Authors: Shuangmei Zhang Huixian Zhang Weiyi Zhang Zhiqiang Wu Feng Chen Qiang Fu
Publish Date: 2014/05/22
Volume: 32, Issue: 7, Pages: 823-833
Abstract
In this study four hydroxylterminated polydimethylsiloxanes PDMSOH with different viscosities and hydroxyl contents were used to improve the toughness of polycarbonate PC through reactive melt blending A largely improved toughness of PC has been achieved and the low temperature toughness of PC/PDMSOH blends could overtake that of PC homopolymer in much higher temperatures eg −10 °C versus 23 °C Moreover it was found that the more the hydroxyl content the less the PDMSOH was needed to reach the highest toughness suggesting that equivalent molar ratio between the carbonyl group content of PC and the hydroxyl group content of PDMSOH was required for the toughening of PC Ultraviolet spectrophotometry was used to analyze the possible reaction between PC and PDMSOH Contact angle was measured to assess the change of interfacial interaction between PC and PDMSOH as change of viscosity and hydroxyl content The formation of PCcoPDMSOH copolymer was believed to be the key for the toughening effect This work gives a profound recommendation of the optimum kind and dosage of PDMSOH which should be used to improve the toughness of PC and will find immediate industrial applications
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