Abstract
This paper focuses on the influence of glycidyl methacrylate functionalized polyolefin elastomer (SOG-03) on the properties of PC/PBT alloys, and also made a contrastive analysis with ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMA-co-GMA) and methyl methacrylate-butadiene-styrene terpolymer (MBS), the common toughener in PC/PBT alloy. The impact performance test results of PC/PBT alloys with different addition of SOG-03 showed that the brittle-ductile transition began when SOG-03 content reached 3 wt%. The microstructure, differential scanning calorimeter (DSC) and multi-extrusion process results of PC/PBT alloys all showed that SOG-03 tends to be dispersed in PBT phase and the dispersed SOG-03 presents typical rubber-toughened polymer morphology. The toughening efficiency of MBS on PC/PBT alloy was much lower than EMA-co-GMA and SOG-03, and showed a worse processing stability after multi-extrusion process and long-term thermal ageing properties. The EMA-co-GMA and SOG-03 toughened PC/PBT alloys showed an equivalent toughness, while the PC/PBT alloy with SOG-03 showed a better processing stability during the multi-extrusion process and long-term thermal ageing property when the thermal aging time is more than 600 h.
Highlights
Polycarbonate (PC) is a kind of typical amorphous polymer with good mechanical property, heat resistance and electrical property, especially outstanding impact performance, which ranks first in engineering plastics
This paper focuses on the influence of glycidyl methacrylate functionalized polyolefin elastomer (SOG-03) on the properties of PC/PBT alloys, and made a contrastive analysis with ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMA-co-GMA) and methyl methacrylate-butadiene-styrene terpolymer (MBS), the common toughener in PC/PBT alloy
The impact fracture surface of PC/PBT alloys with different tougheners under different magnification were added (as shown in Figures 3(b)-(d)), the results showed the enlarged impact section (Figure 3(b)) of PC/PBT alloy added with EMA-co-GMA was rough while that added with MBS was very smooth (Figure 3(d)), and neither impact section could help judge dispersion of tougheners in PC/PBT-0 PC/PBT-1 PC/PBT-3 PC/PBT-5 PC/PBT-7
Summary
Polycarbonate (PC) is a kind of typical amorphous polymer with good mechanical property, heat resistance and electrical property, especially outstanding impact performance, which ranks first in engineering plastics. Simple melt blending will cause phase separation that contributes to poor impact toughness and limits the application of PC/PBT alloy. Choosing proper toughening compatibilizer is crucial for preparing PC/PBT alloy with good property. A new type of POE-g-GMA product (SOG-03) was employed as toughening compatibilizers in PC/PBT alloy, which improves the shortcomings of large odor and high residual monomer content in the production of traditional POE-g-GMA by the reactive extrusion process. The transesterification in the process of blending PC/PBT alloy is a significant factor for deteriorating properties of composite material. The PC/PBT alloys prepared in this work were added with 0.3 wt% anhydrous sodium dihydrogen phosphate as a transesterification inhibitor
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