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Tricaprylmethylammonium Chloride 에 의한 Methyl Methacrylate 의 라디칼 중합
박상욱,문진복,하유수,김종현 ( Sang Wook Park,Jin Bok Moon,Yoo Su Ha,Jong Hyeon Kim ) 한국공업화학회 1993 공업화학 Vol.4 No.2
Na_2S_2O_4 수용액과 CCl_4-toluene 용액의 2상에서 유기상에 용해하는 tricaprylmethylammonium chloride 상이동 촉매를 사용하여 methyl methacrylate의 라디칼 중합속도를 측정하여, 액-액 불균일계 접촉계면을 통한 라디칼 중합반응기구를 해석하였다. MMA의 중합속도는 수용액상에 존재하는 Q^+ 이온의 농도와 S_2O_4^(-2) 이온의 농도의 제곱근에 정비례하고 CCl_4와 MMA의 농도에 각각 정비례하였다. The phase-transfer polymerization of methyl methacrylate with tricaprylmethylammonium chloride-Na_2S_2O_4-CCl_4 initiator system was investigated in an aqueous-organic two-phase system. The observed rates of polymerization were compared with those obtained from the polymerization mechanism proposed with a cyclic phase-transfer initiation step. The rate of polymerization was found to be proportional to the concentration of Q^+ and square root of S_2O_4^(-2) in the aqueous solution and the feed quantity of CCl_4 and MMA.
박해관,주원일,구본강,하미연,유수정,전흥재 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
The objective of the present study was to evaluate non-woven collagen/poly(lactic-co-glycolic acid) fibrous scaffold (Col/PLGA FS) prepared by a co-electrospinning process using a novel multi syringe electrospinning system for dura repair. The morphological and mechanical properties of the fibrous scaffolds (FSs) were assessed by scanning electron microscopy (SEM) and a universal testing machine (UTM). The changes in chemical composition due to the incorporation of collagen into PLGA were determined by Fourier transform infrared spectroscopy-attenuated total reflection mode (FTIR-ATR). The biocompatibility of the FSs was also evaluated in vitro in cultures of mouse fibroblasts and in vivo by subcutaneous implantation studies in rats. SEM images of the samples showed that the fiber size distribution of Col/PLGA FS became narrow compared to that of PLGA FS due to the incorporation of collagen with small fiber diameter. The FTIR-ATR spectrum of Col/PLGA FS revealed the characteristic bands of collagen and PLGA, indicating the co-existence of two fibrous structures. The poor mechanical properties of collagen FS were improved by co-electrospinning with PLGA. In vitro L929 cell proliferation assay revealed that the cyto-compatibility of Col/PLGA FS was increased compared to that of PLGA FS. In addition, Col/PLGA FS showed increased hydrophilic properties sufficient to absorb the exudates at the interface with mild foreign body reactions. In animal studies using a traumatic brain injury (TBI) model, the incorporation of collagen induced increased macrophage chemotaxis, and the post-inflammatory reaction of these cells led to remarkable brain tissue regeneration.