Article
  • Synthesis and Properties of Mixed meta-and para-Cresol/Formaldehyde Novolak Resins
  • Lee SK, Lee HW
  • m-, p-크레졸/포름알데히드 노볼락 수지의 합성과 물성에 관한 연구
  • 이석규, 이해원
Abstract
Novolak resin was synthesized by an acid catalyzed condensation of m-/p-cresol with 37% formaldehyde and then treated with the mixture of methanol and water as solvents in order to get improved thermal properties of novolak. The composition of novolak was identified with 1H∼/l3C-NMR spectroscopy. In 1H-NMR spectra, methylene proton peaks of novolak resin were observed in the range of 3.4∼4.3ppm. In 13C-NMR spectra, methylene carbon peaks were observed in the range of 31.8∼37.7ppm, but there were no prominent changes before and after solvent treatments. The initial decomposition temperature(Tid) of novolaks was obsered in the range of 160∼250℃. The glass transition temperature(Tg) of novolaks was varied on the change of mixing ratio of H2O/MeOH. The highest glass transition temperature was 115℃ when the synthetic novolak resin were treated with the mixture of 2parts of methanol and 1part of water. The average molecular weight(Mw) of novolaks decreased with increasing the mixing ratio, however the molecular weight distribution(Mw/Mn) of solvent-treated novolaks was almost the same on the change of mixing ratio.

m-크레졸과 p-크레졸 및 포름알데히드를 옥살산 촉매로 사용하여 축합중합반응으로 혼합 크레졸 노볼락 수지를 합성하였으며, 합성된 노볼락 수지를 H2O/MeOH로 용매 처리하여 열적 성질의 향상을 시도하였다. 노볼락 수지의 구조는 1H-NMR과 13C-NMR을 이용하여 분석하였다. 메틸렌의 양성자 피크는 1H-NMR의 경우에 3.4~4.3ppm에서 나타나고 13C-NMR의 경우에 31.8~37.7ppm에서 관찰되었으나, 용매처리에 의한 노볼락의 피크 변화는 없었다. 모든 노볼락의 초기 열분해 온도(Tid)는 160~250℃에서 나타났고, Tg는 90~115℃에서 관찰되었으며 낮은 H2O/MeOH의 비로 침지시킨 노볼락일수록 Tg가 높아지는 경향을 보였다. 노볼락 수지의 평균 분자량(Mw)은 높은 H2O/MeOH의 비로 침전시킬수록 감소하였으며, 분자량 분포(Mw/Mn)는 물의 양에 관계없이 3.4~3.6정도의 비슷한 경향을 보였다.

Keywords:

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1992; 16(6): 662-668

    Published online Nov 25, 1992

  • 10.7317/pk.
  • Received on Nov 30, -0001
  • Revised on Nov 30, -0001
  • Accepted on Nov 30, -0001

Correspondence to

  • E-mail: