaluated. They are presented in this paper. To evaluate the electrical properties of the nano & micro composites, all the measurements were done as per the prescribed methods in ASTM. It was observed that the addition of nano silica improves the electrical properties as compared to micro silica. The better dispersion of silica particles in unsaturated polyester resin enhances the electrical properties of silica-UPR composites.

Strength and Durability Properties of Recycled Polymer Concrete Using Unsaturated Polyester Resin and Recycled Aggregates (불포화폴리에스터 수지와 재생골재를 이용한 재생 폴리머 콘크리트의 강도 및 내구 특성)

  • Kim, Young-Ik;Sung, Chan-Yong
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.51 no.6
    • /
    • pp.97-103
    • /
    • 2009
  • This study was performed to evaluate the strength and durability properties of recycled polymer concrete using unsaturated polyester resin and recycled aggregates. Unsaturated polyester resin, natural and recycled aggregates and fly ash were used. The mix proportions were determined to satisfy the requirement for the workability and slump according to aggregate sizes (5-10 and 5-25 mm) and unit binder contents (10% and 12%). Tests for the compressive and flexural strength, freezing and thawing and durability for 20% sulfuric solution were performed. The compressive and flexural strength of recycled polymer concrete were in the range of 85~97 MPa and 17.9~20.8 MPa, respectively. The strengths of recycled polymer concrete using recycled aggregate have similar or slightly decreased compared to polymer concrete using natural aggregate. After 300 cycles of freezing and thawing, weight decrease ratio and durability factor of recycled polymer concrete were in the range of 0.13~1.42% and 94~99, respectively.