Physical and Mechanical Properties of Recycled Polypropylene Composites Reinforced with Rice Straw Lignin

Karina, Myrtha; Syampurwadi, Anung; Satoto, Rahmat; Irmawati, Yuyun; Puspitasari, Tita

doi:10.15376/biores.12.3.5801-5811

Cited by 13 publications

(9 citation statements)

References 22 publications

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“…At time, both the forces between various molecules and the hydrogen bonds formed between the interfaces increase, which enhances the mechanical properties of PLA. However, due to the interaction of hydrophobic and π‐π bonds between microsphere molecules, [ 30 ] microspheres would agglomerate with the increase of NPA‐60 content. NPA‐60 could not uniformly disperse in the pure PLA matrix, resulting in the decline of the mechanical properties of composites.…”

Section: Resultsmentioning

confidence: 99%

Novel lignin microspheres reinforced poly (lactic acid) composites for fused deposition modeling

Long

Yang

et al. 2022

Polymer Composites

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Lignin microspheres were prepared by the solvent‐anti‐solvent method and blended with pure poly (lactic acid) (PLA) to prepare lignin microspheres/PLA composites for fused deposition modeling. Lignin microspheres were successfully prepared by using deionized water as the anti‐solvent and methanol (MAL), ethanol (EAL), and n‐propanol (NPA) as solvent, respectively. Scanning electron microscopy (SEM) of lignin microspheres showed that the best microspheres were prepared by NPA at 60 C (NPA‐60), with the size range of microspheres between 800 and 1000 nm. Moreover, the lignin microspheres/PLA composites showed the best mechanical properties when 0.375 wt% NPA‐60 was doped into PLA matrix. Compared with pure PLA, the tensile strength, flexural strength and impact strength of the 0.375 wt% NPA‐60/PLA composites were increased by 49.80%, 25.00%, and 112.64%, respectively. Therefore, the lignin microsphere/PLA composites prepared by using a small amount of lignin microspheres as reinforcing filler has excellent mechanical properties, which are ideal 3D printing materials for fused deposition modeling.

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Section: Resultsmentioning

confidence: 99%

Novel lignin microspheres reinforced poly (lactic acid) composites for fused deposition modeling

Long

Yang

et al. 2022

Polymer Composites

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“…However, it has also been reported that the lignin content has a negative effect on the tensile strength of PP matrix composites, while increasing the modulus. 39 For instance, Bledzki et al 40 stated that jute fibers are strong but brittle and have a low elongation at break because of its high lignin content (up to 20%). Furthermore, as previously mentioned, differences in the structural properties of the natural fibers can also affect their mechanical properties together with the lignocellulosic nature of the fibers.…”

Section: Resultsmentioning

confidence: 99%

A novel natural fiber from plane tree (Platanus orientalis L.) fruits to reinforce polypropylene composites

Savaş

2022

Journal of Composite Materials

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This study investigated the mechanical properties of polypropylene composites reinforced with short natural fibers obtained from plane tree ( Platanus orientalis L.) fruits. The fibers were harvested from the fruits that naturally fell from the tree in their standard length of about 6 mm. Composites were produced via melt blending using varied concentrations of the fibers (5–10–20–30 wt.%) and maleic anhydride grafted polypropylene (MAPP) copolymer as the coupling agent. The mechanical properties of the composites were characterized by tensile test, flexural test, dynamic mechanic analysis and ball-on-disc sliding wear test. The findings revealed that the fibers had a significant effect on the mechanical properties of the polypropylene matrix and the properties were found to improve linearly with increasing fiber concentration. At a 30 wt.% fiber concentration, the tensile and flexural strengths increased about 28% and 36% compared to pure polypropylene, respectively. At this fiber concentration, the modulus doubled compared to the pristine polymer. This increase is higher than that reported for most other natural fibers. Good miscibility between fibers and matrix, enhanced thermal stability, and about 30% reduction in friction coefficients were found. As a result, PTFs have the potential to be used in industries such as automotive, construction and sports which require mechanical strength and low weight.

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“…The materials were then weighed to the nearest 0.001 G and mixed based on their weight pecentages (Table 4) in a rotary mixer, Santam Co., Iran for 5 min. 25 The obtained mixture was poured in a die of 28 × 28 × 1.3 cm and pressed under a hydraulic hot press, Santam Co., Iran at 185°C (35 bar, 18 min). The manufactured samples were then cold pressed at the same pressure for 10 min to release the incurred stresses.…”

Section: Methodsmentioning

confidence: 99%

Effects of organically-modified montmorillonite and alkalinization on physical, mechanical, chemical, morphological, and thermal properties of wheat straw/recycled polypropylene nanocomposites

Naghdi

Nejat

2023

Journal of Composite Materials

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Valorization of wheat straw fiber/recycled polypropylene nanocomposites was investigated through studying the individual and combined effects of organically modified montmorillonite (OMMT) and alkali treatments on the given composites. FTIR spectra indicated the reduction of wheat straw fibers' hydroxyl groups due to hemicellulose removal resulting from alkali treatment. There were also trace diminutions in C-O peak intensities due to the degradation of little amounts of lignin. X-ray analysis revealed the intercalation of nanoclay in the polymer matrix. The improved interaction of fiber-polymer interfaces brought about by alkali treatment was also confirmed by scanning electron microscopy. The water absorption and thickness swelling properties of the nanocomposites were improved due to the barrier properties of nanoclay against water ingress. The flexural strength and modulus of elasticity increased by the individual, and likewise combined treatments. Thermogravimetric analysis demonstrated that the temperatures of first and second stages of composites' thermal degradation increased via the formation of a carbonized char layer thermally insulating the deeper composite layers. Differential scanning calorimetry showed some slight increases in the melting temperature, melting enthalpy, crystallisation temperature, crystallisation enthalpy, and crystallinity index of the treated composites due to the nucleating effect of nanofillers. The overall results showed that the combined treatment of OMMT and NaOH (vs. the individual ones) could significantly improve the overall properties of the studied composites. This was due to some interesting synergistic effects of the given treatments converting the wheat straw fiber/recycled polypropylene nanocomposites to high performance materials of choice for industry.

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Physical and Mechanical Properties of Recycled Polypropylene Composites Reinforced with Rice Straw Lignin

Cited by 13 publications

References 22 publications

Novel lignin microspheres reinforced poly (lactic acid) composites for fused deposition modeling

Novel lignin microspheres reinforced poly (lactic acid) composites for fused deposition modeling

A novel natural fiber from plane tree (Platanus orientalis L.) fruits to reinforce polypropylene composites

Effects of organically-modified montmorillonite and alkalinization on physical, mechanical, chemical, morphological, and thermal properties of wheat straw/recycled polypropylene nanocomposites

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