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심민지,차상호,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In order to flame retard polymers or to protect them from fire, flame retardant additives can be incorporated into them. Flame retarding system is classified into two types; additive- and reactive-approach. To investigate the flame retardancy according to incorporating method, a methacrylate-type flame retardant with phosphorus-containing compound, 2-[(diphenoxyphosphoryl)oxy]ethyl methacrylate (DPEMA), was synthesized. DPEMA was then polymerized and used as additivetype flame retardant in poly(methyl methacrylate) (PMMA). Also, the copolymerization of DPEMA and methyl methacrylate (MMA) was conducted to apply to reactive-type system. The flame retardancy of two-type systems was evaluated by limiting oxygen index (LOI) and vertical burning test (UL 94), and the differences between the two systems were examined via various analyzes.
심민지,김혜지,박유리,차상호 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
A flame retardant, PBPP2, was prepared via two-steps reaction and its chemical structure was confirmed by ¹H NMR and FTIR. PLA was polymerized by the ring opening polymerization. The samples for evaluation were prepared via solution casting method. To evaluate the flame retarding ability, limiting oxygen index (LOI) and the vertical burning test was performed. The thermal degradation behavior was illustrated by TGA and real-time FTIR. For PLA-3, LOI increased 23 % to 30 % compared with the pure PLA, and thermal stability also increased. These results indicated that condensed-phase flame retardant mechanism was superior to gas-phase's. Also, the mechanical property and the melting behavior were analyzed by UTM and DSC, respectively. Therefore, we obtained that PBPP2 can simultaneously act as flame retardant and plasticizer.
Preparation and characterization of flame retarded polyketone
심민지,차상호 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
A novel phosphorus-nitrogen flame retardant, PNFR, was synthesized and its chemical structure was characterized by 1H NMR. To evaluate the flame retarding mechanism of PNFR, FTIR was performed by temperature with furnace. The flame retardancy of the neat and flame retarded polyketone which were prepared via solution casting method was investigated by the vertical burning test. Then, the morphology of char residues was recorded using scanning electron microscope. To investigate the thermal stability, thermogravimetric analysis was conducted. By adding PNFR to polyketone, while thermal stability decreased, char residues significantly increased and superior flame retardancy was shown. Also, we obtained the effect of PNFR on mechanical property and crystallinity of polyketone using universal testing machine and differential scanning calorimetry.
Synthesis and characterization of cardanol-based flame retardant for PVC
심민지,차상호,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
A cardanol-based flame retardant, FR, was synthesized and characterized via 1H NMR. To investigate the flame retarding mechanism of FR in condensed-phase, the chemical structure of FR with temperature was analyzed using FTIR and TGA. The flame retardancy of neat PVC and flame retarded PVC was evaluated by LOI and UL 94 test. When 7 wt% FR was incorporated, it was achieved V-0 rating due to selfextinguishable property within 10s after ignition and no drips. To demonstrate the additional flame retarding mechanism, SEM images of residual char were recorded. Additionally, the effect of FR on melting behaviors and tensile properties was confirmed via DSC and UTM. These results shown that FR can act as flame retardant and plasticizer for PVC.
인플루언서 특성이 MZ세대의 소비가치와 구매의도에 미치는 영향
심민지,태동숙 한국화장품미용학회 2022 한국화장품미용학회지 Vol.12 No.3
본 연구는 인플루언서 특성이 MZ세대의 소비가치와 구매의도에 미치는 영향을 알아보기 위하여 부산·경남지역의 MZ세대를 대상으로 2022년 7월 21일부터 8월 19일까지 30일간 설문 조사를 실시하였으며, 배포된 설문지 중 300부를 최종 분석에 사용하였다. 그리고 본 연구에서 수집된 자료는 SPSS 25.0을 이용하여 분석하였다. 분석 결과는 다음과 같다. 첫째, 인플루언서 특성 중 매력성과 신뢰성은 소비가치의 모든 하위요인에 정(+)의 영향을 주며, 인플루언서 특성 중 전문성은 소비가치의 모든 하위요인에 부(-)의 영향을 미쳤다. 둘째, 인플루언서 특성의 모든 하위요인은 구매의도에 정(+)의 영향을 주는 것으로 나타났다. 셋째, 소비가치 중 기능적 가치와 사회적 가치, 진귀적 가치는 구매의도에 정(+)의 영향을 주며, 소비가치 중 감정적 가치는 구매의도에 부(-)의 영향을 미쳤다. 따라서 본 연구를 통하여 인플루언서 특성은 MZ세대의 소비가치와 구매의도에 대체적으로 유의미한 영향을 준다는 것을 알 수 있었다.
Synthesis and characterization of phosphorus-nitrogen flame retardant for polyketone
심민지,차상호,이종찬 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
A phosphorus-nitrogen flame retardant (PNFR) was synthesized for polyketone (PK). The neat and flame-retarding PK was prepared via solution casting method. Firstly, the flame-retardant mechanism of PNFR was investigated using TG-FTIR and SEM. Then, the flame retardancy of neat and flame-retarding PK was evaluated by limiting oxygen index and vertical burning test. After combustion, the morphology of residual char was recorded via SEM. To confirm the thermal stability, TGA was performed. With the addition of PNFR, while thermal stability of PK decreased, the considerable amount of residual char was observed. Also, the flame-retarding PK exhibited the superior flame retardancy by self-extinguishing property. In addition, the addition of PNFR decreased meting point and crystallinity of PK, suggesting that PNFR induced plasticizing effect into PK.