Synthesis, properties, and crystallization of the alternating stereocopolymer poly(l-lactic acid-alt-d-lactic acid) [syndiotactic poly(lactic acid)] and its blend with isotactic poly(lactic acid)

2018 ◽  
Vol 9 (18) ◽  
pp. 2446-2457 ◽  
Author(s):  
Hideto Tsuji ◽  
Yuki Arakawa
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Synthesis Properties

The alternating stereocopolymer poly(l-lactic acid-alt-d-lactic acid) or syndiotactic poly(lactic acid) was successfully synthesized by the condensation of the l-lactic acid-d-lactic acid dimer.

scholarly journals Synthesis, Properties, and Enzymatic Hydrolysis of Poly(lactic acid)-Co-Poly(propylene adipate) Block Copolymers Prepared by Reactive Extrusion

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4121
Author(s):  
Zoi Terzopoulou ◽  
Alexandra Zamboulis ◽  
Dimitrios N. Bikiaris ◽  
Miguel Angel Valera ◽  
Ana Mangas
Keyword(s):  
Lactic Acid ◽  
Block Copolymers ◽  
Reactive Extrusion ◽  
Poly Lactic Acid ◽  
Synthesis Properties ◽  
High Production ◽  
High Production Cost ◽  
Poly Propylene ◽  
Hydrolysis Of ◽  
Economical Alternative

Poly(lactic acid) (PLA) is a biobased polyester with ever-growing applications in the fields of packaging and medicine. Despite its popularity, it suffers from inherent brittleness, a very slow degradation rate and a high production cost. To tune the properties of PLA, block copolymers with poly(propylene adipate) (PPAd) prepolymer were prepared by polymerizing L-lactide and PPAd oligomers via reactive extrusion (REX) in a torque rheometer. The effect of reaction temperature and composition on the molecular weight, chemical structure, and physicochemical properties of the copolymers was studied. The introduction of PPAd successfully increased the elongation and the biodegradation rate of PLA. REX is an efficient and economical alternative method for the fast and continuous synthesis of PLA-based copolymers with tunable properties.

Polylactide [poly(lactic acid)]: synthesis, properties and applications

Polimery ◽  
2003 ◽  
Vol 48 (01) ◽  
pp. 16-27 ◽  
Author(s):  
ANDRZEJ DUDA ◽  
STANISLAW PENCZEK
Keyword(s):  
Lactic Acid ◽  
Acid Synthesis ◽  
Poly Lactic Acid ◽  
Synthesis Properties

Electrical Properties of Heat-Treated Poly-Lactic Acid

2011 ◽  
Vol 131 (5) ◽  
pp. 395-400 ◽  
Author(s):  
Toru Oi ◽  
Katsuyoshi Shinyama ◽  
Shigetaka Fujita
Keyword(s):  
Lactic Acid ◽  
Electrical Properties ◽  
Poly Lactic Acid ◽  
Heat Treated

Dielectric Breakdown Properties of Poly-Lactic Acid with Spherulites Growth

2014 ◽  
Vol 134 (4) ◽  
pp. 237-242
Author(s):  
Naru Matsugasaki ◽  
Katsuyoshi Shinyama ◽  
Shigetaka Fujita
Keyword(s):  
Lactic Acid ◽  
Dielectric Breakdown ◽  
Poly Lactic Acid

Characterizing Attapulgite-Reinforced Nanocomposites of Poly(lactic acid)

2020 ◽  
Vol 62 (6) ◽  
pp. 732-743
Author(s):  
Chi-Hui Tsou ◽  
Jipeng Guo ◽  
Ji-Ang Lei ◽  
Manuel Reyes De Guzman ◽  
Maw-Cherng Suen
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid

Effect of Polyethylene Glycol in Nanocellulose/PLA Composites

2019 ◽  
Vol 821 ◽  
pp. 89-95
Author(s):  
Wanasorn Somphol ◽  
Thipjak Na Lampang ◽  
Paweena Prapainainar ◽  
Pongdhorn Sae-Oui ◽  
Surapich Loykulnant ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Polyethylene Glycol ◽  
Aspect Ratio ◽  
Mechanical Performance ◽  
Tensile Modulus ◽  
Poly Lactic Acid ◽  
Solvent Casting ◽  
Casting Method ◽  
Mediated Oxidation

Poly (lactic acid) or PLA was reinforced by nanocellulose and polyethylene glycol (PEG), which were introduced into PLA matrix from 0 to 3 wt.% to enhance compatibility and strength of the PLA. The nanocellulose was prepared by TEMPO-mediated oxidation from microcrystalline cellulose (MCC) powder and characterized by TEM, AFM, and XRD to reveal rod-like shaped nanocellulose with nanosized dimensions, high aspect ratio and high crystallinity. Films of nanocellulose/PEG/PLA nanocomposites were prepared by solvent casting method to evaluate the mechanical performance. It was found that the addition of PEG in nanocellulose-containing PLA films resulted in an increase in tensile modulus with only 1 wt% of PEG, where higher PEG concentrations negatively impacted the tensile strength. Furthermore, the tensile strength and modulus of nanocellulose/PEG/PLA nanocomposites were higher than the PLA/PEG composites due to the existence of nanocellulose chains. Visual traces of crazing were detailed to describe the deformation mechanism.

scholarly journals Poly(lactic acid)—Mass production, processing, industrial applications, and end of life

2016 ◽  
Vol 107 ◽  
pp. 333-366 ◽  
Author(s):  
E. Castro-Aguirre ◽  
F. Iñiguez-Franco ◽  
H. Samsudin ◽  
X. Fang ◽  
R. Auras
Keyword(s):  
Lactic Acid ◽  
End Of Life ◽  
Mass Production ◽  
Industrial Applications ◽  
Poly Lactic Acid
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