Poly(l-lactic acid)-polyethylene glycol-poly(l-lactic acid) triblock copolymer: A novel macromolecular plasticizer to enhance the crystallization of poly(l-lactic acid)

2017 ◽  
Vol 97 ◽  
pp. 272-281 ◽  
Author(s):  
Le Li ◽  
Zhi-Qiang Cao ◽  
Rui-Ying Bao ◽  
Bang-Hu Xie ◽  
Ming-Bo Yang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Polyethylene Glycol ◽  
Triblock Copolymer

scholarly journals Effect of molecular weight of polyethylene glycol on crystallization behaviors, thermal properties and tensile performance of polylactic acid stereocomplexes

RSC Advances ◽  
2020 ◽  
Vol 10 (69) ◽  
pp. 42120-42127
Author(s):  
Ruilong Li ◽  
Yifan Wu ◽  
Zhuyu Bai ◽  
Jianbing Guo ◽  
Xiaolang Chen
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Polyethylene Glycol ◽  
Polylactic Acid ◽  
Triblock Copolymer ◽  
Thermal And Mechanical Properties ◽  
Crystallization Behaviors ◽  
Tensile Performance

In this work, the poly(d-lactic acid)–polyethylene glycol–poly(d-lactic acid) (PDLA–PEG–PDLA) triblock copolymer as a novel modification agent was incorporated into poly(l-lactic acid) (PLLA) to improve the thermal and mechanical properties of PLLA.

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 Synthesis of polylactic acid-diol (PLA-diol) from lactic acid and 1,4-butanediol

2016 ◽  
Vol 19 (4) ◽  
pp. 58-65
Author(s):  
Ha Thi Thai La
Keyword(s):  
Molecular Weight ◽  
Lactic Acid ◽  
Polyethylene Glycol ◽  
1H Nmr ◽  
Biodegradable Polymer ◽  
Average Molecular Weight ◽  
Chain Extension ◽  
Structure And Properties ◽  
Chain Reaction ◽  
A Chain

In this research, the PLA-diol were synthesized from lactic acid (LA) and 1.4 butanediols (BD) with a tin octoate Sn(Oct)2 catalyst at a temperature of 180 °C and the pressure 5 mmHg. The structure and properties of PLA-diol are analyzed by the following methods: GPC, 1H-NMR and DSC. As a result, with the change in the content of Sn (Oct)2 from 0.1 to 1.0%, the molecular weight Mn of PLA - diol increased gradually from 4.119,2 to 7.359,6 g / mol . In addition, the BD content increased from 2.0% to 5.0%, the average molecular weight of the product decreased gradually from 7.536,9 g / mol to 4.735 g / mol, respectively. This change will affect the ability to use PLA-diol in the next denaturation research to apply in the field of biodegradable polymer such as copolymer with polyurethane, copolymer with polyethylene glycol diacid, or chain extension with other polymer in a chain reaction,...

Biodegradable Poly-D,L-Lactic Acid-Polyethylene Glycol Block Copolymers as a BMP Delivery System for Inducing Bone

2001 ◽  
Vol 83 ◽  
pp. S1-92-S1-98 ◽  
Author(s):  
Naoto Saito ◽  
Takao Okada ◽  
Hiroshi Horiuchi ◽  
Narumichi Murakami ◽  
Jun Takahashi ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Polyethylene Glycol ◽  
Block Copolymers ◽  
Delivery System ◽  
Biodegradable Poly

scholarly journals Metabolism of propane-1:2-diol infused into the rumen of sheep

1972 ◽  
Vol 27 (3) ◽  
pp. 553-560 ◽  
Author(s):  
J. L. Clapperton ◽  
J. W. Czerkawski
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acids ◽  
Acetic Acid ◽  
Lactic Acid ◽  
Polyethylene Glycol ◽  
Energy Metabolism ◽  
Heat Production ◽  
Volatile Fatty Acids ◽  
Carbon Dioxide Production ◽  
Total Volatile

1. Propane-1:2-diol (loog/d) was infused through a cannula into the rumen of sheep receiving a ration of hay and dried grass. The concentration of volatile fatty acids, propanediol, lactic acid and of added polyethylene glycol, and the pH of the rumen contents were measured. The energy metabolism of the sheep was also determined.2. Most of the propanediol disappeared from the rumen within 4 h of its infusion. The infusion of propanediol resulted in a 10% decrease in the concentration of total volatile acids; the concentration of acetic acid decreased by about 30%, that of propionic acid increased by up to 60% and there was no change in the concentration of butyric acid.3. The methane production of the sheep decreased by about 9% after the infusion of propanediol and there were increases in the oxgyen consumption, carbon dioxide production and heat production of the animals; each of these increases was equivalent to about 40% of the theoretical value for the complete metabolism of 100 g propanediol.4. It is concluded that, when propanediol is introduced into the rumen, a proportion is metabolized in the rumen and a large proportion is absorbed directly. Our thanks are due to Dr J. H. Moore for helpful discussions, to Mr D. R. Paterson, Mr J. R. McDill and Mr C. E. Park for looking after the animals and to Miss K. M. Graham, Miss A. T. McKay and Mrs C. E. Ramage for performing the analyses.

Multimodal tumor imaging by iron oxides and quantum dots formulated in poly (lactic acid)-d-alpha-tocopheryl polyethylene glycol 1000 succinate nanoparticles

Biomaterials ◽  
2011 ◽  
Vol 32 (11) ◽  
pp. 2969-2978 ◽  
Author(s):  
Yang Fei Tan ◽  
Prashant Chandrasekharan ◽  
Dipak Maity ◽  
Cai Xian Yong ◽  
Kai-Hsiang Chuang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Lactic Acid ◽  
Polyethylene Glycol ◽  
Iron Oxides ◽  
Tumor Imaging ◽  
Poly Lactic Acid ◽  
Polyethylene Glycol 1000
Sign in / Sign up

Export Citation Format

Share Document