• Elastomers and Composites
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• 제48권1호
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• pp.85-91
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• 2013

본 연구에서는 메탈로센 촉매, 공촉매 시스템을 이용한 에틸렌, 1-헥센, 스티렌계 단량체가 포함된 삼원공중합체를 합성하였다. 본 연구에서 비교 및 분석을 위하여 사용한 스티렌계 단량체들로는 스티렌, p-methylstyrene, 4-tert-butylstyrene 이다. $^{13}C$ NMR과 $^1H$ NMR을 이용하여 삼원공중합체의 구조를 분석하였고 조성을 확인하였다. 삼원공중합체의 촉매활성도, 수율, 분자량을 비교하였고 삼원공중합체에 삽입된 스티렌계 단량체에 따른 유리전이온도, 결정화도 및 열적특성을 DMA, WAXS 및 TGA 등을 이용하여 분석하였다.

• Macromolecular Research
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• 제9권2호
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• pp.122-128
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• 2001

Monodisperse composite latex particles with size of ca. 300 nm, which consist ofn-butyl acrylate as a soft phase and methyl methacrylate as a hard phase with different morphology, were synthesized by seeded multi-stage emulsion polymerization. Three types of composite latex particles including random-, core/shell-, and gradient-type particles were obtained by using different monomer feeding methods during semi-batch emulsion polymerization. Effect of poly(butyl acrylate)-poly(methyl methacrylate) rubber particle morphology on the mechanical and rheological properties of rubber toughened poly(methyl methacrylate) was investigated. Among three different rubber particles, the gradient-type rubber particle showed better toughening effect than others. No significant variation of rheological property of poly(methyl methacrylate)/rubber blends was observed for the different rubber particle morphology.

• Macromolecular Research
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• 제12권5호
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• pp.493-500
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• 2004

We have developed a novel method for patterning functional images in thin polymer films. The key materials we utilized for the imaging were dihydroxyanthraquinones protected with acid-labile tert-butoxycarbonyl (t-Boc) blocking groups. Among the tested compounds, 1,4-dihydroxyanthraquinone (quinizarin; 1) underwent the most drastic change in terms of its color and fluorescence upon protection. We prepared the t-Boc-protected quinizarin and polymers bearing the protected quinizarins as pendent groups. To investigate the possibility of a single-component imaging system, we synthesized a styrenic monomer 14 incorporating protected quinizarin and a maleimide derivative 15 bearing a photoacid generating group and subjected them to polymerization. Selective removal of the protecting groups of the quinizarin moieties in the exposed area using photolithographic techniques allowed regeneration of quinizarin and patterned fluorescence images in the polymer films.