ABS1Actin-Binding Site 1
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The room-temperature impact strength results obtained by modifying ABS1 with polybutene [ILLUSTRATION FOR FIGURE 1 OMITTED] show that a 30% improvement can be achieved using polybutenes of either 400 or 950 mw at levels of 4 to 7.
Low-temperature (-40 [degrees] C) notched Izod impact properties were determined for ABS1 and selected samples of ABS2, as shown in Fig.
In ABS1, the 400-mw polybutene did not change the MFR, and the 950-mw polybutene reduced MFR slightly.
Modification of ABS1 with 4 pph of polybutene resulted in a decrease of 5% to 9% in tensile strength.
The influence of polybutene on HDT was measured for ABS1 and select samples of ABS2.
The same trends were observed in the DMTA spectra of ABS1.
Absorbance ratios for different bands in the FTIR spectra of ABS1 and ABS2 are shown in Fig.
The results using the GPC column designed for assessing the smaller molecular species of ABS1 are shown in Fig.
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.