Thermogravimetric behavior of natural fibers reinforced polymer composites—An overview

The application of wood-plastic composites is growing rapidly in the fields of corrosion and aging. The present study investigated the effect of alkalitreated (with NaOH concentrations of 0.5, 2.5, 4.5, and 6.5%) sorghum straw (SS) fiber on the wear resistance of polyvinyl chloride (PVC) composites under simulated seawater and acid rain conditions. The results showed that the wear resistance of the SS/PVC composites was noticeably improved by the addition of the alkali-treated SS fiber. SS fiber treated with 4.5% NaOH showed low polarity and hydrophilicity with high crystallinity and improved mechanical properties, which endowed the SS/PVC composites with high interfacial bonding and wear resistance. Exposure to simulated seawater and acid rain resulted in the deterioration of physical (including water repellency and hardness), mechanical, thermal, and wear-resistance properties of the composites; the wear mechanism of the SS/PVC composites after corrosion for 12 days was mainly abrasive wear.

Section: Fig 8 Tg Curves Of the Ss/pvc Compositesmentioning

confidence: 99%

Wear Behavior of Alkali-Treated Sorghum Straw Fiber Reinforced Polyvinyl Chloride Composites in Corrosive Water Conditions

Jiang

et al. 2018

“…The second occurred between 270 and 290 C during the thermal depolymerization or decomposition of hemicelluloses. Cellulose decomposes in the range of 350 to 375 °C, which corresponds to the third weight loss stage (Monteiro et al 2012;Ozen et al 2013). The TGA curves of natural fiber blendfilled Nylon 6 composites were also divided into three regions.…”

Section: Glass Transition Tempmentioning

confidence: 99%

Thermal Analysis of Polyamide 6 Composites Filled by Natural Fiber Blend

Kiziltas¹,

Han²,

Kızıltaş³

et al. 2016

aThis study describes changes in the viscoelastic and thermal properties of composites made with various percentages (up to 20 wt.%) of a natural fiber blend (a mixture of flax, kenaf, and hemp fibers) and polyamide 6 (PA 6). According to the differential scanning calorimetry (DSC) analyses, the incorporation of natural fibers produced minor changes in the glass transition (Tg), melting (Tm), and crystallization temperature (Tc) of the PA 6 composites. Because of the reinforcing effect of natural fibers, the storage modulus (E') from dynamic mechanical thermal analysis (DMTA) increased as the natural fiber content increased. The E' values at room temperature and Tg were 3960 MPa and 1800 MPa, respectively, with the incorporation 20 wt.% fiber, which were 68% and 193% higher than the E' value of neat PA 6. As the natural fiber content increased, the thermal stability of the composites decreased, and thermogravimetric analysis (TGA) showed that the onset temperature of rapid thermal degradation decreased from around 440 (neat PA 6) to 420 °C (20 wt.% natural fiber blend). The addition of 20 wt.% single type fibers showed comparable DSC and TG results to the incorporation of 20 wt.% natural fiber blends.

“…In TGA, the mass of a substance is monitored as a function of temperature or time in a controlled atmosphere (Kim et al 2004(Kim et al , 2005Yao et al 2008;Monteiro et al 2012). In some situations there will be no mass change over time or changes in temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Bamboo Fibre and Its Composites

Shah¹,

Sultan²,

Cardona³

et al. 2017

Thermogravimetric analysis and differential scanning calorimetry were used to study the thermal degradation and thermal stability of bamboo powder and its composites (EP-BFC) in a nitrogen atmosphere. The thermal stability of EP-BFC decreased as the bamboo filler-loading increased. Compared with epoxy, bamboo powder had a lower thermal stability, which reduced the thermal stability for the higher filler-loading composites. The addition of glass fibre to the EP-BFC improved the thermal stability of the new hybrid composites. Both the hybrid and nonhybrid composites exhibited similar thermal-induced degradation profiles that had only one mass loss step. However, a noticeable difference between the percentage value of the degradation between both the hybrid and non-hybrid composites showed that the EP/G-BFC hybrids were more thermally stable than the non-hybrid EP-BFC. Different materials experienced different activities, which were clearly shown from the DSC analysis. Bamboo fibre and non-fully cured epoxy exhibit exothermic peaks, while fully cured epoxy exhibits an endothermic peak.