Effect of molding temperature on the impact properties of biodegradable poly (lactic acid)

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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Biodegradable poly (lactic acid)/poly (butylene succinate) fibers with high elongation for health care products

Textile Research Journal ◽

10.1177/0040517517708538 ◽

2017 ◽

Vol 88 (15) ◽

pp. 1735-1744 ◽

Cited By ~ 5

Author(s):

Elwathig AM Hassan ◽

Salah Eldin Elarabi ◽

You Wei ◽

Muhuo Yu

Keyword(s):

Lactic Acid ◽

Melt Spinning ◽

Strength Loss ◽

Poly Lactic Acid ◽

Butylene Succinate ◽

Morphological Studies ◽

Biodegradable Poly ◽

Spinning Process ◽

High Elongation ◽

The Impact

Poly (lactic acid)/poly (butylene succinate) (PLA/PBS) blend fibers with high miscibility and improved elongation with comparable mechanical strength were fabricated using the melt spinning process in order to reduce the impact on the environment by long-lasting plastics-based composites. The PLA/PBS blend fibers produced in different ratios have revealed high miscibility, which has been confirmed by morphological studies. The thermal properties showed the melting temperature of PLA at 167.13℃ and PLA/PBS blends at 169.18℃, and an increased content of PBS in blends also led to improved crystallinity. Importantly, during tensile testing, it is observed that the fracture behavior of the specimen changed from brittle fracture of neat PLA to ductile fracture of the blends, as demonstrated by the significant increase in the elongation at break with comparable tensile strength and modulus. Furthermore, the washing fastness, rubbing fastness, exhaustion values, strength loss, and shade depth ( K/ S value) for the knitted and dyed fibers were explored. It was found that the exhaustion and K/ S value increased when the temperature increased, but the strength decreased. The exhaustion and K/ S value of PLA/PBS blend fabrics improved compared to pure PLA fabric, with excellent washing and rubbing fastness.

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Experimental and Numerical Measurement of the Impact Strength of Poly-lactic Acid through a Low-velocity Impact

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1094/1/012171 ◽

2021 ◽

Vol 1094 (1) ◽

pp. 012171

Author(s):

Ali Jasim Mohammed Al-Behadili ◽

Bashar Owaid Bedaiwi

Keyword(s):

Lactic Acid ◽

Impact Strength ◽

Low Velocity Impact ◽

Poly Lactic Acid ◽

Low Velocity ◽

Velocity Impact ◽

The Impact

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Nonisothermal melt and cold crystallization behaviors of biodegradable poly(lactic acid)/Ti3C2Tx MXene nanocomposites

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-020-10502-7 ◽

2021 ◽

Author(s):

Qian Zhao ◽

Bowen Wang ◽

Chenyuan Qin ◽

Qiuxuan Li ◽

Chuntai Liu ◽

...

Keyword(s):

Lactic Acid ◽

Cold Crystallization ◽

Poly Lactic Acid ◽

Crystallization Behaviors ◽

Biodegradable Poly

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Poly(Lactic Acid)–Poly(Butylene Succinate)–Sugar Beet Pulp Composites; Part I: Mechanics of Composites with Fine and Coarse Sugar Beet Pulp Particles

Polymers ◽

10.3390/polym13152531 ◽

2021 ◽

Vol 13 (15) ◽

pp. 2531

Author(s):

Rodion Kopitzky

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Sugar Beet ◽

Cell Structure ◽

Sugar Beet Pulp ◽

Poly Lactic Acid ◽

Butylene Succinate ◽

Fracture Patterns ◽

Beet Pulp ◽

The Impact

Sugar beet pulp (SBP) is a residue available in large quantities from the sugar industry, and can serve as a cost-effective bio-based and biodegradable filler for fully bio-based compounds based on bio-based polyesters. The heterogeneous cell structure of sugar beet suggests that the processing of SBP can affect the properties of the composite. An “Ultra-Rotor” type air turbulence mill was used to produce SBP particles of different sizes. These particles were processed in a twin-screw extruder with poly(lactic acid) (PLA) and poly(butylene succinate) (PBS) and fillers to granules for possible marketable formulations. Different screw designs, compatibilizers and the use of glycerol as a thermoplasticization agent for SBP were also tested. The spherical, cubic, or ellipsoidal-like shaped particles of SBP are not suitable for usage as a fiber-like reinforcement. In addition, the fineness of ground SBP affects the mechanical properties because (i) a high proportion of polar surfaces leads to poor compatibility, and (ii) due to the inner structure of the particulate matter, the strength of the composite is limited to the cohesive strength of compressed sugar-cell compartments of the SBP. The compatibilization of the polymer–matrix–particle interface can be achieved by using compatibilizers of different types. Scanning electron microscopy (SEM) fracture patterns show that the compatibilization can lead to both well-bonded particles and cohesive fracture patterns in the matrix. Nevertheless, the mechanical properties are limited by the impact and elongation behavior. Therefore, the applications of SBP-based composites must be well considered.

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