Recycling of high impact polystyrene in coextruded sheet: influence of the number of processing cycles on the microstructure and macroscopic ... article from: Polymer Engineering and Science
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Publisher
Thomson Gale
ISBN / ASIN
B000M8NIO0
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978B000M8NIO4
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This digital document is an article from Polymer Engineering and Science, published by Thomson Gale on December 1, 2006. The length of the article is 4137 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: High impact polystyrene(HIPS) was repeatedly coextruded at 220[degrees]C, maintaining a constant composition of 70 wt% of virgin HIPS and 30 wt% of recycled HIPS. The gel content (GC), grafting degree (GD), swell index (SI), morphology of the rubber phase, and average molecular weight of the polystyrene (PS) matrix ([bar.M.sub.w]) were characterized after each processing cycle. The effect of these parameters on the melt flow index (MFI), the shear viscosity ([eta]), the power law index (n), the Izod impact, and the stress at break were evaluated. The results demonstrated that the rheological properties changed with the number of processing cycles, e.g. the MFI decreased in the first cycle from 2.8 to 1.7 g/10 min, while from the second to the sixth cycle increased to 3.4 [+ or -] 0.2 g/10 min. The power law index increased from n = 0.29, after the first processing cycle, to n = 0.34 in the sixth cycle. The changes in MFI and n were attributed to changes in the physical structure of the rubber phase and to chain scissions in the PS matrix, caused by the recycling. Finally, the impact strength decreased with the increasing number of processing cycles, while the tensile stress at break remained constant. POLYM. ENG. SCI., 46:1698-1705, 2006. [c] 2006 Society of Plastics Engineers
Citation Details
Title: Recycling of high impact polystyrene in coextruded sheet: influence of the number of processing cycles on the microstructure and macroscopic properties.
Author: Florentino Soriano
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: December 1, 2006
Publisher: Thomson Gale
Volume: 46 Issue: 12 Page: 1698(8)
Distributed by Thomson Gale
From the author: High impact polystyrene(HIPS) was repeatedly coextruded at 220[degrees]C, maintaining a constant composition of 70 wt% of virgin HIPS and 30 wt% of recycled HIPS. The gel content (GC), grafting degree (GD), swell index (SI), morphology of the rubber phase, and average molecular weight of the polystyrene (PS) matrix ([bar.M.sub.w]) were characterized after each processing cycle. The effect of these parameters on the melt flow index (MFI), the shear viscosity ([eta]), the power law index (n), the Izod impact, and the stress at break were evaluated. The results demonstrated that the rheological properties changed with the number of processing cycles, e.g. the MFI decreased in the first cycle from 2.8 to 1.7 g/10 min, while from the second to the sixth cycle increased to 3.4 [+ or -] 0.2 g/10 min. The power law index increased from n = 0.29, after the first processing cycle, to n = 0.34 in the sixth cycle. The changes in MFI and n were attributed to changes in the physical structure of the rubber phase and to chain scissions in the PS matrix, caused by the recycling. Finally, the impact strength decreased with the increasing number of processing cycles, while the tensile stress at break remained constant. POLYM. ENG. SCI., 46:1698-1705, 2006. [c] 2006 Society of Plastics Engineers
Citation Details
Title: Recycling of high impact polystyrene in coextruded sheet: influence of the number of processing cycles on the microstructure and macroscopic properties.
Author: Florentino Soriano
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: December 1, 2006
Publisher: Thomson Gale
Volume: 46 Issue: 12 Page: 1698(8)
Distributed by Thomson Gale
