Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Viscoelastic Properties of MF/PVAc Hybrid Resins as Adhesive for Engineered Flooring by Dynamic Mechanical Thermal Analysis

  • Kim, Sumin (Lab. of Adhesion & Bio-Composites, Major in Environmental Materials Science, Seoul National University) ;
  • Kim, Hyun-Joong (Lab. of Adhesion & Bio-Composites, Major in Environmental Materials Science, Seoul National University) ;
  • Yang, Han-Seung (Wood Materials and Engineering Laboratory, Washington State University)
  • Received : 2005.10.14
  • Accepted : 2005.11.16
  • Published : 2006.03.25
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Abstract

The viscoelastic properties of blends of melamine-formaldehyde (MF) resin and poly(vinyl acetate) (PVAc) for engineered flooring used on the Korean traditional ONDOL house floor heating system were investigated by dynamic mechanical thermal analysis (DMTA). Because MF resin is a thermosetting adhesive, the effect of MF rein was shown across all thermal behaviors. The addition of PVAc reduced the curing temperature. The DMTA thermogram of MF resin showed that the storage modulus (E') increased as the temperature was further increased as a result of the cross-linking induced by the curing reaction of the resin. The storage modulus (E') of MF resin increased both as a function of increasing temperature and with increasing heating rate. From isothermal DMTA results, peak $T_{tan{\delta}}$ values, maximum value of loss modulus (E") and the rigidities (${\Delta}E$) of MF/PVAc blends at room temperature as a function of open time, peak $T_{tan{\delta}}$ and maximum loss modulus (E") values were found to increase with blend MF content. Moreover, the rigidities of the 70:30 and 50:50 MF/PVAc blends were higher than those of the other blends, especially of 100% PVAc or MF. We concluded that blends the MF/PVAc blend ratios correlate during the adhesion process.

Keywords

Acknowledgement

Supported by : Agricultural Research & Development Center (ARPC)

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