• Title/Summary/Keyword: Siloxane oligomer

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Preparation and Adhesive Properties of Acrylate Copolymer with Siloxane Group (실록산기를 함유한 아크릴 공중합체의 제조 및 점착특성)

  • Yoon, Keun-Byoung;Noh, Young-Joo;Lee, Dong-Ho
    • Applied Chemistry for Engineering
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    • v.18 no.2
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    • pp.121-125
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    • 2007
  • Siloxane monomer and oligomer were introduced to n-butyl acrylate and methyl methacrylate copolymer for improvement of water resistance and tactile sensation of acryl-type emulsion. Terpolymerimerization of n-butylacrylate, methyl methacrylate and siloxane monomer or oligomer was carried out in aqueous solution. The glass transition temperature (Tg) of terpolymer decreased with increasing siloxane monomer, however, the Tg of terpolymer increased with increasing siloxane oligomer due to the crosslinking of acrylated end group. The adhesion property and surface energy of the obtained terpolymer decreased with introducing siloxane monomer or oligomer in terpolymer. Decrement of tack and surface energy means the enhancement of water resistance and tactile sensation of the emulsion.

Effect of Siloxane Oligomer on Thermal Stability and Internal Stress of Epoxy Resins (실록산 올리고머가 에폭시 수지의 열안정성 및 내부응력에 미치는 영향)

  • Kwak, Geun-Ho;Park, Soo-Jin;Park, Jun-Ha;Kim, Kong-Soo
    • Applied Chemistry for Engineering
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    • v.10 no.5
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    • pp.701-706
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    • 1999
  • The effect of siloxane oligomer content on thermal stability and internal stress of DGEBA epoxy resin was investigated. Siloxane-epoxy polymers having terminal epoxy group were prepared by reaction of siloxane-DDM prepolymer with DGEBA epoxy resin. Thermal stability was studied in terms of the initial decomposition temperature(IDT), temperature of maximum rate of weight loss($T_{max}$), integral procedural decomposition temperature(IPDT), and decomposition activation energy($E_t$) using TGA data. The thermal stability increased with increasing the siloxane oligomer content and showed a maximum value in the case of 5 wt% siloxane oligomer content in the blend system. While, the coefficient of thermal expansion(${\alpha}_r$) and the flexural modulus($E_r$) allowed us to study internal stress of the blend system. As the content of siloxane oligomer increases, the internal stress systematically decreases as decreasing both ${\alpha}_r$ and $E_r$.

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A Synthesis of UV Hard Coating Solution for Plastic Display Plate Using Poly(Urethane Acrylate) Siloxane Oligomer (Poly(Urethane Acrylate) Siloxane Oligomer를 이용한 플라스틱 디스플레이 기판용 UV 하드코팅 용액의 합성)

  • Back, Sung Kyun;Jang, Sun Ho;Yoo, Seong Sik;Cho, Ur Ryong
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.3
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    • pp.87-92
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    • 2017
  • Poly(urethane acrylate) siloxane oligomers with Interpenetrating polymer networked nanoparticles were prepared to synthesize hard coating solution by reaction with isophorone diisocyanate(IPDI) of 1, 2, 3, 4 phr. The structures and molecular weights of the synthesized solutions were characterized by IR spectroscopy and gel permeation chromatography, respectively. In the cross-cut test for the adhesion, all the solutions showed good adhesion of 5B regardless of the content of IPDI and film thickness. The addition of 1 phr IPDI resulted in the best pencil hardness. The IPDI combined siloxane hard coating solution showed more flexibility than the siloxane solution. These results will yield the improvement in the siloxane solution using for plastic display plate.

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Synthesis and Chnracterization of Organophilic Montmorillonites Modified with Alkyl Siloxane Amino 01igomers (알킬실록산 아민 올리고머 구조를 함유한 친유성 몬모릴로나이트의 제조 및 특성평가)

  • 김효주;김용석;원종찬;이미혜;최길영
    • Polymer(Korea)
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    • v.27 no.2
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    • pp.135-141
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    • 2003
  • A series of organophilic montmorillonites (MMTs) modified with various alkyl siloxane amino oligomer groups have been synthesized and their properties were investigated. New organophilic MMTs containing siloxane amino oligomers with alkyl group instead of conventional alkyl amines were synthesized to improve thermal stability as well as gallery spacing. The organophilic MMTs were synthesized from MMT by utilizing the siloxane amino oligomers with various alkyl groups in the water/dioxane solution, which was performed without aq. HCl. Thermal decomposition temperature, gallery spacing, and hydrophobicity of synthesized organophilic MMTs were investigated. X-ray diffraction and TEM experiment results on new organophilic MMTs demonstrated that introduction of siloxane amine oligomers increased d-spacing between silicate layers. The decomposition temperatures of new organophilic MMTs measured by TGA was remarkably improved above 200℃ as compared with those of conventional alkyl substituted organophilic MMTs.

Syntheses and Properties of Copolymers of Tetramethyldisiloxane and 1,4-Bis(dimethylhydroxysilyl)benzene (Tetramethyldisiloxane-1,4-bis(dimethylhydroxysilyl)benzene 공중합체의 합성 및 특성)

  • Kim, Sun-ll;Yun, Young-Jae;Na, Jae-Woon
    • Applied Chemistry for Engineering
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    • v.7 no.3
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    • pp.490-495
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    • 1996
  • Low molecular weight linear chlorine terminated siloxanes (yields;71.2~86.5%) were prepared by reactions of cyclotri-, cyclotetra- and cyclopentasiloxane with dimethyldichlorosilane in the presence of pyridine N-oxide catalyst. The amine terminated siloxane oligomers were obtained in good yields(76.2~85.3%) by the reaction of linear chlorine terminated siloxanes with dimethylamine at $0^{\circ}C$. In this investigation, we have studied on the syntheses and properties of copolymers (yields;58.0~71.0%) obtained from the reaction of amine terminated siloxane oligomers with 1,4-bis(dimethylhydroxysilyl)benzene. The structures and properties of the copolymers were examined by FT-IR, $^1H$-NMR, TGA and DSC. Initial degradation temperatures($T_D{^i}$) of the polymer I and IV were confirmed as 476 and $485^{\circ}C$, respectively. The thermal stabilities of the polymers were found to be increased with increasing n of $(R_2SiO)_n$. The glass transition temperatures(Tg) of the polymers were increased with decreasing n of $(R_2SiO)_n$, and the lowest Tg revealed $-76^{\circ}C$ when n=5.

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