Article
  • Mechanical Properties of Rubbers Reinforced with Nylon Short Fiber
  • Chung TY, Moon CK, Cho HH, Lee JK, Lee JO
  • 나일론 단섬유 강화고무의 기계적 성질
  • 정력용, 문창권, 조현혹, 이진국, 이장우
Abstract
Both mechanical properties and dynamic viscoelastic properties of composites of short nylon fiber (at a loading of 10 phr) and NR or EPDM rubber have been measured and the effect of the surface treatment of the fiber with resorcinol-formaldehyde latex (RFL) bonding agent on the properties has been analysed. Some improvement in mechanical properties (tensile strength and elongation at break) has been observed owing to the RFL treatment of fiber, the tendency being more pronounced in case of NR(polar) composite than the EPDM(nonpolar) case, as expected from the state of interfacial bonding between fiber and matrix through SEM observation. From the measurements of temperature dispersions of the shear storage and loss moduli, G'' and G'''', and the mechanical damping, tan δ, for nylon-NR and nylon-EPDM composites with unidirectional short fibers, we have found that the values of G'' have slightly increased by the RFL treatment for both cases. In addition, the tan δ curve exhibited two main peaks corresponding to the respective glass transition temperatures (Tg''s) of rubber and fiber, characteristic of a hetero-geneous system : in particular, an additional peak at a temperature between two peaks has been observed for the NR composite probably due to the relaxation of the interface region between fiber matrix.

Matrix로서 합성 고무인 ethylene-propylene-diene terpolymer (EPDM)와 천연고무인 standard Malaysia rubber (SMR CV5O) (이하 NR)을 강화섬유로서는 나일론 섬유 (L/D=36)를 선택하여 섬유함량을 10phr (parts per hundred)로 고정하여 복합재료를 만들었으며, 섬유표면에 resorcinol-for-maldehyde latex (RFL)로 처리한 효과가 복합재료의 기계적 성질 및 동적 점탄성에 미치는 영향을 검토하였다. 강화섬유인 나일론 섬유표면에 RFL처리를 한 경우가 기계적성질이 향상되었고, 그 효과는 EPDM보다 천연고무쪽이 뚜렷하였으며, 이러한 이유를 SEM으로 섬유와 고무계면의 접착 상태로 확인할 수 있었다. 복합재료의 온도에 따른 동적 점탄성(G'')을 측정한 결과, G''도 RFL처리를 한 경우가 보다 큰 값을 나타내었으며, tan δ의 값은 각 matrix에 대하여 비상용계의 특징인 고무 및 섬유의 유리전이온도(Tg)에 해당하는 peak를 나타내었다. 또한 천연고무의 경우에는 RFL 처리에 따른 증가된 계면 접착력의 효과로 명확하지는 않으나 제3의 peak같은 것이 관측되었다.

Keywords:

  • 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

  • 1990; 14(3): 203-210

    Published online Jun 25, 1990

  • 10.7317/pk.
  • Received on Nov 30, -0001
  • Revised on Nov 30, -0001
  • Accepted on Nov 30, -0001

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