ABS1 and ABS2 were used to assess the effects on impact and tensile properties respectively, of reprocessing in the torque rheometer at different temperatures and rotational speeds (shear rates).
Some broken samples of ABS2 and granulated particles of ABS3, which had undergone thermal reprocessing 0, 1, 2, or 3 times in the torque rheometer, but had not been injection molded, were used for identification.
Absorbance ratios for different bands in the FTIR spectra of ABS1 and ABS2 are shown in Fig.
Similar trends were observed in the equivalent chromatograms of ABS2.
The proportion of large size components increased slightly after reprocessing at the highest temperature of 270[degrees]C, but the increase in the high molecular weight component was greater in ABS2 than ABS1 (Figs.
5 pph, or approximately equal to the rubber phase), could be incorporated into ABS2.
Only select samples of ABS2 were evaluated for heat distortion temperature (HDT) and low-temperature Izod impact strength, to determine any effects.
At levels as low as 2 pph, polybutene increased impact strength of ABS2 by more than 20%.
Low-temperature (-40 [degrees] C) notched Izod impact properties were determined for ABS1 and selected samples of ABS2, as shown in Fig.
3 shows, melt flow rate of ABS2 increases with addition of the 400-mw and 950-mw polybutenes.