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首页> 外文期刊>Journal of Applied Polymer Science >Compatibility, adhesional interaction of components, impact strength, and rheological behavior of polycarbonate/polycarbonate-siloxane block copolymer
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Compatibility, adhesional interaction of components, impact strength, and rheological behavior of polycarbonate/polycarbonate-siloxane block copolymer

机译：聚碳酸酯/聚碳酸酯-硅氧烷嵌段共聚物的相容性，组分的粘合相互作用，冲击强度和流变行为

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Polycarbonate (PC) blended with a polymer-modifier polycarbonate-polydimethylsiloxane (PC-PDMS) of polyblock structure having equal molar ratios of soft (PDMS) and hard (PC) blocks have been investigated. The kinetics of adhesional interaction in blends and the analysis of interphase interaction conducted by using the relaxation spectrometry showed that intensive interactions between phases can occur. At a concentration of the modifier less than or equal to 5 wt %, these effects can lead to a partial compatibility of the components. The phase separation comes to completion when PC-PDMS content reaches 7 to 10 wt %. Here the impact strength of the blends improves compared with homopolycarbonate; this factor becomes less sensitive to the notch pattern or surface defects. The micro-heterogeneous blends would fail by the multiple crazing mechanism. The mode of temperature vs impact strength relationship depends on the concentration of the modifier. Low shearing rates applied to the PC blends containing 3 to 7 wt % of PC-PDMS results in a lower melt flow index compared with that for a neat PC. The blends were more sensitive to shearing stresses than the homopolycarbonate. Therefore, they have lower viscosity at a high shearing rate than PC. Introduction of PC-PDMS into PC did not change its thermal stability significantly. The modifier inhibited the chemical crosslinking of PC chains if the melt had been kept for a long period. The optimal mechanical properties combined with improved processability were found in blends containing 7 to 10 wt % of PC-PDMS. (C) 2000 John Wiley & Sons, Inc. [References: 26]
机译：已经研究了将聚碳酸酯（PC）与具有相同摩尔比的软嵌段（PDMS）和硬嵌段（PC）的聚嵌段结构的聚合物-改性剂聚碳酸酯-聚二甲基硅氧烷（PC-PDMS）共混。共混物中粘附相互作用的动力学以及使用弛豫光谱法进行的相间相互作用的分析表明，相之间可能发生强烈的相互作用。在改性剂的浓度小于或等于5wt％时，这些作用可导致组分的部分相容性。当PC-PDMS含量达到7至10 wt％时，相分离完成。与均聚碳酸酯相比，共混物的冲击强度有所提高。这个因素对缺口图案或表面缺陷变得不太敏感。微异质共混物将由于多重裂纹机制而失效。温度与冲击强度关系的模式取决于改性剂的浓度。与纯PC相比，对包含3至7 wt％PC-PDMS的PC共混物施加的低剪切速率导致较低的熔体流动指数。该共混物比均聚碳酸酯对剪切应力更敏感。因此，它们在高剪切速率下的粘度低于PC。将PC-PDMS引入PC并没有显着改变其热稳定性。如果长时间保持熔融状态，改性剂会抑制PC链的化学交联。在含有7至10 wt％的PC-PDMS的共混物中，发现了最佳的机械性能和改善的加工性能。 （C）2000 John Wiley＆Sons，Inc. [参考：26]

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