scholarly journals Catalytic Performances of Platinum Containing PLLA Macrocomplex in the Hydrogenation of α,β-Unsaturated Carbonyl Compounds

2019 ◽  
Vol 9 (16) ◽  
pp. 3243
Author(s):  
Mattia Bartoli ◽  
Luca Rosi ◽  
Benedetta Mini ◽  
Giorgio Petrucci ◽  
Elisa Passaglia ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Carbonyl Compounds ◽  
Metal Ion ◽  
High Selectivity ◽  
Poly Lactic Acid ◽  
One Step ◽  
Polymeric Ligand ◽  
Catalytic Cycles ◽  
Bond Hydrogenation ◽  
Catalytic Performances

The synthesis of a bipyridine poly(lactic acid) carboxylic end-capped macroligand coordinated to a platinum center was reported. The reaction between the metal ion and the polymeric ligand was run in a very efficient way through a one-step synthesis and the complex was tested for selective hydrogenation of α,β-carbonyl compounds. High selectivity was proven for double bond hydrogenation of 2-cyclohexen-1-one (up to 99%) and the production of 1-butanol from (E)-but-2-enal. Moreover, the catalytic system was still active after three catalytic cycles.

High hydrophobic poly(lactic acid) foams impregnating one-step Si–F modified lignin nanoparticles for oil/organic solvents absorption

2021 ◽  
Vol 25 ◽  
pp. 100730
Author(s):  
Hui Ding ◽  
Weijun Yang ◽  
Wenhao Yu ◽  
Tianxi Liu ◽  
Haigang Wang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Organic Solvents ◽  
Poly Lactic Acid ◽  
One Step ◽  
Modified Lignin

Effects of Metal Ion Type on Ionomer-Assisted Reactive Toughening of Poly(lactic acid)

2013 ◽  
Vol 52 (13) ◽  
pp. 4787-4793 ◽  
Author(s):  
Hongzhi Liu ◽  
Xiaojie Guo ◽  
Wenjia Song ◽  
Jinwen Zhang
Keyword(s):  
Lactic Acid ◽  
Metal Ion ◽  
Poly Lactic Acid

scholarly journals Properties of Poly(Lactic Acid) Filled with Hydrophobic Cellulose/SiO2 Composites

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Kittithorn Lertphirun ◽  
Kawee Srikulkit
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Hydrolytic Degradation ◽  
Poly Lactic Acid ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw ◽  
Hydrolysis Of Cellulose ◽  
One Step ◽  
Hydrolysis Of

Hydrophobic cellulose/SiO2 composites were prepared. Resultant hydrophobic cellulose/SiO2 composites were melt mixed with PLA using a twin-screw extruder to obtain 10 wt% masterbatch. Again, 10 wt% masterbatch was melt mixed with virgin PLA, resulting in PLA containing hydrophobic cellulose/SiO2 at various contents (1 wt%, 3 wt%, and 5 wt%) using a twin-screw extruder (barrel zone temperature: 150/160/170/180/190°C (die zone)). Injection-molded samples were prepared for mechanical properties evaluation. Results showed that poor mechanical properties found at low percent loadings were associated with a significant depolymerization of masterbatch composition due to twice thermal treatments. Note that 10 wt% masterbatch was subjected to injection molding straight away in a one-step process. Results showed that 10 wt% hydrophobic cellulose/SiO2/PLA composites exhibited mechanical properties equivalent to neat PLA. Importantly, the addition of hydrophobic cellulose/SiO2 at high percent loading could favor landfill degradation of PLA via water absorption ability of cellulose. It was expected that enzymatic hydrolysis of cellulose resulted in the formation of lactic acid and silicic acid which consequently catalyzed the hydrolytic degradation (acid hydrolysis) of PLA. The hydrolytic degradation produced carboxylic acid end group which further accelerated the degradation rate.

Sheets of branched poly(lactic acid) obtained by one-step reactive extrusion–calendering process: physical aging and fracture behavior

2014 ◽  
Vol 49 (11) ◽  
pp. 4093-4107 ◽  
Author(s):  
J. Cailloux ◽  
O. O. Santana ◽  
E. Franco-Urquiza ◽  
J. J. Bou ◽  
F. Carrasco ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Fracture Behavior ◽  
Physical Aging ◽  
Reactive Extrusion ◽  
Poly Lactic Acid ◽  
One Step

scholarly journals One-step compatibilization of poly(lactic acid) and tannin via reactive extrusion

2020 ◽  
Vol 191 ◽  
pp. 108603 ◽  
Author(s):  
Jingjing Liao ◽  
Nicolas Brosse ◽  
Sandrine Hoppe ◽  
Guanben Du ◽  
Xiaojian Zhou ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Reactive Extrusion ◽  
Poly Lactic Acid ◽  
One Step

scholarly journals Effect of blending procedures and reactive compatibilizers on the properties of biodegradable poly(butylene adipate-co-terephthalate)/poly(lactic acid) blends

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dandan Wu ◽  
Anping Huang ◽  
Jie Fan ◽  
Renwei Xu ◽  
Peng Liu ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Tensile Properties ◽  
Phase Interface ◽  
Polymer Materials ◽  
Poly Lactic Acid ◽  
Practical Application ◽  
Biodegradable Poly ◽  
Phase Size ◽  
One Step ◽  
The One

AbstractThe effect of Joncryl ADR®-4368 (abbreviated ADR) and dicumyl peroxide (DCP) on poly(butylene adipate-co-terephthalate) (PBAT)/poly(lactic acid) (PLA) blend was investigated. Two different blending procedures were adopted: (1) one-step blending of all components for 8 min; (2) premixing of PBAT and ADR (or DCP) for 4 min followed by addition of PLA blending for 4 min. ADR and DCP were effective compatibilizers for the PBAT/PLA blend by one-step blending which were confirmed by improving the phase interface between PBAT and PLA, decreasing the dispersed phase size, increasing the elasticity, viscosity and tensile strength. Moreover, the addition of ADR into PBAT/PLA blend by two-step blending was more efficient than the one-step blending based on refined morphology and further increased tensile properties. The two-step blending was beneficial to produce a larger amount of PBAT-graft-PLA (PBAT-g-PLA) copolymers at the phase interface. However, DCP was added to the PBAT/PLA blend by the two-step blending which showed lower properties than one-step blending. DCP triggered free branching reactions in a fast way. Based on the character of compatibilizers, choosing properly blending procedures can enlarge the tensile properties. These results would be interesting for industrial polymer materials, and may be importance to the wider practical application of PBAT/PLA blends.

scholarly journals Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis

2013 ◽  
Vol 7 (3) ◽  
pp. 304-318 ◽  
Author(s):  
J. Cailloux ◽  
O. O. Santana ◽  
E. Franco-Urquiza ◽  
J. J. Bou ◽  
F. Carrasco ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Reactive Extrusion ◽  
Poly Lactic Acid ◽  
Melt Rheology ◽  
One Step

scholarly journals Poly(Lactic Acid)/Poly(Butylene Succinate) Dual-Layer Membranes With Cellulose Nanowhisker for Heavy Metal Ion Separation

2021 ◽  
Author(s):  
Lau K Kian ◽  
Mohammad Jawaid ◽  
Mohamed Mahmoud Nasef
Keyword(s):  
Heavy Metal ◽  
Lactic Acid ◽  
Water Vapor ◽  
Metal Ions ◽  
Metal Ion ◽  
Poly Lactic Acid ◽  
Morphological Examination ◽  
Butylene Succinate ◽  
Integrated Method ◽  
Cellulose Nanowhisker

Abstract In this study, poly(lactic acid) (PLA)/poly(butylene succinate) (PBS) dual-layer membranes filled with cellulose nanowhisker (CNWs), were fabricated by employing an integrated method combining water vapor-induced and crystallization-induced phase inversions. Four membranes (denoted as C-neat, C-I, C-II, and C-III) loaded with CNWs in the range of 0-3 wt% were prepared and characterized using various materials research aspects. The use of CNWs fillers was found to synergize the precipitation of the polymer layers in the integrated water vapor-induced and crystallization-induced method. With morphological examination, the C-III membrane showed prominent and well-laminated two layers structure, evidencing the great precipitating effect of 3 wt% CNWs on the crystallization the polymeric layers. The increase in CNWs loadings was found to improve the membrane porosity with, which was accompanied by a decrease in the pore size. The heat resistance of C-neat membrane was enhanced by CNWs loading of 1 wt% (C-I) whereas it decreased with loadings of 2 and 3 wt% (C-II and C-III) due to flaming behaviour of sulphated nanocellulose. Furthermore, The C-III membrane displayed the best mechanical properties in with respect to tensile strength, elongation at break and Young’s modulus compared to other membrane samples. For wastewater filtration performance, the continuous operation test showed that C-III membrane exhibited the highest removal efficiency for both Co2+ and Ni2+ metal ions reaching 83 and 84%, respectively. Thus, it can be concluded that CNWs filled dual-layer membranes have a strong potential for future development for the removal of heavy metal ions from wastewater streams.

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