Effect of chain extender on morphologies and properties of PBAT/PLA composites

Biodegradable poly(butylene adipate-co-terephthalate)/poly(lactic acid) (PBAT/PLA) composites were prepared by melt blending, and chain extender was used to improve the compatibility of PBAT/PLA blends through the chemical reaction. The influence of PLA and chain extender contents on mechanical properties, morphology, and rheological properties of PBAT/PLA composites was systematically investigated. The results revealed that the Young’s modulus and stress values gradually increased under the same strain, whereas the elongation at break decreased with the increase of chain extender content for PBAT/PLA (80/20) composites. Noteworthy, the presence of chain extender improves the interfacial compatibility between PLA and PBAT phases. At the chain extender content of 0.4, 0.6, and 0.8 wt.%, the extensional viscosity of the composites exhibited an increasing trend, whereas an obvious strain-hardening phenomenon emerged in the uniaxial extensional curves.

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Effect of a chain extender on the rheological and mechanical properties of biodegradable poly(lactic acid)/poly[(butylene succinate)-co-adipate] blends

Journal of Applied Polymer Science ◽

10.1002/app.38449 ◽

2013 ◽

Vol 129 (5) ◽

pp. 2418-2428 ◽

Cited By ~ 46

Author(s):

Hassan Eslami ◽

Musa R. Kamal

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Chain Extender ◽

Poly Lactic Acid ◽

Butylene Succinate ◽

Biodegradable Poly ◽

A Chain

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Study on the Mechenical Properties of PPC/PLA Blends Modified by POSS

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.741.28 ◽

2013 ◽

Vol 741 ◽

pp. 28-32 ◽

Cited By ~ 2

Author(s):

Yi Chen ◽

Yue Peng ◽

Wen Yong Liu ◽

Guang Sheng Zeng ◽

Xiang Gang Li ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Tensile Strength ◽

Lactic Acid ◽

Impact Strength ◽

Rheological Properties ◽

Poly Lactic Acid ◽

Melt Blending ◽

Aliphatic Polycarbonate ◽

Thermal Stability Of

Aliphatic polycarbonate Polycarbonate/poly (lactic acid)/(PPC/PLA) blends were prepared by melt blending, 1,2-propanediol isobutyl POSS (P-POSS) were added into the blends as a compatilizer and reinforcer. The morphologies, mechanical properties and rheological properties of blends were investigated systematically. The results showed that the adding of P-POSS could improve the compatibilization of PPC and PLA obviously. The thermal stability of the blends was enhanced but the crystallization was effected slightly. Moreover, the tensile strength and impact strength of blends exhibited a considerably increase.

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Mechanical, Thermal, and Morphological Properties of Thermoplastic Starch/Poly(lactic acid/Poly(butylene adipate-co-terephthalate) Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.970.312 ◽

2014 ◽

Vol 970 ◽

pp. 312-316

Author(s):

Sujaree Tachaphiboonsap ◽

Kasama Jarukumjorn

Keyword(s):

Lactic Acid ◽

Impact Strength ◽

Interfacial Adhesion ◽

Tensile Modulus ◽

Thermoplastic Starch ◽

Morphological Properties ◽

Poly Lactic Acid ◽

Melt Blending ◽

Elongation At Break ◽

Blending Method

Thermoplastic starch (TPS)/poly (lactic acid) (PLA) blend and thermoplastic starch (TPS)/poly (lactic acid) (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend were prepared by melt blending method. PLA grafted with maleic anhydride (PLA-g-MA) was used as a compatibilizer to improve the compatibility of the blends. As TPS was incorporated into PLA, elongation at break was increased while tensile strength, tensile modulus, and impact strength were decreased. Tensile properties and impact properties of TPS/PLA blend were improved with adding PLA-g-MA indicating the enhancement of interfacial adhesion between PLA and TPS. With increasing PBAT content, elongation at break and impact strength of TPS/PLA blends were improved. The addition of TPS decreased glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm) of PLA. Tgand Tcof TPS/PLA blend were decreased by incorporating PLA-g-MA. However, the presence of PBAT reduced Tcof TPS/PLA blend. Thermal properties of TPS/PLA/PBAT blends did not change with increasing PBAT content. SEM micrographs revealed that the compatibilized TPS/PLA blends exhibited finer morphology when compared to the uncompatibilized TPS/PLA blend.

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The combined plasticization of jute and tung oil anhydride for jute fiber reinforced poly(lactic acid) composites

Polymers and Polymer Composites ◽

10.1177/09673911211057697 ◽

2021 ◽

pp. 096739112110576

Author(s):

Ying Zhou ◽

Can Chen ◽

Lan Xie ◽

Xiaolang Chen ◽

Guangqiang Xiao ◽

...

Keyword(s):

Lactic Acid ◽

Physical And Mechanical Properties ◽

Complex Viscosity ◽

Poly Lactic Acid ◽

Melt Blending ◽

Sem Images ◽

Pseudoplastic Fluid ◽

Tung Oil ◽

Biodegradable Poly ◽

The Impact

In this work, novel plasticizing biodegradable poly (lactic acid) (PLA) composites were prepared by melt blending of jute and tung oil anhydride (TOA), and the physical and mechanical properties of PLA/jute/TOA composites were tested and characterized. The impact strength of PLA/jute/TOA composites significantly increases with increasing the content of TOA. The SEM images of fracture surface of PLA/jute/TOA composites become rough after the incorporation of TOA. In addition, TOA changes the crystallization temperature and decomposition process of PLA/jute/TOA composites. With increasing the amount of TOA, the value of storage modulus (E′) of PLA/jute/TOA composites gradually increases. The complex viscosity (η*) values for all samples reduce obviously with increasing the frequency, which means that the pure PLA and PLA/jute/TOA composites is typical pseudoplastic fluid. This is attributed to the formation of crosslinking, which restricts the deformation of the composites.

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Impact Toughness and Ductility Enhancement of Biodegradable Poly(lactic acid)/Poly(ε-caprolactone) Blends via Addition of Glycidyl Methacrylate

Advances in Materials Science and Engineering ◽

10.1155/2013/976373 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 20

Author(s):

Wei Kit Chee ◽

Nor Azowa Ibrahim ◽

Norhazlin Zainuddin ◽

Mohd Faizal Abd Rahman ◽

Buong Woei Chieng

Keyword(s):

Lactic Acid ◽

Impact Strength ◽

Glycidyl Methacrylate ◽

Interfacial Adhesion ◽

Tensile Modulus ◽

Sem Analysis ◽

Poly Lactic Acid ◽

Biodegradable Poly ◽

Interfacial Compatibility ◽

The Impact

Poly(lactic acid) (PLA)/poly(ε-caprolactone) (PCL) blends were prepared via melt blending technique. Glycidyl methacrylate (GMA) was added as reactive compatibilizer to improve the interfacial adhesion between immiscible phases of PLA and PCL matrices. Tensile test revealed that optimum in elongation at break of approximately 327% achieved when GMA loading was up to 3wt%. Slight drop in tensile strength and tensile modulus at optimum ratio suggested that the blends were tuned to be deformable. Flexural studies showed slight drop in flexural strength and modulus when GMA wt% increases as a result of improved flexibility by finer dispersion of PCL in PLA matrix. Besides, incorporation of GMA in the blends remarkably improved the impact strength. Highest impact strength was achieved (160% compared to pure PLA/PCL blend) when GMA loading was up to 3 wt%. SEM analysis revealed improved interfacial adhesion between PLA/PCL blends in the presence of GMA. Finer dispersion and smooth surface of the specimens were noted as GMA loading increases, indicating that addition of GMA eventually improved the interfacial compatibility of the nonmiscible blend.

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Effects of walnut shell powders on the morphology and the thermal and mechanical properties of poly(lactic acid)

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705719828801 ◽

2019 ◽

Vol 33 (10) ◽

pp. 1383-1395

Author(s):

Hongjuan Zheng ◽

Zhengqian Sun ◽

Hongjuan Zhang

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Property Testing ◽

Walnut Shell ◽

Poly Lactic Acid ◽

Thermal And Mechanical Properties ◽

Scanning Calorimetry ◽

Elongation At Break ◽

Heat Distortion Temperature ◽

Testing Techniques

Poly(lactic acid) (PLA) has good environmental compatibility, however, its high brittleness, slow rate of crystallization, and low heat distortion temperature restrict its widespread use. To overcome these limitations, in this study, PLA was mixed with walnut shell (WS) powders. The effects of WS powders on the morphology and the thermal and mechanical properties of PLA were investigated. The products were characterized by differential scanning calorimetry (DSC), infrared (IR) spectroscopy, polarizing optical microscopy (POM), and various mechanical property testing techniques. The results showed that WS powders had a significant effect on the morphology and the thermal and mechanical properties of PLA. The tensile strength, impact strength, and elongation at break of the PLA/WS composites first increased and then decreased with the increasing addition of WS powders. When the addition of WS powders was about 0.5 wt%, they reached maximum values of 51.2 MPa, 23.3 MPa, and 19.0%, respectively. Compared with neat PLA, the spherulite grain size of the composites could be reduced and many irregular polygons were formed during crystallization. The melting, cold crystallization, and glass-transition temperatures of the composites were lower than those of neat PLA.

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