The formulations of all NR/NBR compounds are shown
in Table 1. 50/50 NR/NBR blends containing the CNT/NR
masterbatches prepared from the predispersing and conventional
methods were denoted as “P” and “C”, respectively.
The number following the letters indicates the
amount of CNT in the blends. Each CNT/NR masterbatch
and other ingredients, except the curatives, were mixed
with NBR by using a laboratory-size internal mixer (Brabender
Plasticorder R2000; Brabender, Duisburg, Germany)
at a temperature of 50 C, a rotor speed of 50 rpm
and a fill factor of 0.7. The total mixing time was 8 min.
After discharging, the compoundwas sheeted on a two rollmill
(LRM150; Labtech engineering Co., Ltd., Samutprakarn,
Thailand) for 1 min. Then, the curatives were added and
mixed for 5 min. Thereafter, 10 end-roll passes were made.
Later, cure characteristics of all compounds were determined
by using a moving die rheometer (TechPro rheotech
MDþ; Alpha Technologies, Ohio, USA) at 150 C. Then, the
compounds were vulcanized at 150 C in a compression
mold according to their cure time (tc100) to produce sheets
and test pieces which were stored at room temperature for
at least 24 h before determination of properties.
The formulations of all NR/NBR compounds are shownin Table 1. 50/50 NR/NBR blends containing the CNT/NRmasterbatches prepared from the predispersing and conventionalmethods were denoted as “P” and “C”, respectively.The number following the letters indicates theamount of CNT in the blends. Each CNT/NR masterbatchand other ingredients, except the curatives, were mixedwith NBR by using a laboratory-size internal mixer (BrabenderPlasticorder R2000; Brabender, Duisburg, Germany)at a temperature of 50 C, a rotor speed of 50 rpmand a fill factor of 0.7. The total mixing time was 8 min.After discharging, the compoundwas sheeted on a two rollmill(LRM150; Labtech engineering Co., Ltd., Samutprakarn,Thailand) for 1 min. Then, the curatives were added andmixed for 5 min. Thereafter, 10 end-roll passes were made.Later, cure characteristics of all compounds were determinedby using a moving die rheometer (TechPro rheotechMDþ; Alpha Technologies, Ohio, USA) at 150 C. Then, thecompounds were vulcanized at 150 C in a compressionmold according to their cure time (tc100) to produce sheetsand test pieces which were stored at room temperature forat least 24 h before determination of properties.
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