Article
  • Mechanical Properties of Rubber Compounds Containing the Polynorbonene-Type- ulcanizate Powder
  • Nah C, Cho S, Lee KJ, Jeon DJ, Cho CT, Kang S
  • 폴리노르보넨계 가황분말 함유 고무컴파운드의 기계적 특성
  • 나창운, 조선이, 이계정, 전대진, 조춘택, 강신영
Abstract
Various mechanical properties Including tensile strength of natural rubber (NR) and polybutadiene (PB) containing 10 phr of polynorbonene (PN)-vulcanizate- powder with the particle size ranging from 50 to 600 μm (average : 300 μm) were investigated. The amount of PN powder was varied up to 40 phr in order to investigate the effect of PN level on the properties of the carbon black-filled-natural rubber (FNR). Tensile fracture surface was observed using a scanning electron microscopy (SEM) in order to interprete the findings in the tensile test. The rate of cure of the rubber compounds increased but maximum torque decreased with adding PN powder. Addition of PN powder into PB rubber compound having lower tensile strength did not give any big changes in the tensile strength. However, in the case of NR compound which is stronger In tensile strength than the PN powder, the tensile strength decreased significantly with adding PN powder. The observed result was explained by two different fracture mechanisms found through the investigation of fracture surfaces. Typical 'Schallamach pattern' was observed and the surfaces among the ridges were found to be rougher as the PN powder was added. In the case of FNR compound, glass transition temperature, Tg stayed constant, tan δbetween 0∼70℃ and heat build-up increased and rebound decreased as the PN powder loading was increased. Skid resistance of FNR compound on a wet concrete at room temperature was found to be unaffected by the PN powder level of up to 40 phr.

폴리노르보넨계 가황분말(PN 분말)을 50∼600μm(평균 : 300μm) 범위의 크기로 제조하여 천연고무(NR)와 polybutadiene 고무(PB) 컴파운드에 약 10phr 정도 첨가하였고, PN 분말 첨가에 따른 인장강도를 비롯한 여러가지 기계적 특성을 조사하였다. 특히 카폰블랙이 보강된 천연고무(FNR)에 대해서는 PN 분말의 함량을 약 40phr까지 변량하여 그 영향을 조사하였다. 인장파괴 표면을 전자현미경 (SEM)을 이용하여 관찰하였고 PN 분말 첨가에 따른 인장특성 결과를 해석하였다. PN 분말 첨가에 따라 각 배합고무의 가황속도는 빨라지고, 최대 토오크는 낮아졌다. PN 자체의 인장강도보다 낮은 PB 고무에 PN 분말을 첨가하면 인장강도의 큰 변화가 관찰되지 않은 반면, PN보다 강도가 높은 NR에 첨가할 경우 인장강도는 크게 하락하였다. 이것은 인장 파괴단면의 관찰결과 두 배합고무에 있어서 서로 다른 인장파괴 메카니즘의 결과로 해석되었다. 마모표면은 전형적인 'Schallamach pattern'을 나타내었고 PN 분말 첨가에 따라 ridge-ridge간 표면이 더욱 거칠게 변하였다. PN 분말의 함량을 40phr 까지 증가시킴에 따라 FNR 배합고무의 유리전이온도, Tg는 거의 영향을 받지 않았으며, 0∼70℃ 범위에서의 tan δ와 발열특성은 증가하였고, 반발탄성은 감소하였다. 젖은 콘크리트 노면에서의 FNR 배합고무의 미끄럼 저항성은 상온에서 크게 증가하지 않았다.

Keywords: polynorbonene; unlcanizatepowder; mechanical property; natural rubber; polybutadiene

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1996; 20(4): 547-557

    Published online Jul 25, 1996