탈염화수소후의 PVC형상과 화학구조
Chemical structure and PVC shape after dehydrochlorination of PVC
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초록
폴리염화비닐(PVC)을 0～2M NaOH 수용액중에서 반응온도 200～250℃, 반응시간 0～5시간으로 수열처리한 경우 탈염화수소한 PVC 잔류물의 형상과 구조를 조사했다. 잔류물의 형상은 NaOH 농도에 의해 크게 변화하였다. 수중에서는 잔류물이 응집하고, 표면에서는 약 10㎛이하의 세공이 생성되었다. 또한 잔류물의 내부는 촘촘한 망상구조로 되어 있었다. 반면에 NaOH 수용액 중에서는 잔류물의 응집이 거의 관찰되지 않았고 비교적 구상이었다. 그리고 250℃에서 수중과 NaOH 수용액 중에서의 잔류물의 IR Spectrum을 관찰한 결과 C=C 이중결합에 의한 흡수피크 및 방향환의 생성이 나타났다. 폴리염화비닐을 NaOH용액으로 탈염화수소 처리시 잔류물에서는 분자내 및 분자간에서 환화반응 또는 가교반응이 일어나는 것을 알 수가 있었다.
Abstract
PVC powder was dehydrochlorinated by hydrothermal reaction at reaction time 0～5hr, reaction temperature 200～250℃ in 0～2M NaOH solution, and shape and structure of the PVC residue was investigated. The shape of the residue was changed largely according to NaOH concentration. Most of the residue was cohered in the aqueous solution, and many pores less than 10㎛ were formed on the surface. Dense network structure was well developed inside the residue. On the other hand, the residue in the NaOH solution was not cohered and its shape is roughly spherical. In the IR spectrum of the residue both in water and NaOH solution at 250℃, aromatic rings and absorption peak by C=C double bond were observed. From the results, it was observed that aromatic circle reaction and bridge reaction occured inter and intra molecules.
참고문헌 (4)
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