Cross-Linking Poly(lactic acid) Film Surface by Neutral Hyperthermal Hydrogen Molecule Bombardment

2015 ◽  
Vol 63 (49) ◽  
pp. 10604-10610 ◽  
Author(s):  
Wangli Du ◽  
Hong Shao ◽  
Zhoukun He ◽  
Changyu Tang ◽  
Yu Liu ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Hydrogen Molecule ◽  
Film Surface ◽  
Poly Lactic Acid ◽  
Cross Linking

Fabrication of High Toughness Poly(lactic acid) by Combining Plasticization with Cross-linking Reaction

2012 ◽  
Vol 51 (21) ◽  
pp. 7273-7278 ◽  
Author(s):  
Zhongjie Ren ◽  
Huihui Li ◽  
Xiaoli Sun ◽  
Shouke Yan ◽  
Yuming Yang
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Cross Linking ◽  
High Toughness

scholarly journals Nanosilk-Grafted Poly(lactic acid) Films: Influence of Cross-Linking on Rheology and Thermal Stability

ACS Omega ◽  
2017 ◽  
Vol 2 (10) ◽  
pp. 7071-7084 ◽  
Author(s):  
Melakuu Tesfaye ◽  
Rahul Patwa ◽  
Prodyut Dhar ◽  
Vimal Katiyar
Keyword(s):  
Thermal Stability ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Cross Linking

Preparation and characterization of chitosan grafted poly(lactic acid) films for biomedical composites

2020 ◽  
Vol 40 (4) ◽  
pp. 333-341
Author(s):  
Tonmoy Debnath ◽  
Md. Sazedul Islam ◽  
Sirajul Hoque ◽  
Papia Haque ◽  
Mohammed Mizanur Rahman
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Polymer Composites ◽  
Average Molecular Weight ◽  
Krebs Cycle ◽  
Hydrolytic Degradation ◽  
Film Surface ◽  
Poly Lactic Acid ◽  
Aqueous Environment ◽  
Weight Retention

AbstractPolymer composites offer a great advantage in biomedical field over the traditional materials used like, metal, ceramics, or polymer alone. Polymer composites provide tailor-made facilities to design required physiological and mechanical properties in biomedical products. Poly(lactic acid) (PLA) is a popular aliphatic polyester used in various biomedical products because they have a renewable source and after resorption they enter well into the Krebs cycle of the human body. However, PLA suffers from hydrolysis and subsequent weight loss in aqueous environment. To improve the hydrolytic properties of hydrophobic PLA and to incorporate the biocompatibility from chitosan (CS) into it, in this study CS has been grafted onto PLA film. CS with 78% of degree of deacetylation and viscosity average molecular weight of about 8,31,760 Da was grafted onto hydrolyzed PLA film surface. Kjeldahl analysis confirmed the attachment of CS onto the PLA films. From thermal stability analysis, it was observed that percentage of weight retention at 600°C of the CS-g-PLA was around 15% higher than that of pure PLA. The mechanical properties of final CS-grafted-PLA composites showed more resistance to hydrolytic degradation than that of pure PLA film.

Novel Applications for Biomaterials: The Case of Remediation of Wine Taints Using Poly-Lactic Acid Polymer

2015 ◽  
Vol 749 ◽  
pp. 70-73 ◽  
Author(s):  
Andreea Botezatu ◽  
Gary James Pickering
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Lactic Acid ◽  
Solid Phase ◽  
Alcoholic Beverage ◽  
Film Surface ◽  
Gas Chromatography Mass Spectrometry ◽  
Poly Lactic Acid ◽  
Chromatography Mass Spectrometry ◽  
Before And After

Wine is the world’s oldest alcoholic beverage and the most consumed in at least 20 countries. However, taints detract from its quality and acceptance, significantly reducing the value of wine. In this study we investigated the capacity of a poly-lactic acid (PLA) biopolymer to reduce concentrations of four odorants responsible for tainting many red wines: isopropyl-methoxypyrazine (IPMP), isobutyl–methoxypyrazine (IBMP), 4-ethylphenol (4-EP) and 4-ethylguaiacol (4-EG). Red wine was spiked with either IPMP [20 ng/L] and IBMP [20 ng/L] (Study 1) or 4-EP [200 ug/L] and 4-EG [200 ug/L] (Study 2) and then treated with a PLA film [surface area 350 cm2/L]. Solid Phase Micro-Extraction Multi-Dimensional Gas Chromatography–Mass Spectrometry and Gas Chromatography-Mass Spectrometry were used to measure the methoxypyrazines and ethylphenols, respectively, both before and after treatment with PLA. Results showed significant reductions in all of the target odorants after 8hrs treatment: IPMP (51%), IBMP (26%), 4-EP (21%) and 4-EG (20%). Taken overall, the data suggest potential for the use of PLA in treating common wine faults, particularly ‘ladybug taint’, which is caused by elevated levels of IPMP.

Eco-composite from poly(lactic acid) and bamboo fiber

Holzforschung ◽  
2004 ◽  
Vol 58 (5) ◽  
pp. 529-536 ◽  
Author(s):  
Seung-Hwan Lee ◽  
Tsutomu Ohkita ◽  
Kazuo Kitagawa
Keyword(s):  
Lactic Acid ◽  
Water Sorption ◽  
Bamboo Fiber ◽  
Poly Lactic Acid ◽  
Cross Linking ◽  
Dicumyl Peroxide ◽  
Thermal Flow ◽  
Molecular Motions ◽  
Matrix Resin ◽  
Scanning Electron

Abstract Bamboo fiber-filled poly(lactic acid) (PLA) eco-composites were prepared by mechano-chemical compositing with bamboo fiber (BF)-esterified maleic anhydride (MA) (BF-e-MA) in the presence of dicumyl peroxide as a radical initiator. Tensile properties of the composites were improved by adding BF-e-MA and the dicumyl peroxide. A sufficient effect of the addition on the tensile property of the composites was observed even in the presence of the dicumyl peroxide of 0.25%. However, the composites with BF-e-MA usually showed a higher activation energy for thermal flow, indicating that their flow became more difficult, because molecular motions were rather suppressed by cross-linking of BF-e-MA with the PLA matrix resin. The crystallization temperature of PLA became higher by the addition of BF and BF-e-MA in non-isothermal crystallization. It was confirmed by scanning electron microscope and polarizing microscope observation that interfacial properties between BF and PLA were improved after the addition of BF-e-MA. A diffusion coefficient (D) of water in the PLA/BF composites with BF-e-MA was smaller than that in the composites without BF-e-MA. An equilibrium water-sorption amount (M∞) was higher in the order of composites without BF-e-MA>composites with BF-e-MA>pure PLA.

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
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