Quantification of polypropylene (PP) in wood plastic composites (WPCs) by analytical pyrolysis (Py) and differential scanning calorimetry (DSC)

Windt, Michael; Meier, Dietrich; Lehnen, Ralph

doi:10.1515/hf.2011.024

Cited by 23 publications

(14 citation statements)

References 43 publications

(57 reference statements)

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“…It is well known that chain scission occurs when PP is exposed to sunlight or high temperatures. Shorter mobile molecular chains will recrystallize at the initial stage, resulting in improved crystallinity and flexural properties . However, continuing chain scission will eventually damage PP and lead to MOR loss in WPCs .…”

Section: Resultsmentioning

confidence: 99%

Improving thermo‐oxidative degradation resistance of bamboo fiber reinforced polypropylene composite with antioxidants. Part I: Screening of antioxidants

Ren

Zhang

Wang

et al. 2016

J of Applied Polymer Sci

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In this study, the effect of antioxidant application (applied in different combinations, ratios and contents) on the thermo‐oxidative degradation resistance of bamboo fiber polypropylene composites (BFPCs) were investigated, with oxidative induction time (OIT), weight loss, surface color, and flexural mechanical properties as the main indicators for evaluation. The results showed the addition of antioxidants could greatly increase the OIT and reduce the weight loss and color change of the composites after 900 h of thermal weathering. Meanwhile, the flexural mechanical properties were little affected or even slightly improved. The combination of 1076 and DLTP antioxidants at a ratio of 2:1 and 0.2 wt % content was found to exhibit the best thermal oxidation resistance with respect to the OIT, mechanical properties and cost. Our study indicate that the OIT can serve as a simple and quick indicator for the evaluation of thermo‐oxidative resistance of BFPC. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44198.

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Section: Resultsmentioning

confidence: 99%

Improving thermo‐oxidative degradation resistance of bamboo fiber reinforced polypropylene composite with antioxidants. Part I: Screening of antioxidants

Ren

Zhang

Wang

et al. 2016

J of Applied Polymer Sci

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“…In addition, Py-GC/MS has been successfully applied to the qualitative and quantitative analysis of WPCs, e.g. wood type, the polymer matrix, and the ratio of thermoplastic polymers and wood in WPCs (Fabiyi et al 2008;Schwarzinger et al 2008;Windt et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Study on the Pyrolytic Behavior of Wood-Plastic Composites using Py-GC/MS

et al. 2013

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Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was employed to investigate the primary pyrolysis product distribution of the pyrolysis of wood-plastic composites (WPCs) and the mutual effects of poplar wood (PW) and high-density polyethylene (HDPE). The PW, HDPE, and WPCs were pyrolysed at 475, 550, and 625 °C. The effect of temperature on the WPC pyrolysis products was examined. The comparison of the degradation composition results for HDPE, PW, and WPCs indicated that thermal degradation of WPCs comprised individual poplar wood and HDPE pyrolytic decompositions, and the pyrolytic products of PW and HDPE did not react with each other. The experimental results demonstrate that the pyrolytic product distribution of HDPE changed apparently in the presence of PW during pyrolysis. The PW decomposed at lower temperature during pyrolysis provided radicals, enhancing the scission of polymer chains to obtain more light paraffins. Further, the proposed pathway for the evolution of the main volatile organic products was probed. This study provides insights into the fundamental mechanisms of WPC pyrolysis and a basis for developing more descriptive models of WPC pyrolysis.

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“…Analytical pyrolysis is an effective way to study the chemical structures of complex polymers, such as lignins, humic substances, wood plastic composites, etc. (Shadkami and Helleur 2010 ;Windt et al 2011 ). For better understanding of these conversions and analytical methods, lignin pyrolysis has been studied based on isolated lignins (Martin et al 1979 ;Obst 1983 ;Evans et al 1986 ;Saiz -Jimenez and De Leeuw 1986 ;Faix et al 1987 ;Genuit et al 1987 ;Meier and Faix 1992 ;Greenwood et al 2002 ;Hosoya et al 2007Hosoya et al , 2008aNakamura et al 2008 ) and model compounds (Domburg et al 1974 ;Bre ž n ý et al 1983 ;Saiz -Jimenez and De Leeuw 1986 ;Kawamoto et al 2006Kawamoto et al , 2008aNakamura et al 2007Nakamura et al , 2008Watanabe et al 2009 ).…”

Section: Introductionmentioning

confidence: 99%

The effects of combining guaiacol and syringol on their pyrolysis

Asmadi¹,

Kawamoto

Saka

2012

Holzforschung

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Pyrolysis of guaiacol/syringol mixtures was studied in an ampoule reactor (N 2 /600 ° C/40 -600 s) to understand the reactivities of the aromatic nuclei in hardwood lignins. By comparing the results with those of pure guaiacol or syringol, signifi cant effects of their combination were observed during early stage pyrolysis: charring and gas formation were markedly suppressed. Yields for the tar fractions (MeOHsoluble) were increased by combination but the contents of GC/MS-detectable products with low molecular weight were dramatically decreased in these fractions, especially catecholtype compounds diminished, which are formed through the O-CH 3 homolysis reaction and subsequent donation of hydrogen atoms. These observations are discussed at the molecular level. Inhibition of the charring reaction, which can act as a strong hydrogen donor, would increase the probability of radical coupling reactions of the O-CH 3 homolysis products instead of the formation of catechol and pyrogallol and their derivatives. The latter compounds are important intermediates for gas formation, especially for CO. Based on these lines of evidence, a hypothesis is proposed according to which polyaromatization during carbonization activates the pyrolytic reactions of guaiacol and syringol.

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Quantification of polypropylene (PP) in wood plastic composites (WPCs) by analytical pyrolysis (Py) and differential scanning calorimetry (DSC)

Cited by 23 publications

References 43 publications

Improving thermo‐oxidative degradation resistance of bamboo fiber reinforced polypropylene composite with antioxidants. Part I: Screening of antioxidants

Improving thermo‐oxidative degradation resistance of bamboo fiber reinforced polypropylene composite with antioxidants. Part I: Screening of antioxidants

Study on the Pyrolytic Behavior of Wood-Plastic Composites using Py-GC/MS

The effects of combining guaiacol and syringol on their pyrolysis

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