• Title/Summary/Keyword: polycaprolactone

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Development of High Functional Coating Agents for Pulp Mold (IV) - Manufacture of higher functional and biodegradable coating agents - (펄프몰드용 새로운 고기능 코팅제 제조기술개발(제4보) - 고기능 생분해성 코팅제 제조 -)

  • Kang Jin-Ha;Lim Hyun-A;Park Seong-Cheol
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.38 no.1 s.113
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    • pp.45-53
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    • 2006
  • This study was carried out to produce high functional and biodegradable coating agents for pulp mold by evaluating various kinds of biodegradable polymers. Five kinds of biodegradable polymers were used. In addition, the mixture of the carboxymethylated starch and biodegradable polymers(${\kappa}$-carrageenan, chitosan) were used for mixed coating agents. Physical properties of coated paperboards were evaluated. Conclusions obtained were as follows. 4% ${\kappa}$-carrageenan and 5% chitosan showed higher water and oil resistance. 10% sodium alginate, 4% corn zein and 15% polycaprolactone showed high water resistance while no improvement was found on oil resistance. The optimum mixture ratios for the mixed coating agents were 90:10(carboxymethylated starch : ${\kappa}$-carrageenan) and 50:50(carboxymethylated starch : chitosan). Since these mixed coating agents have excellent biodegradability with higher water and oil resistance, these can be used for the environmental-friendly coating agents.

Fabrication of Blended PCL/β-TCP Scaffolds by Mixture Ratio of β-TCP using Polymer Deposition System (폴리머 적층 시스템을 이용한 β-TCP 혼합 비율에 따른 PCL/β-TCP 인공지지체의 제작)

  • Ha, Seong-Woo;Kim, Jong Young
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.9
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    • pp.791-797
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    • 2014
  • Abstract Scaffold used as a carrier of the cell has been actively conducted using plenty of technology in tissue engineering. ${\beta}$-tricalcium phosphate (${\beta}$-TCP) material has shown good biocompatibility and osteoconductive ability when it was implanted as a bone graft substitute in osseous defect in human and animal studies for bone regeneration. In this study, we fabricated the blended polycaprolactone (PCL) and ${\beta}$-TCP scaffold by the polymer deposition system (PDS). The PCL/${\beta}$-TCP scaffold was fabricated at a temperature of $110^{\circ}C$, pressure of 650 kPa, and scan velocity of 100 mm/sec. The Overall geometry and size of the scaffold were fixed circle type with a diameter of 10 mm and a height of 4 mm. PCL/${\beta}$-TCP scaffold was observed by scanning electron microscopy. Cell attachment and proliferation of the scaffold containing 30 wt% ${\beta}$-TCP was superior to those containing 10 wt% and 20 wt% ${\beta}$-TCP.

Electrical Property of Electrospun PCL/MWCNTs Nanofiber with Additive Silver Thin Film (은 박막이 첨가된 전기방사법으로 제작한 PCL/MWCNTs 나노섬유의 전기적 특성)

  • Kim, Jin Un;Kim, Kyong Min;Park, Kyoung Wan;Sok, Jung Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.4
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    • pp.238-243
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    • 2018
  • A nanofiber was fabricated with carbon nanotubes for transparent electrodes. It was prepared with a composite solution of bio-molecules polycaprolactone (PCL) and multiwalled carbon nanotubes (MWCNTs) by electrospinning on a glass substrate, following which its electrical characteristics were investigated. The content of MWCNTs was varied during electrospinning, while that of PCL was fixed. Further, a nanometer-thick thin film of silver was deposited on the nanofiber layer using a thermal evaporator to improve the electrical characteristics; the sheet resistance significantly reduced after this deposition. The results showed that this carbon nanotube nanofiber has potential applications in biotechnology and as a flexible transparent display material.

Development of a Spirulina Extract/Alginate-Imbedded PCL Nanofibrous Cosmetic Patch

  • Byeon, Seon Yeong;Cho, Myung Kwon;Shim, Kyou Hee;Kim, Hye Jin;Song, Hyeon Gi;Shin, Hwa Sung
    • Journal of Microbiology and Biotechnology
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    • v.27 no.9
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    • pp.1657-1663
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    • 2017
  • Cosmetic patches have recently been developed as skin products for personal care owing to rapid advances in the technology of delivery of active ingredients, moisture, and adhesiveness to skin. Alginate and Spirulina are typical marine resources used in cosmetic products. This research involved the development of a Spirulina extract-impregnated alginate nanofiber cosmetic patch supported by a polycaprolactone (PCL) nanofiber cover (Spi/Alg-PCL NF patch). In addition to the ability of alginate to affect moisture and adhesiveness to skin, the impregnation of Spirulina extract strengthened those abilities as well as its own bioactive effectiveness. All fabrication processing steps were undertaken in aqueous solution. The three components (alginate, Spirulina extract, and PCL) had no detected cytotoxicity in human keratinocyte cell-based examination. In addition, wetting the pre-dried patch on the skin resulted in the Spirulina extract being released within 30 min. The results indicate the excellence of the Spi/Alg-PCL NF patch as a skin-care cosmetic device.

Synthesis and Thermal Property of Poly(styrene-g-caprolactone) with Well-defined Structure (분자구조가 제어된 Poly(styrene-g-caprolactone)의 합성 및 그라프트 공중합체의 열적 성질)

  • 오병석;안성국;조창기
    • Polymer(Korea)
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    • v.24 no.3
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    • pp.306-313
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    • 2000
  • Polycaprolactone (PCL) macromer containing terminal methacrylate group was synthesized by ring-opening polymerization. The number average molecular weight of PCL macromer was 11600 g/mole and polydispersity index was 1.09. The synthesized PCL macromer was copolymerized with styrene by stable free radical polymerization using 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO), benzoyl peroxide, and well-defined poly(styrene-g-caprolactone)s were synthesized. The synthesized copolymers was characterized by $^1$H-NMR and gel permeation chromatography equipped with multiangle laser light scattering detector. Thermal properties of graft copolymers were investigated by DSC.

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Influence of biodegradable polymer membrane on new bone formation and biodegradation of biphasic bone substitutes: an animal mandibular defect model study

  • Ku, Jeong-Kui;Kim, Young-Kyun;Yun, Pil-Young
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.42
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    • pp.34.1-34.7
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    • 2020
  • Purpose: The purpose of this study was to evaluate the influence of biodegradable polycaprolactone membrane on new bone formation and the biodegradation of biphasic alloplastic bone substitutes using animal models. Materials and methods: In this study, bony defect was formed at the canine mandible of 8 mm in diameter, and the defects were filled with Osteon II. The experimental groups were covered with Osteoguide as barrier membrane, and the control groups were closed without membrane coverage. The proportion of new bone and residual bone graft material was measured histologically and histomorphometrically at postoperative 4 and 8 weeks. Results: At 4 weeks, the new bone proportion was similar between the groups. The proportion of remaining graft volume was 27.58 ± 6.26 and 20.01 ± 4.68% on control and experimental groups, respectively (P < 0.05). There was no significant difference between the two groups in new bone formation and the amount of residual bone graft material at 8 weeks. Conclusion: The biopolymer membrane contributes to early biodegradation of biphasic bone substitutes in the jaw defect but it does not affect the bone formation capacity of the bone graft.