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.
11 also show that the proportion of large size polymeric components slightly increased after multiple reprocessing, a similar effect (but to a lesser extent) to that seen for single recycling of ABS2 at 270[degrees]C.
There are several large peaks in the chromatogram of the ABS2 'before reprocessing' sample (Fig.
This mirrors the situation found during reprocessing of 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.
In ABS2, tensile strength fell by 10% to 15% in the range where the highest Izod impacts were observed.
A slight increase in HDT was observed for ABS2 with the addition of 4 pph of 400-mw polybutene.