Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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Changes in the Amount of PEG Free-Flowing Back from PEG-Treated Waterlogged Archaeological Wood and the Compressive Strength According to Relative Humidity Conditions

습도조건에 따른 PEG 처리 수침고목재의 PEG 용출량 및 압축강도 변화

  • Jo, Ah Hyeon (Cultural Heritage Conservation Science Center, National Research Institute of Cultural Heritage) ;
  • Lee, Kwang-Hee (Research Institute of Wooden Cultural Heritage, Korea National University of Cultural Heritage) ;
  • Choi, Tae-Ho (Department of Wood and Paper Science, Chungbuk National University) ;
  • Go, In Hee (Department of Conservation Heritage Science, Chungbuk National University) ;
  • Seo, Jeong-Wook (Department of Wood and Paper Science, Chungbuk National University)
  • 조아현 (국립문화재연구소 문화재보존과학센터) ;
  • 이광희 (한국전통문화대학교 목제문화재연구소) ;
  • 최태호 (충북대학교 목재.종이과학과) ;
  • 고인희 (충북대학교 문화재협동과정) ;
  • 서정욱 (충북대학교 목재.종이과학과)
  • Received : 2020.06.06
  • Accepted : 2020.06.18
  • Published : 2020.06.20
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Abstract

The present study aimed to monitor changes in the amount of PEG free-flowing back from PEG-treated woods and compressive strength changes with change in relative humidity from 90% to 30%. The change in the relative humidity was done 3 times. For the current study, water-logged wood (Prinus group) was used and the wooden blocks cut out of it were subjected to 3 different impregnation methods combined with different drying conditions as follows: 1) impregnating with 80% PEG#4000 followed by drying in nature (hereafter PEG80), 2) impregnating with 40% PEG#4000 and then drying in vacuum freeze drying equipment (hereafter PEG40), and 3) impregnating with 40% PEG#4000 in t-butanol, followed by drying in the vacuum freeze drying equipment (hereafter TB40). It was verified that most of the PEG was free-flowing back from the PEG-treated woods; however, a small amount of left PEG was observed on the lumen surface. The amount of PEG free-flowing back from the PEG-treated woods increased whenever the relative humidity changes from 90% to 30%. The compressive strengths of PEG80 and TB40 were increased whenever the relative humidity changed from 90% to 30%, whereas PEG40 decreased. The current study showed how to control the relative humidity to effectively manage PEG-treated waterlogged woods.

본 연구는 PEG 함침처리한 수침고목재를 대상으로 고습도(RH 90%)에서 저습도(RH 30%)로 습도변화를 주면서 목재 내부에 있는 PEG 및 약제 용출량과 압축강도 특성 변화를 관찰하기 위해 수행되었다. 고습도에서 저습도로의 변화는 3회 실시하였다. 시험에 사용된 수침목재는 졸참나무류(Prinus group)이며, 함침 및 건조 방법은 1) PEG 완료농도 80% 및 자연건조(이하 PEG80), 2) PEG 완료농도 40% 및 진공동결건조(이하 PEG40), 그리고 3) t-butanol을 이용한 PEG 완료농도 40% 및 진공동결건조(이하 TB40) 이다. 목재 내부에 있는 PEG는 3차 습도변화 이후에 대부분 용출되어 제거되었으며, 내강 벽면에 남은 PEG의 결정이 편평하게 고착되었다. 약제의 용출량은 대부분의 경우 습도변화 횟수가 증가할수록 그 양이 증가하였다. 습도조건에 따른 압축강도의 변화는 PEG80과 TB40의 경우 습도변화 횟수가 증가할수록 증가하였으나, PEG40은 감소하였다. 본 연구를 통해 PEG 처리된 수침고목재 보존을 위한 습도조건에 대한 계획 마련에 필요한 기초자료가 마련되었다.

Keywords

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