Effect of temperature on the release of volatile and odorous compounds in flax fibers

Abstract

The behavior of flax fibers was investigated at temperatures of 80 °C, 200 °C, 215 °C, and 230 °C for a period of 60 min. First, thermogravimetric and colorimetric analyzes were carried out to characterize the impact of the temperature on the weight loss and the color of the fibers. Then, the release of volatile and odorous compounds from flax fibers was studied using both chemical and sensory approaches. Solid phase micro extraction was done to isolate the volatile organic compounds (VOCs) from the headspace of the sample while gas chromatography‐mass spectrometry (GC‐MS) and olfactometry (O) were used to determine the volatile and odorous compounds released at each temperature. About 24 VOCs were identified in the volatile fraction of flax fibers with a high occurrence of aliphatic aldehydes, phenols, and furans. Quantification by GC‐MS and by the aroma extract dilution analysis method was implemented. The results point to a critical temperature between 215 °C and 230 °C from which the odor of flax fibers becomes more intense, more complex, and with unpleasant features. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43497.

Understanding of the residual odour of fatty esters used as emollient in cosmetic products

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“…Seven perceptions do not correspond to any of the peaks of ethyl oleate chromatogram and thus cannot be assigned to a compound. It is very common for this type of analysis [21,23] and it usually corresponds to compounds with low detection thresholds.…”

The effects of the metal pigment, adsorbent, extractant and their feeding methods on the properties of polycarbonate/acrylonitrile–butadiene–styrene composites

“…In these previous studies, the individual effects of processing technology, extractant and adsorbent on the odour, VOC and condensable substances (FOG) of plastic, or at most, a combination of two of them were considered. 13,[23][24][25][26][27] Recently, we focused our research on metallic glossy plastics and the combined effects of processing technology, extractants, and adsorbents on VOC, FOG and odour, and obtained some unexpected results. The most important result was that when the extractant and adsorbent were used at the same time, the method of adding the extractant and adsorbent from the main and the secondary feeding port, respectively, was superior to adding the extractant and adsorbent together from the main feeding port in reducing the VOC, FOG and odour of PC/ABS composites, which displayed good synergistic effects.…”

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“…In these previous studies, the individual effects of the processing technology, extractant and adsorbent, or, at most, a combination of two of them, were considered [14,21,24,26]. Recently, we focused our research on metal textured plastics and the combined effects of the processing technology, extractant and adsorbent on the VOC and odor, and obtained a very effective way to prepare polymer composites with low odor and low VOC.…”