Formation of linear polyenes in poly(vinyl alcohol) films catalyzed by phosphotungstic acid, aluminum chloride, and hydrochloric acid

Третинников, О. Н.; Sushko, N. I.; Malyi, A. B.

doi:10.1134/s0030400x16070225

Cited by 4 publications

(2 citation statements)

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“…Hydrogen chloride (HCl) has been used to promote the curing and dehydration of hydroxyl group‐containing polymers . For example, an effective way to cure spun novolac (phenol formaldehyde) fibers is to heat them in a liquid or gaseous formaldehyde environment in the presence of HCl to catalyze crosslinking reaction of phenolic fibers .…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen chloride (HCl) has been used to promote the curing and dehydration of hydroxyl group-containing polymers. [16][17][18][19] For example, an effective way to cure spun novolac (phenol formaldehyde) fibers is to heat them in a liquid or gaseous formaldehyde environment in the presence of HCl to catalyze crosslinking reaction of phenolic fibers. 16,17 For the pyrolysis of furfuryl alcohol and furfuryl-furfuryl resins alcohol resins, HCl atmosphere promotes the dehydration and increases the carbon yield.…”

Section: Introductionmentioning

confidence: 99%

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Lignin‐based carbon fibers: Accelerated stabilization of lignin fibers in the presence of hydrogen chloride

Yue

Vakili

Hosseinaei

et al. 2017

J of Applied Polymer Sci

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Organosolv switchgrass lignin (SGL) and hardwood lignin (HWL) polymers are used as precursors to prepare low cost carbon fibers (CFs). Lignin powder and fiber samples are stabilized and carbonized at different conditions to investigate the effect of HCl on thermal‐oxidative stabilization time, mass yield, fiber diameter, and mechanical properties. The results show that HCl can accelerate stabilization and reduce the stabilization time from many hours to 75 min for the SGL fibers, and to 35 min for the HWL fiber. The rate of rapid stabilization in HCl/air is at least four times faster than conventional stabilization in air. The CFs prepared with two different stabilization methods have almost the same strength and modulus, but higher carbon yield is obtained with the rapid stabilization due to a short time of oxidation. Pores and defects observed on the surface and the cross‐section of the CFs across all stabilization conditions contribute to low fiber strength. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45507.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%