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Properties of Poly(ethylene glycol)-Grafted Poly(lactic acid) Plasticized with Poly(ethylene glycol)
최경만,하창식,임성욱,최면천,한동훈 한국고분자학회 2014 Macromolecular Research Vol.22 No.12
Poly(lactic acid) (PLA) was grafted by a poly(ethylene glycol) (PEG) acrylate through reactive blendingmethod and consecutively blended with a low molecular weight PEG plasticizer. The grafted PEG on the PLA wasconfirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. Propertiesof the plasticized PLAs (PLEs), prepared by blending the PEG-grafted PLA (PLG) with various contents of the PEGplasticizer, were investigated using tensile testing, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry(DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and hydrolytic degradation analysis. The tensile strength of the plasticized PLA (PLE09) was decreased by 48%, from 51.1 to 26.7 MPa, while its elongationat break increased by 24 times, from 6.5% to 158%. Thermal properties and biodegradability were also greatlyinfluenced by the hydrophilic PEG modifier.
사방지(砂防地) 식생천이(植生遷移)와 토양변화에 관한 연구(중부 화강암지대를 중심으로)
최경,최정용 한국임학회 1987 한국산림과학회지 Vol.76 No.3
砂防地의 管理指針을 提示하기 위하여 零州, 利川, 楊州, 抱川地域에서 砂防地의 植生遷移와 土壤變化 等, 現 實態를 調査한 바, 施工年次가 經過됨에 따라 다음과 같이 變化하였다. (1) 優占種 變化 施工 5年 : 오리나무類, 아까시나무, 리기다소나무 順에서 施工 10年 : 오리나무類, 리가다소나무, 소나무, 참나무類 順으로 施工 15年 : 새, 솔새, 개솔새 順에서 施工 20年 : 새, 기름새, 산기울 順으로 되었다. (2) 施工 20年이 經過하면 平均落葉尸의 깊이는 3.5㎝, 平均土深(C₃ 尸包含)은 28㎝까지 形成되있다. (3) 施工年次가 經過됨에 따라 有效燐酸含量은 減少되며, 粘土含量, 有機物含量, 置換性鹽基, 陽이온 置換容量 等은 增加되었다.
최경도 한국 헨리제임스 학회 1999 헨리 제임스 연구 Vol.- No.4
In Henry James's The Portrait of a Lady(1881), Isabel Archer's return to Rome at the end attracted much controversy because the cause of her return is not fully explained in the novel. However, the major motive for her return is the result of her pledge to the people around her. More significantly, the pledge Isabel had made is closely linked to her sense of obligation, since she has preoccupied with the sanctities and solemnity of marriage to Gilbert Osmond. This sense of the pledge is accomplished by her total abandoning of the personal and practical advantages. For Isabel, marriage means a total commitment of one person to another and therefore is to be regarded as indissoluble. Isabel's devotion to Osmond accounts for her moral consistency not from reasoning, but from her sense of duty as a married woman. Isabel does not change her attitude toward Osmond even after she comes to know the conspiracy and malignity of her husband and Madame Merle. Her acceptance of destiny can be seen as a moral superiority to these people who have so calculatingly exploited her. Isabel's action in the end, then, is seen to be fully consistent with what she did earlier. Because she was preoccupied with her ideal of freedom and independence, her marriage to Osmond was made through her own decision, bearing all responsibilities for herself. And when Isabel knows that her husband is the reverse of what she thought he would be, she does not flee from her own decisions because her moral notion makes her unable to abandon the consequences of her actions. Along with this, Isabel's return to Rome is considered as James's scheme of showing how his heroine cannot be destroyed despite the flaw of her character. Indeed, James has much interest in the survival of the heroine in terms of morality in the fact that the innocent character is not morally corrupted in the midst of the complicated world. Consequently, in her full knowedge of the world, Isabel asserts her morality and is never defeated.