Physical and mechanical properties of PLA composites reinforced by TiO 2 grafted flax fibers

The present study focuses on the melamine-formaldehyde (MF) coating ratio and silanization of PLA/sisal composites. Poly(lactic acid) (PLA) was melt blended with short sisal fiber with and without MF resin coating. MF was applied at different weight ratios (sisal:MF 5 1:1; 1:3, and 1:5) to coat the untreated or silanized sisal fibers which were incorporated up to 20 parts per hundred resin (phr) amount in PLA. PLA/sisal composites were produced by compression molding. It was found that the sisal:MF coating ratio at 1:1 by weight improved the tensile strength and tensile modulus of the composite with 10 phr sisal by 4% and 57%, respectively, compared to the virgin PLA. The initial and final decomposition (T i ) and (T f ) of PLA with untreated sisal were changed from 330.8 and 367.1 to 336.2 and 370.4 8C, respectively, after MF-coating (sisal:MF weight ratio 5 1:1). This enhancement in thermal stability was attributed to the strong interaction between the MF and sisal fiber. The water absorption of PLA/MF-sisal composites slightly decreased with increasing sisal:MF ratio. This is due to the fact that the MF-coating substantially reduced the hydrophilic properties of sisal. Moreover, FTIR spectra and SEM images proved that sisal fibers were coated by MF resin successfully. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45681.

show abstract

“…The degree of crystallinity was calculated by eq. whereby accepting that the melting enthalpy of 100% crystalline PLA is

Δ H_{m}^{0}

93.7 J/g

χ (%) = \frac{Δ H_{m} - Δ H_{c c}}{(1 - {wt %}_{fiber}) \times Δ H_{m}^{0}}

where Δ H m and Δ H cc are enthalpy of melting and cold crystallization enthalpy, respectively, and

{wt %}_{fiber}

is weight fraction of fiber.…”

Section: Methodsmentioning

confidence: 99%

Mechanical, thermal, and water absorption properties of melamine–formaldehyde‐treated sisal fiber containing poly(lactic acid) composites

Tengsuthiwat

Asawapirom

Siengchin

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…This result was attributed to interaction between the organic functional groups on the GE surface and epoxy matrix in the DGEBA/GE nanocomposites . The increased impact strength was also due to the external energy absorbed by the cracks created by GE …”

Section: Resultsmentioning

confidence: 97%

Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

Jin

Guo

et al. 2019

Bulletin Korean Chem Soc

View full text Add to dashboard Cite

The surface of graphene (GE) was modified with a silane coupling agent, and its surface characteristics were investigated. Epoxy resin/GE nanocomposites were prepared via solution blending. The effect of the GE content on the thermal stability, flexural properties, impact strength, and morphology of the nanocomposites was studied. The thermal stability of the epoxy resin increased with the addition of pristine GE and surface‐modified GE. The flexural strength, elastic modulus, and impact strength of the nanocomposites with surface‐modified GE increased significantly with increasing GE content. Scanning electron microscopy images of the nanocomposites with surface‐modified GE show a ductile deformation morphology, which is consistent with their high impact strength.

show abstract

“…The heating and cooling rates were set at 10°C.min −1 . Equation was used to calculate the crystallinity ( X c ) of PLA polymers: .

X c (%) = 100 % true[Δ H_{normalm} / Δ H_{0} true(1 - x true) true]

…”

Section: Methodsmentioning

confidence: 99%

Design of doum palm fibers biocomposites by Reactor/elongational flow MiXer: Evaluation of morphological, mechanical, and microstructural performances

Ragoubi

Zouari²,

Abdeljawad

et al. 2017

Polymer Composites

View full text Add to dashboard Cite

An innovative mixing device RMX (Reactor/elongational flow MiXer), based on an elongational flow, is used to formulate new biocomposites based on Doum palm fiber (at various proportions) and PLA polymer. Due to its high elongational flow, RMX has the ability to mix immiscible products and to disperse the solid phase (fiber) in the viscous phase. The morphological aspect of PLA/Palm composites shows a good appearance and high fiber orientation and dispersive efficiency as confirmed by X‐ray tomography. For higher fiber content, the porosity rate decreases from 19% for untreated biocomposites to 11% for the treated ones. An enhancement of crystallinity degree is also recorded, mainly for alkali treated PLA biocomposites. This is explained by the nucleating effect of palm fiber which could favor the germination and the growth of spherolites around reinforcements. Moreover, the tensile performances show a progressive increase in Young moduli and a decrease in tensile strength upon increasing the fibers fraction and applying alkaline treatment. We highlight an enhancement in Young moduli at about 50% and 9% for treated ones compared to PLA matrix and untreated systems respectively. These improvements are attributed to the enhancement and improvement of interfacial adhesion as confirmed by scanning electron microscopy (SEM), carried out on fractured surfaces. In addition, viscoelastic behavior was evaluated by DMA analysis and further discussed. POLYM. COMPOS., 39:E519–E530, 2018. © 2017 Society of Plastics Engineers

show abstract

Physical and mechanical properties of PLA composites reinforced by TiO 2 grafted flax fibers

Cited by 120 publications

References 51 publications

Mechanical, thermal, and water absorption properties of melamine–formaldehyde‐treated sisal fiber containing poly(lactic acid) composites

Mechanical, thermal, and water absorption properties of melamine–formaldehyde‐treated sisal fiber containing poly(lactic acid) composites

Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

Design of doum palm fibers biocomposites by Reactor/elongational flow MiXer: Evaluation of morphological, mechanical, and microstructural performances

Contact Info

Product

Resources

About