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Summary In this study, the thermal properties of agro-flour-filled polybutylene succinate (PBS) bio-composites were investigated. PBS is one of the biodegradable polymers made from the condensation reaction of glycols and dicarboxylic acid and is naturally degraded by natural soil burial system. The thermal properties of the bio-composites were analyzed according to the agro-flour content and mesh size. On increasing agro-flour content, the thermal stability, degradation temperature and derivative thermogravimetric curve (DTGmax) temperature of the bio-composites decreased while the ash content increased. The thermal degradation of the bio-composites was not affected by agro-flour mesh size. The glass transition (T g) and melting (T m) temperatures of the bio-composites were not significantly changed. The storage modulus (E’) of the bio-composites was higher than that of neat PBS, because the incorporation of agro-flour increased the stiffness of the bio-composites. At higher temperatures, E’ of the bio-composites decreased due to the increasing viscosity and chain mobility of neat PBS. The thermal properties of bio-composites have an important effect on the manufacturing system and application methods.

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Abstract  

In this study, the thermal properties of bio-flour-filled, polypropylene (PP) bio-composites with different pozzolan contents were investigated. With increasing pozzolan content, the thermal stability, 5% mass loss temperature and derivative thermogravimetric curve (DTGmax) temperatures of the bio-composites slightly increased. The coefficient of thermal expansion (CTE) and thermal expansion of the bio-composites decreased as the pozzolan content increased. The glass transition temperature (T g), melting temperature (T m) and percentage of crystallinity (X c) of the bio-composites were not significantly changed. The thermal stability, thermal expansion and X c of the maleic anhydride-grafted PP (MAPP)-treated bio-composites were much higher than those of non-treated bio-composites at 1% pozzolan content due to enhanced interfacial adhesion. X-ray diffraction (XRD) analysis confirmed the crystallinity of pozzolan-added bio-composites. From these results, we concluded that the addition of pozzolan in the bio-composites was an effective method for enhancing the thermal stability and thermal expansion.

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Abstract  

The purpose of this study was to conduct a thermal analysis of the hydrolysis and degradation behavior of biodegradable polymers and bio-composites at 50°C and 90% relative humidity (RH). With increasing hydrolysis time, the thermal stability and degradation temperature of polybutylene succinate (PBS) slightly decreased. The glass transition temperature (T g) and melting temperature (T m) of PBS and the anti-hydrolysis agent treated PBS did not vary significantly with increasing hydrolysis time, whereas those of the trimethylolpropane triacrylate (TMPTA)-treated PBS slightly increased. With increasing hydrolysis time, the storage modulus (E’) values of the bio-composites decreased, whereas those of the TMPTA treated bio-composites slightly increased. Also, the tan values of the anti-hydrolysis agent and TMPTA treated PBS-BF bio-composites were slightly lower than those of the non-treated bio-composites, due to the reduction in their degree of hydrolysis. The tanδmax peak temperature (T g) of the anti-hydrolysis agent treated bio-composites was not significantly changed, whereas that of the TMPTA treated bio-composites was increased.

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the potential of the cross linked Cs particle as the reinforcement agent of the Cs-based bio-composites, to optimize the thermal properties of the Cs film. To the best of our knowledge, the combination of both approaches (single composite polymer with

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advantages, such as low cost, renewability, biodegradability, low specific gravity, abundance, high specific strength, and non-abrasiveness [ 3 ]. Therefore, bio-composites reinforced with natural fibers appear to be an alternative material to glass fiber

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data are difficult to find and characterization results are virtually non-existent. Therefore, development of a novel method to produce wood pulp- polypropylene bio-composite fibers in an extrusion process seems to be a promising technique which

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Summary  

In the TG analysis of the bio-composites, their thermal stability was found to slightly decrease and the ash content to increase as the lignocellulosic filler loading increased. This is a logical consequence of the lower thermal stability of the lignocellulosic filler compared to that of the matrix polymer. The dispersion and interfacial adhesion between the lignocellulosic filler and thermoplastic polymer were important factors affecting the thermal stability of the composite system. In order to improve their compatibility and interfacial adhesion, the incorporation of a compatibilizing agent into the lignocellulosic material-thermoplastic polymer composites is recommended. In the TMA analysis, the thermal expansion of the composites was found to decrease with increasing filler loading and incorporating compatibilizing agent. Lignocellulosic filler is a suitable material for preventing the thermal expansion of the composite materials caused by atmospheric changes.

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Abstract  

In this study, we investigated the viscoelastic and thermal properties of lignocellulosic material filled polypropylene (PP) bio-composites. Lignocellulosic fillers are totally bio-degradable and PP is a thermoplastic polymer which has good stiffness, tenacity, flexural strength and thermal properties. The thermal and viscoelastic properties of the composites with different filler contents were examined using differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA), respectively. The effects of the compatibilizing agent were also evaluated. The glass transition (T g) and melting (T m) temperatures of the composites did not vary significantly with the filler content, because no chemical bonding occurred at the interface between the matrix and filler. However, the compatibility between the filler and PP matrix was increased by the incorporation of the compatibilizing agent. The storage modulus (E′) of the composites was higher than that of the neat PP, indicating that the incorporation of the natural filler increased their stiffness. The thermal properties of the composites should be considered as an important factor in the manufacturing process and the use of the final products.

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. 3. Kim , H-S , Kim , H-J , Lee , J-W , Choi , I-G . Biodegradability of bio-flour filled biodegradable poly(butylene succinate) bio-composites in natural and compost soil . Polym Degrad Stabil 2006 91 : 1117 – 1127

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– 50 10.1177/0892705707085347 . 7. Yang , HS , Gardner , DJ , Kim , HJ . Viscoelastic and thermal analysis of lignocellulosic material filled polypropylene bio-composites . J Therm

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