Optimization and fabrication of pure poly lactic acid (PLA) using hot press compression moulding

The aim of this study is to investigate the influence of carbon nanotubes (CNT) on the antistatic and thermal properties of poly(lactic acid)/polypropylene/carbon nanotubes (PLA/PP/CNT) nanocomposites. PLA/PP (blend ratio = 60:40) containing CNT (loading 1.0 to 2.5 phr) was melt-compounded followed by compression moulding. The antistatic properties of PLA/PP/CNT nanocomposites achieved at 2.5 phr CNT loading. Thermogravimetric analysis (TGA) results indicated that the thermal stability of PLA/PP/ CNT nanocomposite was higher than PLA/PP blend. Differential Scanning Calorimetry (DSC) results demonstrated that CNT reduced the cold crystallisation temperature of PLA, while increased the crystallisation temperature of PP, which evidenced the nucleatingability of CNT in the PLA/PP blends.

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Influence of plasticizers on thermal properties and crystallization behaviour of poly(lactic acid) films obtained by compression moulding

Polymer International ◽

10.1002/pi.5142 ◽

2016 ◽

Vol 65 (8) ◽

pp. 970-978 ◽

Cited By ~ 22

Author(s):

Justine Muller ◽

Alberto Jiménez ◽

Chelo González-Martínez ◽

Amparo Chiralt

Keyword(s):

Lactic Acid ◽

Thermal Properties ◽

Crystallization Behaviour ◽

Poly Lactic Acid ◽

Compression Moulding

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Poly (Lactic Acid)/Wood Fibers Biodegradable Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.2283 ◽

2010 ◽

Vol 44-47 ◽

pp. 2283-2287

Author(s):

Ming Hui Guo ◽

Yuan Yuan

Keyword(s):

Lactic Acid ◽

Water Resistance ◽

Wood Fiber ◽

Poly Lactic Acid ◽

Flexural Properties ◽

Wood Fibers ◽

Hot Press ◽

Press Temperature ◽

Biodegradable Composites ◽

Properties Of Composites

In our research, a commercial poly (lactic acid) (PLA) film was used in combination with wood fiber matrix to generate biodegradable composites by a film stacking technique and hot-press. The results showed the flexural properties and water resistance increased with the increasing of PLA addition. Silane-treated wood fiber composites significantly improved the flexural properties compared to untreated composites. In experiment range, the physical and mechanical properties of composites were better in higher hot-press temperature. The optimal parameters are determined by PLA addition 20%, silane addition 3%, the hot-press temperature 190°C, the hot-press time 10min.Under these parameters, the flexural properties of composites exceeded the requirement of the outdoor boards’ standard, but the water resistance was a little low.

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Mechanical properties under quasi-static loading of the core made of flax/poly(lactic acid) composite

Polimery ◽

10.14314/polimery.2021.3.5 ◽

2021 ◽

Vol 66 (3) ◽

pp. 193-197

Author(s):

M.Y.M. Zuhri ◽

M.A. Nasrudin ◽

M.A.M. Nasrodin ◽

S.M. Sapuan ◽

M.Z. Hassan

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Specific Energy ◽

Static Loading ◽

Poly Lactic Acid ◽

Core Size ◽

Hot Press ◽

Specific Energy Absorption ◽

The Core ◽

Number Of Layers

This paper investigates the mechanical behavior of an interlocking structure made of flax/poly(lactic acid) (PLA) composites manufactured using hot press compression molding. The flax/PLA composite manufactured at a temperature of 190°C and pressed for 10 minutes obtained the highest values of strength and modulus. A range of core cell sizes between 10 and 40 mm with a height from 20 to 40 mm was fabricated using a simple slotting technique. The larger core size offers a better relative density value when comparing to the smaller size (with a similar number of layers). The results also showed that the 10 mm core size exhibits better compression strength than the 20 and 40 mm core sizes. In contrast, the specific energy absorption (SEA) values of the structures increase as the core size decreases.

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Thermomechanical Study and Thermal Behavior of Plasticized Poly(Lactic Acid) Nanocomposites

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.317.333 ◽

2021 ◽

Vol 317 ◽

pp. 333-340

Author(s):

Mohammed Zorah ◽

Izan Roshawaty Mustapa ◽

Norlinda Daud ◽

Nahida Jumah ◽

Nur Ain Syafiqah Sudin ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Lactic Acid ◽

Thermal Behavior ◽

Food Packaging ◽

Mechanical Performance ◽

Poly Lactic Acid ◽

Solvent Casting ◽

Thermal And Mechanical Properties ◽

Hot Press

Poly (lactic acid) (PLA) is a useful alternative to petrochemical commodity material used in such as in food packaging industries. Due to its inherent brittleness, low thermal stability, and poor crystallization, it needs to improve its properties, namely in terms of thermal and mechanical performance. The plasticized PLA composites reinforced with nanofiller were prepared by solvent casting and hot press methods. Thermal and mechanical properties, as well as the crystallinity study of these nanocomposites, were investigated to study the effect of tributyl citrate (TBC) and TiO2 on the PLA composites. The addition of TBC improved the flexibility and crystallinity of the composites. Reinforcement of TiO2 was found as a practical approach to improve the mechanical properties, thermal stability, and enhanced crystalline ability for plasticized PLA nanocomposites. Based on the results achieved in this study, the composite with 3.5% nanofiller (pPLATi3.5) presented the optimum set of mechanical properties and improved thermal stability.

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Mechanical, Physical and Thermal Properties of Sugar Palm Nanocellulose Reinforced Thermoplastic Starch (TPS)/Poly (Lactic Acid) (PLA) Blend Bionanocomposites

Polymers ◽

10.3390/polym12102216 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2216

Author(s):

A. Nazrin ◽

S. M. Sapuan ◽

M. Y. M. Zuhri

Keyword(s):

Lactic Acid ◽

Barrier Properties ◽

Thermoplastic Starch ◽

Poly Lactic Acid ◽

Thickness Swelling ◽

Compression Moulding ◽

Sem Images ◽

Increasing Trend ◽

Loading Effects ◽

Thermal Stability Of

In this paper, sugar palm nanocellulose fibre-reinforced thermoplastic starch (TPS)/poly (lactic acid) (PLA) blend bionanocomposites were prepared using melt blending and compression moulding with different TPS concentrations (20%, 30%, 40%, 60%, and 80%) and constant sugar palm nanocellulose fibres (0.5%). The physical, mechanical, thermal, and water barrier properties were investigated. The SEM images indicated different TPS loading effects with the morphology of the blend bionanocomposites due to their immiscibility. A high content of TPS led to agglomeration, while a lower content resulted in the presence of cracks and voids. The 20% TPS loading reduced the tensile strength from 49.08 to 19.45 MPa and flexural strength from 79.60 to 35.38 MPa. The thermal stability of the blend bionanocomposites was reduced as the TPS loading increased. The thickness swelling, which corresponded to the water absorption, demonstrated an increasing trend with the increased addition of TPS loading.

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Effects of micrometre-sized graphite flake to reinforce the performances of poly(lactic acid) thermoplastic biocomposites

Polymers and Polymer Composites ◽

10.1177/0967391118811218 ◽

2018 ◽

Vol 27 (1) ◽

pp. 20-32

Author(s):

Shamsun Alam ◽

Md Forhad Mina ◽

Mohammad Jellur Rahman ◽

Md Abdul Gafur ◽

Kazi Hanium Maria ◽

...

Keyword(s):

Electron Microscopy ◽

Lactic Acid ◽

Filler Content ◽

Poly Lactic Acid ◽

Graphite Flake ◽

X Ray Diffraction ◽

Compression Moulding ◽

Transmission Electron ◽

Tangent Moduli ◽

Band Spectra

Biocomposites of poly(lactic acid) (PLA) and micrometre-sized graphite (GP) flake powder with 0–30 wt% GP contents have been prepared using extrusion moulding followed by compression moulding. The pure PLA and PLA-GP composites (PGC) have been examined by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy (RS), X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), transmission electron microscopy (TEM), mechanical and micromechanical testing, differential thermal analysis (DTA) and thermogravimetric analysis (TGA). FTIR spectra confirm the physical bond formation between GP and PLA. RS distinguishes the D-band spectra of pure PLA and PGC. XRD shows a partially crystalline structure in the PLA. SEM and TEM exhibit a clear dispersion of GP particles in PLA matrix at lower loading and aggregates at higher loading. With an increase of filler content, the tensile and flexural strengths decrease, but the Young’s and tangent moduli are observed to increase by 58% and 77%, respectively. These increments represent an increase in the stiffness of the materials and are found to be consistent with the theoretical values. A decrease in microhardness with increase in filler content is also observed. Both the DTA and TGA reveal an increased thermal stability of the composites.

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Rheological and Mechanical Properties of Poly(lactic) Acid/Cellulose and LDPE/Cellulose Composites

Materials Science ◽

10.5755/j01.ms.17.1.245 ◽

1970 ◽

Vol 17 (1) ◽

pp. 32-37 ◽

Cited By ~ 12

Author(s):

Dmitri SHUMIGIN ◽

Elvira TARASOVA ◽

Andres KRUMME ◽

Pille MEIER

Keyword(s):

Lactic Acid ◽

Rheological Behaviour ◽

Tensile Tests ◽

Low Density Polyethylene ◽

Poly Lactic Acid ◽

Cellulose Content ◽

Low Density ◽

Compression Moulding ◽

Cellulose Fibres ◽

Cellulose Composites

In our work we studied composites of poly(lactic) acid (PLA) and low density polyethylene filled with cellulose fibres. The studied composite materials were manufactured with a twin-screw extruder. The extruded compound was processed in to samples using compression moulding. The content of cellulose in polymer/cellulose composites was varied. Effect of low amounts of cellulose on the rheological and tensile properties was studied. Tensile tests showed that the incorporation of cellulose into PLA matrix lead to stiffer but slightly more brittle and weaker materials, since Young's modulus increases and tensile strength and elongation at break slightly decrease. Mechanical results are in agreement with rheological behaviour: the composites exhibit the improvement in the storage and loss moduli of composites compared with that of matrix polymers. The composite dynamic viscosity increases with cellulose content in the same manner as loss and storage moduli. The processing and material properties of PLA/cellulose composites were compared to the more commonly used low-density-polyethylene/cellulose composites.http://dx.doi.org/10.5755/j01.ms.17.1.245

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Molecular Modification of Hydroxyapatite to Introduce Interfacial Bonding with Poly (Lactic Acid) in Biodegradable Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.288-289.227 ◽

2005 ◽

Vol 288-289 ◽

pp. 227-230 ◽

Cited By ~ 1

Author(s):

Sheng Min Zhang ◽

Qing Ming Luo ◽

Rui Rui Cao ◽

Shi Pu Li

Keyword(s):

Lactic Acid ◽

Calcium Release ◽

Poly Lactic Acid ◽

Hot Press ◽

Swelling Property ◽

Molecular Modification ◽

Biodegradable Composites ◽

Relationship Of ◽

Calcium Precipitation ◽

Press Molding

Six silane-modified hydroxyapatite (HA) / poly(lactic acid) (PLA) composites at 20% volume HA are prepared through absorption in liquid phase, volatilization, milling, and hot-press molding. Bending testing results indicate that their bending strengths are higher than that of control HA composite (unmodified HA composite) and the maximum strength enhances 27.8%. Calcium precipitation and calcium release experiments are designed to examine the bioactivity of the modified HA. The results show that the presence of the modification coating does not really impair the bioactivity and mineralization tendency of HA particles. Relationship of swelling property of the composites as function of time is investigated. Swelling equilibriums of silane-modified HA / PLA composites are reached after 48 h or 72 h, but the equilibrium of the unmodified HA / PLA composite is reached within 24 h. The swelling experiment also suggests that the desired swelling property of the composites could be achieved by changing modification molecules of HA according to necessity. Finally, SEM micrographs show that there is an improved interfacial binding between the modified HA and PLA matrix.

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Production of optically pure poly(lactic acid) from lactic acid

Polymer Bulletin ◽

10.1007/s00289-009-0115-2 ◽

2009 ◽

Vol 63 (5) ◽

pp. 637-651 ◽

Cited By ~ 14

Author(s):

Dong-Keun Yoo ◽

Dukjoon Kim

Keyword(s):

Lactic Acid ◽

Poly Lactic Acid ◽

Optically Pure ◽

Pure Poly

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