Article
  • A Study on the Preparation of UPE Resins with Different Glycol Molar Ratios and Their Physical Properties: 2. Characteristics of Liquid and Cured UPE Resins
  • Lee SH, Park TW, Lee JO
  • 글리콜 몰비가 다른 불포화 폴리에스테르 수지의 제조 및 물성에 관한 연구 : 2. 글리콜 종류에 따른 UPE 액상 및 경화 수지의 특성
  • 이상효, 반천욱, 이장우
Abstract
In order to improve the mechanical properties of unsaturated polyester(UPE) resins, the UPE resins were fabricated using various glycols and characterized before and after curing. The UPE resins were prepared by condensation of mixtures(1 : 1 molar ratio) of phthalic anhydride(PA) and maleic anhydride(MA) with ethylene glycol(EG), propylene glycol(PG), deithylene glycol (DEG), dipropylene glycol (DPG), neopentyl glycol (NPG). The reactivity of the condensation was in the order of NPG>EG>DEG>PG>DPG. The opaque UPE resin with EG revealed phase separation in styrene monomer (SM) because of low solubility. Viscosities of the UPE resins decreased with increasing molecular weights of the glycols used. The UPE cured resins based on NPG and PG were found to improved hardness, water resistance, tensile strength and the flexural strength. The UPE resins of DEG or EG showed poor water resistance and low tensile elongation. Among the UPE resins prepared from various kinds of glycols, those of NPG and PG showed better mechanical properties.

불포화 폴리에스테르 (unsaturated polyester : UPE) 수지의 기계적 물성을 증진시킬 목적으로서 서로 다른 글리콜을 이용하여 UPE 수지를 제조하였다. 글리콜로서 ethylene glycol (EG), propylene glycol (PG), diethylene glycol (DEG), dipropylene glycol (DPG), neopentyl glycol(NPG)와 산무수물로서 무수프탈산 (phthalic anhydride : PA)과 무수말레산 (maleic anhydride : MA) 혼합물 (1 : 1 몰비)의 축중합으로 다양한 UPE 수지를 제조하여 액상 및 경화 수지의 물성을 조사하였다. 반응성은 NPG>EG>DEG>PG>DPG의 순이었으며, EG로 제조된 UPE수지는 스티렌 단량체 (SM)에 대한 용해력 부족으로 불투명하고, 실온에서 저장중 분리현사이 발생하였다. 사용된 글리콜의 분자량이 높을수록 UPE 수지의 점도는 낮아졌고 경화시간은 증가하는 경향을 보였다. 경화 수지의 물성 결과로 NPG와 PG로 제조된 UPE 수지는 표면경도, 내수성, 인장강도. 굴곡강도가 우수한 반면 DEG와 EG로 된 UPE 수지는 내수성 및 인장신율이 떨어지는 것으로 나타났다. NPG와 PG로 제조된 UPE 수지의 기계적 물성이 우수한 것으로 관찰되었다.

Keywords: unsaturated polyester; viscosity; water resistane; mechanical properties

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  • 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

  • 1999; 23(6): 773-780

    Published online Nov 25, 1999