• Title/Summary/Keyword: 스타이렌

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Synthesis and Characterization of Silica/Polystyrene Composite Nanoparticles by in situ Miniemulsion Polymerization (In situ 미니에멀젼중합에 의한 실리카/폴리스타이렌 복합체 나노입자의 합성과 특성)

  • Patole, Archana S.;Patole, S.P.;Song, Mi-Hyang;Yoon, Joo-Young;Kim, Jin-Hwan;Kim, Tae-Ho
    • Elastomers and Composites
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    • v.44 no.1
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    • pp.34-40
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    • 2009
  • New coupling agent or surface modified agent (9-decenoic acid) was used to enhance the compatibility between silica and polystyrene in silica/polystyrene hybrid nanocomposite, synthesized by in situ miniemulsion polymerization. Composites contain well dispersed nanosize silica particles. Related tests and analyses confirmed the success of synthesis. Functionalization of silica by 9-decenoic acid and silica on the polystyrene was confirmed by FTIR. TGA showed presence and amount of silica in final latex. The glass transition temperature of the hybrid nanocomposite was increased with the silica amount. SEM and TEM analysis showed the spherical morphology of PS and composite with an average diameter of 55 nm. The presence of silica within composite was confirmed by EDS attached to the existing TEM.

Fabrication of Super-hydrophobic Surface using Solubility Difference of Polystyrene at Two Different Solvents (두 용매에서의 폴리스타이렌의 용해도 차이를 이용한 초소수성 표면 제조)

  • Jung, Jin-Suk;Park, Kwang-Bae;Choi, Ho-Suk
    • Clean Technology
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    • v.14 no.1
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    • pp.35-39
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    • 2008
  • In this study, we successfully fabricated a super-hydrophobic polymer layer on the surface of slide glass using the solubility difference of a polymer at two different solvents. After dissolving polystyrene (PS) resins in tetrahydrofuran (THF) as a good solvent and then adding ethanol(EtOH) as a poor solvent, we were able to fabricate super-hydrophobic surface. We also investigated the effect of EtOH addition, coating methods, solution mixing time and speed, and other alcohols on the surface hydrophobicity. The water contact angle (WCA) of the fabricated surface revealed $WCA>150^{\circ}$ and the microporous surface structure composed of microparticles with the size less than $5\;{\mu}m$.

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Liquefaction Characteristics of Polypropylene-Polystyrene Mixture by Pyrolysis at Low Temperature (Polypropylene-Polystyrene 혼합물의 저온 열분해에 의한 액화특성)

  • Cho, Sung-Hyun;Kim, Chi-Hoi;Kim, Su-Ho;Lee, Bong-Hee
    • Clean Technology
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    • v.16 no.1
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    • pp.26-32
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    • 2010
  • The low temperature pyrolysis of polypropylene (PP), polystyrene (PS) and polypropylene-polystyrene (PP-PS) mixture in a batch reactor at the atmospheric pressure and $450^{\circ}C$ was conducted to investigate the synergy effect of PP-PS mixture on the yield of pyrolytic oil. The pyrolysis time was varied from 20 to 80 mins. The products formed during pyrolysis were classified into gas, gasoline, kerosene, gas oil and heavy oil according to the petroleum product quality standard of Ministry of Knowledge Economy. The analysis of the product oils by GC/MS(Gas chromatography/Mass spectrometry) showed that new components were not detected by mixing of PP and PS. There was no synergy effect according to the mixing of PP and PS. Conversions and yields of PP-PS mixtures were linearly dependent on the mixing ratio of samples except for heavy oil yields. Heavy oil yields showed almost constant regardless of the mixing ratio.

Surface Modification of Fine Particle by Plasma Grafting in a Circulating Fluidized Bed Reactor under Reduced Pressure (감압 상태 순환유동층 반응기에서 플라즈마 그래프팅에 의한 미세입자 표면 개질)

  • Park, Sounghee
    • Korean Chemical Engineering Research
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    • v.53 no.5
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    • pp.614-619
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    • 2015
  • A plasma surface modification of powders has been carried out in a circulating fluidized bed reactor under reduced pressure. Polystyrene (PS) particles treated by plasma are grafted with polyethylene glycol (PEG) on the surface. The virgin, plasma-treated and grafted powders were characterized by DPPH method, FTIR, SEM and contact angle meter. The plasma-treated PS powders have well formed peroxide on the surface, By PEG grafting polymerization, PEG is well grafted and dispersed on the surface of the plasma-treated PS powders. The PEG-g-PS particle was successfully synthesized using the plasma circulating fluidized bed reactor under reduced pressure.

Preparation and Their Properties of Hot-Melt Adhesive using Styrene Block Copolymer and Petroleum Resin (스타이렌 블록 공중합체(SBC)와 석유수지를 이용하여 제조한 핫멜트 접착제의 제조 및 특성)

  • Jeong, Booyoung;Cheon, Jungmi;Yoo, Chongsun;Chun, Jeahwan
    • Journal of Adhesion and Interface
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    • v.9 no.4
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    • pp.12-16
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    • 2008
  • Hot-melt adhesive was solid phase in room temperature as 100% solid contents. So it has advantage which attach to substrate with the low pressure heat, fast adhesion speed and environment friendly. In this study, We studied about the effect of a kind of SBS resin and petroleum resin as a tackifier resin and their ratio for hot-melt adhesive on properties. The styrene and $C_9$ resin contents in hot-melt adhesive was increased with increasing viscosity, tensile strength, peel strength and thermal resistance.

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Styrene-Butylacrylate Based Suspension Polymerized Toner Prepared Using PVA as a Suspending Agent (PVA를 현탁제로 사용하여 제조한 스타이렌-부틸아크릴레이트 기반 현탁중합토너)

  • Park, Solmon;Kim, Duk Eung;Byun, Jihyun;Yu, Jae Goang;Kim, Dae Su
    • Korean Chemical Engineering Research
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    • v.48 no.2
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    • pp.212-217
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    • 2010
  • In this study, suspension polymerized toners were prepared by using poly(vinyl alcohol)(PVA) as an organic suspending agent. Styrene and butylacrylate monomers were used simultaneously with carbon black to prepare microspherical polymerized toners with a narrow-particle size distribution. Preliminary particles without carbon black were polymerized first to optimize suspension polymerization conditions. The preliminary particles were prepared at various polymerization conditions and their characteristics were compared to each other to determine an optimized polymerization condition. The black polymerized toner prepared at the optimized polymerization condition showed reasonable particle size and shape, and good thermal and printing characteristics by showing its glass transition temperature at $53.6^{\circ}C$.

Application of Universal Scaled Reduced Temperature Parameter to the Three-Arm Star Polystyrene (세팔 별모양 폴리스타이렌 사슬의 팽창에 대한 만능 환산 온도 파라미터의 적용)

  • ;;Ling Yun
    • Polymer(Korea)
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    • v.27 no.3
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    • pp.255-264
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    • 2003
  • Various chain sizes 3-arm star polystyrenes (PS, $M_{w}$=2.80$\times$10$^{5}$ , 2.49$\times$10$^{6}$ g/mol) in t-decalin solution were measured at the temperature range of 20~7$0^{\circ}C$ by means of viscometry and laser light scattering. In order to show universality in the expansion factor of 3-arm star polymer, it was expected that (N/ $R_{G,Br,o}$$^{2}$)$^{3}$2/$\tau$/$\tau$$_{C}$ would be used as an universal parameter, where $R_{G,Br,o}$ was the unperturbed radius of gyration of star PS. However, much better universality had been observed when (N/ $R_{G,Br,o}$$^{2}$)$^{3}$2/$\tau$/$\tau$$_{C}$ parameter of the linear PS was used even for the 3-arm star PS. It could be explained if branching effect had been already taken into account in the part of $\tau$/$\tau$$_{C}$(=[(Τ-Θ$_{Tc}$ )/Θ$_{Tc}$ ]/[(Θ$_{Tc}$$_{c}$)/ $T_{c}$]). Here N and Θ$_{Tc}$ stand for the number of monomer unit in a single polymer chain and a kind of theta temperature as the critical solution temperature $T_{c}$ of the infinite molecular weight, respectively.ely.y.ely.

Catalytic degradation of waste plastics over solid acid catalysts (고체 산촉매에서 폐플라스틱의 분해 반응)

  • 이경환;전상구;김광호;노남선;신대현;서영화
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2002.11a
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    • pp.185-186
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    • 2002
  • 폐 플라스틱은 석유 물질인 탄화수소로 구성하고 있지만 효과적으로 재활용되지 못하고 대부분 매립, 소각 등의 방법으로 처리하고 있다. 플라스틱은 다양한 용도로 사용되기 때문에 플라스틱의 이용과 소비의 증가는 필연적이다. 예로 미국 가정의 폐 플라스틱은 63% 폴리에틸렌, 11% 폴리프로필렌, 11% 폴리스타이렌, 7% PET 그리고 7% PVC가 발생되는데 이들 화합물 구조가 포화탄화수소형이기 때문에 70% 정도가 방향족 화합물인 석탄에 비해 수소첨가 반응이 요구되지 않는다.(중략)

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