scholarly journals Injection-molded poly(L-lactic acid)/poly(D-lactic acid) blends: Thermal and mechanical properties

2019 ◽  
Author(s):  
Yottha Srithep ◽  
Dutchanee Pholharn ◽  
John Morris
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Thermal And Mechanical Properties ◽  
Injection Molded

Tailoring the thermal and mechanical properties of injection‐molded poly (lactic acid) parts through annealing

2020 ◽  
Vol 138 (2) ◽  
pp. 49648 ◽  
Author(s):  
Guili Li ◽  
Beijing Yang ◽  
Wenjuan Han ◽  
Haimei Li ◽  
Zhan Kang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Thermal And Mechanical Properties ◽  
Injection Molded

Effect of the Introduction of Fish Collagen on the Thermal and Mechanical Properties of Poly(lactic acid)

2015 ◽  
Vol 54 (43) ◽  
pp. 10945-10951 ◽  
Author(s):  
Hui Ma ◽  
Jiajia Shen ◽  
Qun Yang ◽  
Jie Zhou ◽  
Shuangshuang Xia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Thermal And Mechanical Properties ◽  
Fish Collagen

Thermal and mechanical properties of plasticized poly(L-lactic acid)

2003 ◽  
Vol 90 (7) ◽  
pp. 1731-1738 ◽  
Author(s):  
Massimo Baiardo ◽  
Giovanna Frisoni ◽  
Mariastella Scandola ◽  
Michel Rimelen ◽  
David Lips ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Thermal And Mechanical Properties

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

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.

Weldability of pipe grade polyethylenes as realized from thermal and mechanical properties assessments

2016 ◽  
Vol 36 (8) ◽  
pp. 853-860 ◽  
Author(s):  
Vahabodin Goodarzi ◽  
Zahed Ahmadi ◽  
Mohammad Reza Saeb ◽  
Farkhondeh Hemmati ◽  
Mehdi Ghaffari ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Molecular Weight ◽  
Aging Process ◽  
Pipe Production ◽  
Lamellar Thickness ◽  
Thermal And Mechanical Properties ◽  
Scanning Calorimetry ◽  
Injection Molded ◽  
The One

Abstract Since polyethylene (PE) has been widely accepted for the production of high-pressure fluid conveying pipelines, studies devoted to weldability of PE connections were always of major importance. In this study, two industrial PE grades designed for pipe production, namely PE80 and PE100, were injection molded, cut, and then welded as PE100-PE100, PE100-PE80, and PE80-PE80. The heat-welded joints were assessed by differential scanning calorimetry and tensile measurements. The results obtained from thermal and mechanical analyses were compared with equivalents for aged samples. Thermal analysis revealed that the melting point of the PE100-PE100 sample is obviously larger than the one for the PE80-PE80 joint, for the PE80 chains deteriorate the crystallization of PE100. Further, the PE80-PE80 sample showed the lowest lamellar thickness and crystalline molecular weight among the studied joints. The aging process was found to increase lamellar thickness and molecular weight, though in the PE100-PE100 sample such quantities very limitedly increased. The yield stress of aged joints was higher than that for just-prepared samples, while an inverse trend was seen for strain at break. From a practical viewpoint, the PE100-PE100 welds offer better properties.

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