Co-toughened Polystyrene by Submicrometer-Sized Core鈥揝hell Rubber Particles and Micrometer-Sized Salami Rubber Particles

详细信息    查看全文

• 作者：Yunjiao Deng ; Guanghui Gao ; Zhenguo Liu ; Chunlei Cao ; Huixuan Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：April 10, 2013
• 年：2013
• 卷：52
• 期：14
• 页码：5079-5084
• 全文大小：331K
• 年卷期：v.52,no.14(April 10, 2013)
• ISSN：1520-5045

文摘

A series of submicrometer-sized polybutadiene (PB) rubber particles with different diameters ranging from 100 to 450 nm were prepared via an emulsion polymerization. Subsequently, core鈥搒hell polybutadiene-graft-polystyrene (PB-g-PS) particles were synthesized using a redox initiator system (cumene hydroperoxide and ferrous sulfate) by an emulsion grafting polymerization. Then the submicrometer sized PB-g-PS impact modifiers were utilized to toughen polystyrene (PS) by blending PS and high-impact polystyrene. From measuring mechanical properties, it was found that the notched impact strength of toughened PS was significantly influenced by core鈥搒hell PB-g-PS particle size. When the rubber particle size was above 300 nm, the notched impact strength was 208 J/m, nearly 2 times than that of toughened PS with particle size 100 nm. Moreover, the stress whitening zones were observed by transmission electron microscopy, and the result showed that multiple crazing is its dominative toughening mechanism.