• Title/Summary/Keyword: 폴리카프로락톤

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Properties of Polycaprolactone Modified by Reaction Extrusion (반응압출법에 의해 개질된 폴리카프로락톤의 물성에 관한 연구)

  • Shin, Boo Young;Jang, Sang Hee
    • Clean Technology
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    • v.12 no.4
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    • pp.198-204
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    • 2006

  • The modification of biodegradable polycaprolactone was accomplished by reactive extrusion with various contents of free radical initiator. Reaction conditions were in the temperature range of $130^{\circ}C$ to $180^{\circ}C$ with initiator contents of 0.1, 0.3, 0.5 and 1.0 wt%. To characterize the modified polycaprolactone (PCL), molecular weight was measured by gel permeation chromatography(GPC) and thermal, mechanical and rheological properties as well as biodegradability were measured. The modified PCL (MPCL) with 1% of initiator showed ca. 20% increase in crystallinity and ca. 50% increase in tensile modulus. Also, a large increase in rheological properties such as complex viscosity, storage and loss modulus was observed. The biodegradability of most MPCL was higher than that of virgin PCL.

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폴리에틸렌테레프탈레이트/폴리카프로락톤 용융 블렌드에서 폴리카프로락톤 분자량 고 촉매 함량에 따른 에스테르 교환 반응 거동

  • 임경율;윤기종
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.10a
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    • pp.5-8
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    • 1998

  • 폴리에스테르 공중합체의 합성에 이용될 수 있는 에스테르 교환 반응은 alcoholysis, acidolysis 및 transesterification 반응들에 의해 복합적으로 진행되며 이 때 각각의 반응 속도를 비교하여 보면 어느 한 쪽 분자쇄의 말단 알코올기가 다른 쪽 분자쇄의 에스테르기를 공격하는 alcoholysis 반응이 가장 빠르고 카르복실기가 에스테르를 공격하는 acidolysis 및 두 고분자 주쇄의 에스테르기 상호간에 발생하는 transesterification 반응들은 alcoholysis 반응에 비해 느린 것으로 알려져 있다. (중략)

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Synthesis and characterization of Star Shape Polycaprolactone containing 4-Arm Polycaprolactone Core (4개의 폴리카프로락톤 가지 코어를 가지는 스타형 폴리카프로락톤의 합성 및 분석)

  • An, Sung-Guk;Cho, Chang-Gi
    • Proceedings of the Korean Fiber Society Conference
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    • 2002.04a
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    • pp.199-202
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    • 2002

  • The synthesis of materials with controlled composition and architectures continues to be a focus of considerable current research. Dendritic multiarm polymers such as dendrimer, hyperbranched polymer, and star polymers are three dimensional macromolecules, in which a large number of linear arms of similar molecular weight and narrow molecular weight distribution emanate from a central core. (omitted)

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Preparation and Curing Behavior of Polyurethane Coatings by Polyester/Lactone Polyol and HDI-biuret (폴리에스테르/락톤 폴리올과 HDI-Biuret에 의한 폴리우레탄 도료의 제조 및 경화거동)

  • 최용호;김대원;황규현;박홍수;김태옥
    • Polymer(Korea)
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    • v.24 no.1
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    • pp.72-81
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    • 2000

  • Benzoic acid polyester/lactone polyol were synthesized by polycaprolactone 0201 as diol, trimethylolpropane as triol, adipic acid as dibasic acid, and benzoic acid as monobasic acid. Polyisocyanate prepolymer Desmodur N-100 of HDI-biuret type was used in this study. Two-component polyurethane coatings were prepared by blending benzoic acid polyester/polycaprolactone, polyisocyanate, wetting/dispersing agent, white pigment, and flowing agent. Various properties were examined on the film coated with the prepared polyurethane. They showed excellent physical properties such as abrasion resistance, accelerated weathering resistance, and yellowness index. They also showed good physical properties such as flexibility, impact resistance, 60$^{\circ}$ specular gloss, cross hatch adhesion, hydrocarbon resistance, and lightness index difference. Hardness of coating showed a little poor character. The introduction of polycaprolactone 0201 as diol in the polyurethane coatings improved the hydrocarbon resistance, impact resistance, and flexibility of coatings. According to the drying and curing behavior with the contents of benzoic acid, they seem to have reasonable coating properties such as drying time of 2 to 4 hours and pot-life time of 20 to 37 hours.

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