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GuoY.the (final comments 2).pdf (1.04 MB)
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Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires
Author Info
Guo, Yingmin
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=akron1462533895
Abstract Details
Year and Degree
, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
Abstract
The ultrasonic devulcanization of ground tire rubber (GTR) of 40 meshes using an ultrasonic twin-screw extruder was studied. The die pressure and ultrasonic power consumption were recorded during the process of devulcanization. Devulcanization was carried out at a frequency of 40 kHz and ultrasonic amplitudes at 0 µm and 8 µm. The gel fraction, crosslink density, and revulcanization behavior were studied to investigate the degree of devulcanization. After devulcanization, untreated ground tire rubber (UTR) powder, ground tire rubbers devulcanized at 0 µm (DTR 0 µm) and 8 µm (DTR 8 µm) were blended with natural rubber (NR) at ratios of 100/0, 50/50, 35/65, 20/80, 10/90, and 0/100. In order to reinforce these blends, carbon black (CB) was added to GTR/NR to the CB content in NR equals to GTR. Rheological properties, curing behavior, mechanical properties and abrasion loss of revulcanized rubbers were measured. Revulcanized tire rubber at 8 µm with natural rubber (RTR 8 µm/NR) had better mechanical properties and lower abrasion loss than revulcanized tire rubber at 0 µm with natural rubber (RTR 0 µm/NR) at all blending ratios. Lower gel fraction of DTR 0 µm and DTR 8 µm compared with UTR indicated devulcanization of GTR at 0 µm and 8 µm. RTR 0 µm/NR and RTR 8 µm/NR vulcanizates exhibited higher tensile strength and elongation at break than those vulcanizates presence from mixture of UTR and NR (RUTR/NR), but lower modulus at 100% elongation and lower abrasion loss. The addition of CB to blends improved modulus at 100% elongation, tensile strength and abrasion properties significantly, but decreased elongation at break compared with blends without CB. The differences in rheological and mechanical properties of RUTR/NR/CB, RTR 0 µm/NR/CB and RTR 8 µm/NR/CB blends decreased compared to those of RUTR/NR, RTR 0 µm/NR and RTR 8 µm/NR blends.
Committee
Avraam Isayev (Advisor)
Subject Headings
Polymers
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Citations
Guo, Y. (n.d.).
Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires
[Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462533895
APA Style (7th edition)
Guo, Yingmin.
Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires.
University of Akron, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=akron1462533895.
MLA Style (8th edition)
Guo, Yingmin. "Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires." Master's thesis, University of Akron. Accessed MARCH 28, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462533895
Chicago Manual of Style (17th edition)
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Document number:
akron1462533895
Download Count:
1,524
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This open access ETD is published by University of Akron and OhioLINK.