Abstract
Twaron fibres, spun from poly(p-phenylene terphthalamide), were environmentally treated by four different procedures: thermal-ageing of the fibres at 150 C from 3 to 100 days, thermal ageing of the fibres at 300 C between 6 and 120 hours, exposing the fibers to direct sunshine for 100 to 800 hours, and exposing another set of samples to visible light by transmitting sunshine through glass sheets in order to absorb ultraviolet spectrum for 100 to 800 hours. Morphology of samples were then characterized quantitatively by x-ray diffraction for determination of crystallinity, microparacrystal (mPC) sizes, and net plane spacings. Mechanical properties were also characterized quantitatively in terms of initial Young`s modulus, ultimate stress and ultimate strain at the point of failure. Attempts have also been made to find out structure-properties relationships. Crystallinity of untreated sample was 82% and no practical variation in crystallinity was detected after ageing at 150 or 300 C. The microparacrystal lateral sizes D{sub 1}10 and D{sub 2}00 are ageing time dependent, and increase gradually with time. An increase of 21% was detected after 48 days at 150 C, and approximately 50% after 72 hours of ageing at 150 C. Exposure to direct sunshine or visible light caused no loss
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Citation Formats
Al-Khatib, N A.
Environmental effects on the structure and mechanical properties of twaron fibres.
Jordan: N. p.,
1992.
Web.
Al-Khatib, N A.
Environmental effects on the structure and mechanical properties of twaron fibres.
Jordan.
Al-Khatib, N A.
1992.
"Environmental effects on the structure and mechanical properties of twaron fibres."
Jordan.
@misc{etde_10134918,
title = {Environmental effects on the structure and mechanical properties of twaron fibres}
author = {Al-Khatib, N A}
abstractNote = {Twaron fibres, spun from poly(p-phenylene terphthalamide), were environmentally treated by four different procedures: thermal-ageing of the fibres at 150 C from 3 to 100 days, thermal ageing of the fibres at 300 C between 6 and 120 hours, exposing the fibers to direct sunshine for 100 to 800 hours, and exposing another set of samples to visible light by transmitting sunshine through glass sheets in order to absorb ultraviolet spectrum for 100 to 800 hours. Morphology of samples were then characterized quantitatively by x-ray diffraction for determination of crystallinity, microparacrystal (mPC) sizes, and net plane spacings. Mechanical properties were also characterized quantitatively in terms of initial Young`s modulus, ultimate stress and ultimate strain at the point of failure. Attempts have also been made to find out structure-properties relationships. Crystallinity of untreated sample was 82% and no practical variation in crystallinity was detected after ageing at 150 or 300 C. The microparacrystal lateral sizes D{sub 1}10 and D{sub 2}00 are ageing time dependent, and increase gradually with time. An increase of 21% was detected after 48 days at 150 C, and approximately 50% after 72 hours of ageing at 150 C. Exposure to direct sunshine or visible light caused no loss in crystallinity, but increased the mPC size by 10% in direct sunshine and 20% in visible light after 600 hours of exposure. Initial Young`s modulus of treated samples retained over 90% of the modulus of the untreated fibre regardless of the type of treatment (ageing or irradiation). The tensile strength retention and elongation at break retention varied according to the treatment, decreasing at 300 C more than at 150 C. The retention was over 60% after 800 hours of exposure to sunshine.}
place = {Jordan}
year = {1992}
month = {Jun}
}
title = {Environmental effects on the structure and mechanical properties of twaron fibres}
author = {Al-Khatib, N A}
abstractNote = {Twaron fibres, spun from poly(p-phenylene terphthalamide), were environmentally treated by four different procedures: thermal-ageing of the fibres at 150 C from 3 to 100 days, thermal ageing of the fibres at 300 C between 6 and 120 hours, exposing the fibers to direct sunshine for 100 to 800 hours, and exposing another set of samples to visible light by transmitting sunshine through glass sheets in order to absorb ultraviolet spectrum for 100 to 800 hours. Morphology of samples were then characterized quantitatively by x-ray diffraction for determination of crystallinity, microparacrystal (mPC) sizes, and net plane spacings. Mechanical properties were also characterized quantitatively in terms of initial Young`s modulus, ultimate stress and ultimate strain at the point of failure. Attempts have also been made to find out structure-properties relationships. Crystallinity of untreated sample was 82% and no practical variation in crystallinity was detected after ageing at 150 or 300 C. The microparacrystal lateral sizes D{sub 1}10 and D{sub 2}00 are ageing time dependent, and increase gradually with time. An increase of 21% was detected after 48 days at 150 C, and approximately 50% after 72 hours of ageing at 150 C. Exposure to direct sunshine or visible light caused no loss in crystallinity, but increased the mPC size by 10% in direct sunshine and 20% in visible light after 600 hours of exposure. Initial Young`s modulus of treated samples retained over 90% of the modulus of the untreated fibre regardless of the type of treatment (ageing or irradiation). The tensile strength retention and elongation at break retention varied according to the treatment, decreasing at 300 C more than at 150 C. The retention was over 60% after 800 hours of exposure to sunshine.}
place = {Jordan}
year = {1992}
month = {Jun}
}