Cotton fiber alignment and its effect on properties of HNBR vulcanizates: Influences of scorch behavior, flow distance, and injection pressure
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Author list: Sanprasert P., Sombatsompop N., Sae-Oui P., Sirisinha C.
Publisher: American Chemical Society -- Rubber Division
Publication year: 2016
Journal: Rubber Chemistry and Technology (0035-9475)
Volume number: 89
Issue number: 3
Start page: 436
End page: 449
Number of pages: 14
ISSN: 0035-9475
Languages: English-Great Britain (EN-GB)
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Abstract
Injection molding of cotton fiber-filled HNBR is commonly used in the rubber industry.Amicroscopic technique was used to monitor level of fiber alignment as affected by varied scorch time, injection pressure, and flowdistance in mold cavity. The results obviously reveal an increase in thickness of orderly alignment layer of fiber when injection pressure and flow distance in mold cavity increase, attributed to the increased magnitude of shear strain. On the other hand, a disorderly alignment of fiber is found in the system having relatively long scorch time. The molecular relaxation process via strain recovery causes a misalignment of cotton fibers. Stress relaxation results exhibit an increasing tendency of residual stress when injection pressure and flow distance in mold increase while scorch time decreases. Unexpectedly, the increase in creep strain with increasing injection pressure and flow distance, in association with a decrease in scorch time, arises from poor filler-rubber interaction.
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