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Effect of Solvent on the Grafting Polymerization of Polyethylene Wax with Maleic anhydride

폴리에틸렌 왁스와 무수 말레인산의 그라프팅 중합 반응에서 용매가 미치는 영향

  • Yu, Si-Won (Department of Chemical Engineering, Kwangwoon University) ;
  • Choi, Joong-So (Department of Chemical Engineering, Kwangwoon University) ;
  • Na, Jae-Sik (Department of Chemical Engineering, Kwangwoon University)
  • 유시원 (광운대학교 공과대학 화학공학과) ;
  • 최중소 (광운대학교 공과대학 화학공학과) ;
  • 나재식 (광운대학교 공과대학 화학공학과)
  • Received : 2013.11.18
  • Accepted : 2013.01.22
  • Published : 2014.02.28

Abstract

In this study, we have investigated the influence of the nature of solvent on the grafting reaction of maleic anhydride onto polyethylene wax obtained as a by-product in a high density polyethylene plant. The results show that the grafting ratio in xylene as a solvent was higher than toluene. This is because xylene has excellent monomer solubility, swelling property and miscibility. It has been also observed that grafting degree shows an initial jump in percentage of grafting with increasing amount of solvent, from 0% v/w to 200% v/w giving maximum grafting in 200% v/w and then slightly decreases on further increase in the amount of solvent and becomes almost constant. It can be also seen that gel content was not formed under the use of solvent. It means that solvent prevented cross-linking reaction due to chain transfer reactions to solvent molecules. Studies of melt viscosity at $140^{\circ}C$ showed that viscosity increased after grafting of maleic anhydride onto polyethylene wax.

본 연구에서는 고밀도 폴리에틸렌 제조공정에서 부산물로 생성되는 폴리에틸렌 왁스를 대상으로 무수말레인산을 그라프트 반응 시킬 때, 반응 용매가 가지는 성질의 영향에 대해서 조사하였다. 측정결과, 자일렌이 톨루엔보다 우수한 모노머 용해성, 팽윤성, 혼화성을 가지며, 그라프트 반응을 더욱 촉진함을 알 수 있었고, 반응 용매의 함량에 따라서는 0 ~ 200% v/w영역에서 200% v/w 조건이 최대의 그라프트 율을 보이고, 그이상의 용매가 사용될 경우에는 그라프트 율이 다시 감소하다가 일정해짐을 확인하였다. 가교도 함량 값은 용매 존재 하에 거의 생성되지 않았으며, 용매가 용매분자로 사슬이동반응 시켜 가교반응을 방지하는 것으로 판단되었다. $140^{\circ}C$에서 측정된 용융 점도 값은 폴리에틸렌 왁스에 무수말레인산이 그라프트 된 후에 증가하는 경향을 보임을 알 수 있었다.

Keywords

References

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  1. 스타이렌-무수말레인산 그래프트 반응에 의한 폴리에틸렌 왁스의 극성 특성 향상 vol.42, pp.4, 2014, https://doi.org/10.7317/pk.2018.42.4.539