Ductile–brittle transition temperature of polylactic acid-based biocomposite

Kaiser, Mohammad Rejaul; Anuar, Hazleen; Razak, Sba

doi:10.1177/0892705711420595

Cited by 26 publications

(14 citation statements)

References 10 publications

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“…Moreover, XPS survey spectra ( Figure 5 ) and FTIR showed the presence of Na as sodium carboxylate on the surface of MCC-T which may catalyze the depolymerization reaction of PHB. Indeed, previous study has shown that many metal compounds but especially Na and Mg accelerate the random chain scission and the degradation of PHB [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

“…The more accentuated decrease of the E’ , observed between about −10 °C and 25–30 °C, was determined by the transition of PHB from glassy to rubbery state and the activation of molecular segmental motions at the glass transition temperature [ 44 ]. Variation of loss factor (tan δ) with temperature ( Figure 10 b) emphasizes the relative contributions of the elastic and viscous components when temperature increases.…”

Section: Resultsmentioning

confidence: 99%

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Poly(3-hydroxybutyrate) Modified by Plasma and TEMPO-Oxidized Celluloses

et al. 2020

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Microcrystalline cellulose (MCC) was surface modified by two approaches, namely a plasma treatment in liquid using a Y-shaped tube for oxygen flow (MCC-P) and a TEMPO mediated oxidation (MCC-T). Both treatments led to the surface functionalization of cellulose as illustrated by FTIR and XPS results. However, TEMPO oxidation had a much stronger oxidizing effect, leading to a decrease of the thermal stability of MCC by 80 °C. Plasma and TEMPO modified celluloses were incorporated in a poly(3-hydroxybutyrate) (PHB) matrix and they influenced the morphology, thermal, and mechanical properties of the composites (PHB-MCC-P and PHB-MCC-T) differently. However, both treatments were efficient in improving the fiber–polymer interface and the mechanical properties, with an increase of the storage modulus of composites by 184% for PHB-MCC-P and 167% for PHB-MCC-T at room temperature. The highest increase of the mechanical properties was observed in the composite containing plasma modified cellulose although TEMPO oxidation induced a much stronger surface modification of cellulose. This was due to the adverse effect of more advanced degradation in this last case. The results showed that Y-shaped plasma jet oxidation of cellulose water suspensions is a simple and cheap treatment and a promising method of cellulose functionalization for PHB and other biopolymer reinforcements.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Poly(3-hydroxybutyrate) Modified by Plasma and TEMPO-Oxidized Celluloses

et al. 2020

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“…During the impact test, the energy absorbed from the fracture of the specimen was calculated by using Equation (1). Likewise, the Charpy impact strength can be calculated by dividing the absorbed energy by the cross-sectional area to determine the DBTT [15]. Experimental temperatures set for specimens were in the range between the RT (room temperature) and CT (−160 °C).…”

Section: Resultsmentioning

confidence: 99%

“…With the decreased temperature, the chain in the polymer is rigidly bounded. In these circumstances, the absorbed impact energy was demonstrated to decrease [15].…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, there have been very few studies on the DBTT of composite materials. Kaiser et al [15] conducted an experimental study to determine the ductile-to-brittle transition of various PLA-based bio-composites—PLA, PLA-20KF (Kenaf fiber), PLA-20KF-5Clay, and PLA-5Clay—through impact tests at temperatures ranging from −5 °C to 28 °C. Flexman [16] examined the ductile-brittle transitions of nylon-66 compositions by Izod and falling weight tests.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Cryogenic Impact Properties for a Glass-Fiber-Reinforced Dicyclopentadiene with a Different Amount of Decelerator Solution

et al. 2019

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Composites using dicyclopentadiene (DCPD) as a matrix have gained significant popularity owing to their excellent impact and chemical corrosion resistance. In the present study, experiments addressing the impact behavior of glass-fiber-reinforced DCPD were conducted to quantitatively evaluate its impact properties. The glass-fiber-reinforced polydicyclopentadiene composite utilized in impact tests was manufactured using structural reaction injection molding (S-RIM) because of its fast curing characteristics and low viscosity. The impact properties of the glass-fiber-reinforced DCPD (GF/DCPD) were quantitatively evaluated by varying its fiber content and decelerator solution. The impact properties of neat DCPD and GF/DCPD composites were examined with different amounts of decelerator solution under various temperatures from room temperature to cryogenic temperature to observe the ductile-to-brittle transition temperature (DBTT). With an increase in the fiber weight fraction of the GF/DCPD composite, the effect of the DBTT significantly decreased. However, the decreasing rate retarded as the weight fraction of the GF increased. The decreased DBTT with the addition of GF in the GF/DCPD can be attributed to the differences in the thermal expansion ratio and the interfacial force between neat DCPD and the fiber. A fractograph analysis demonstrates that the effect of the brittle (smooth) surface resulted in a lower impact absorbed energy when the temperature decreased, along with the increased amount of the decelerator.

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