Morphology development and mechanical properties of PLA/differently plasticized starch (TPS) binary blends in comparison with PLA/dynamically crosslinked “TPS+EVA” ternary blends

Ghari, Hedayatollah Sadeghi; Nazockdast, Hossein

doi:10.1016/j.polymer.2022.124729

Cited by 16 publications

(14 citation statements)

References 55 publications

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“…Similarly, a significant decrease in Young's modulus and tensile strength of PLA has been reported after blending the matrix with thermoplastic starch. 79,80 Likewise, Zhang et al 81 prepared PLA/starch composites (55/45) compatibilized by maleic anhydride and observed a 15 and 10% reduction in tensile strength and tensile strain, even in the biocomposite containing 2% maleic anhydride as a compatibilizer. Moreover, Zhou et al 63 observed a 13% decrease in the tensile strength of PVA/corn starch (80/20) biocomposite.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

Baniasadi,

Madani,

Mohan

et al. 2023

ACS Appl. Mater. Interfaces

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This study introduces the development of a thermally responsive shape-morphing fabric using low-melting-point polyamide shape memory actuators. To facilitate the blending of biomaterials, we report the synthesis and characterization of a biopolyamide with a relatively low melting point. Additionally, we present a straightforward and solvent-free method for the compatibilization of starch particles with the synthesized biopolyamide, aiming to enhance the sustainability of polyamide and customize the actuation temperature. Subsequently, homogeneous dispersion of up to 70 wt % compatibilized starch particles into the matrix is achieved. The resulting composites exhibit excellent mechanical properties comparable to those reported for soft and tough materials, making them well suited for textile integration. Furthermore, cyclic thermomechanical tests were conducted to evaluate the shape memory and shape recovery of both plain polyamide and composites. The results confirmed their remarkable shape recovery properties. To demonstrate the potential application of biocomposites in textiles, a heat-responsive fabric was created using thermoresponsive shape memory polymer actuators composed of a biocomposite containing 50 wt % compatibilized starch. This fabric demonstrates the ability to repeatedly undergo significant heat-induced deformations by opening and closing pores, thereby exposing hidden functionalities through heat stimulation. This innovative approach provides a convenient pathway for designing heat-responsive textiles, adding value to state-of-the-art smart textiles.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

Baniasadi,

Madani,

Mohan

et al. 2023

ACS Appl. Mater. Interfaces

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“…Starch is a natural, renewable, low‐cost, full‐degradable material that can be used to produce biodegradable plastics with wide applications, such as shopping bags, mulch, and film. [ 1 ] In fact, starch molecular chains usually crystallize as spherical granules due to the formation of abundant hydrogen bonds. [ 2 ] Thermal processability of starch is limited because the melting temperature of starch is close to its degradation temperature.…”

Section: Introductionmentioning

confidence: 99%

Constructing stable “bridge” structures with compatibilizer POE‐g‐GMA to improve the compatibility of starch‐based composites

Kong

Qian

Zhang

et al. 2023

Polymer Engineering & Sci

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With the development of degradation technologies such as chemical‐catalysis and bio‐catalysis, starch‐polyethylene (PE) composites have been revitalized as industrial packaging materials. However, starch and PE suffer from interfacial incompatibility. In this study, poly(octene ethylene) grafted glycidyl methacrylate (POE‐g‐GMA) was added at relatively low amounts (0–7 wt%) to construct robust structures between thermoplastic starch (TPS) and low‐density polyethylene (LDPE). Tensile strength increased by 36.39% with the addition of 1 wt% POE‐g‐GMA. Meanwhile, a smooth surface was observed by SEM, and a fibrillar cross‐linked structure appeared on the fractural surface of the blend. POE‐g‐GMA formed a stable “bridge” at the interface between TPS and LDPE, which increased the thermal stability of the blend as well. The crystallinity of LDPE increased from 20.5% (without addition) to 32.8% (with 1 wt% addition), whereas the average crystallite size decreased slightly. The optimal POE‐g‐GMA content was found to be 1 wt% based on mechanical and thermal measurements. The results of this study can provide a reference for improving the interfacial compatibility of biopolymers and fossil‐fuel‐based polymers.

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“…However, the phase separation of PLA/TPS blends often occurred due to the different polarities between the PLA and TPS, resulting in poor mechanical and gas barrier properties (Wootthikanokkhan et al, 2012;Yang et al, 2015). More recently, several studies have been published on the miscibility enhancement of polymer blends based on chemical modification (Akrami et al, 2016;Ghari and Nazockdast, 2022) and the incorporation of inorganic fillers (Djoumaliisky and Zipper, 2004;Thipmanee and Sane, 2012;Yimnak et al, 2020;Chongcharoenyanon and Sane, 2021).…”

Section: Introductionmentioning

confidence: 99%

Property enhancement of polylactic acid/thermoplastic starch blend using zeolite 5A incorporation and biaxial stretching process

2023

ANRES

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Importance of the work: Blended polylactic acid/thermoplastic starch (PLA/TPS) is a potential material for packaging; however, it still has poor mechanical and barrier properties. Objectives: To improve the mixing and performance of PLA/TPS blends by incorporation of zeolite 5A (Z5A) and biaxial orientation of the PLA/TPS/Z5A composite. Materials & Methods: PLA/TPS/Z5A pellets were prepared by melt-compounding using a twin-screw extruder. The composite pellets were converted into a sheet using cast sheet extrusion followed by biaxial stretching into films. The stretching rate was varied (75−150 mm/s). The microstructural, mechanical and gas barrier properties of the stretched films were investigated. Results: Z5A incorporation and the stretching rate affected the morphology and properties of the stretched films. The presence of Z5A enhanced mixing of PLA and TPS by reducing the TPS dispersed phase size and improving dispersion of TPS in the blend matrix. The biaxial stretching process increased the ordered structure and crystallinity of the PLA in the PLA/TPS/Z5A films. These improvements led to significant increases in tensile strength and the oxygen and water vapor barriers of the PLA/TPS blend up to 100, 90 and 65%, respectively. Increasing the stretching rate from 75 mm/s to 150 mm/s improved the tensile and impact strength by 26% and 22%, respectively. Main finding: This was the first report of simultaneous biaxial stretching of PLA/TPS/ Z5A composite film. The mixing and performance (mechanical and barrier properties) of the blend were substantially improved by compounding with Z5A and biaxial stretching process.

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Morphology development and mechanical properties of PLA/differently plasticized starch (TPS) binary blends in comparison with PLA/dynamically crosslinked “TPS+EVA” ternary blends

Cited by 16 publications

References 55 publications

Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

Constructing stable “bridge” structures with compatibilizer POE‐g‐GMA to improve the compatibility of starch‐based composites

Property enhancement of polylactic acid/thermoplastic starch blend using zeolite 5A incorporation and biaxial stretching process

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