scholarly journals Improved Performance of Environmentally Friendly Blends of Biobased Polyethylene and Kraft Lignin Compatibilized by Reactive Extrusion with Dicumyl Peroxide

2021 ◽  
pp. 2100196
Author(s):  
Sandra Rojas‐Lema ◽  
Juan Ivorra‐Martinez ◽  
Diego Lascano ◽  
Daniel Garcia‐Garcia ◽  
Rafael Balart
Keyword(s):  
Environmentally Friendly ◽  
Reactive Extrusion ◽  
Kraft Lignin ◽  
Dicumyl Peroxide ◽  
Improved Performance

scholarly journals Engineering Sr-doping for enabling long-term stable FAPb1−xSrxI3 quantum dots with 100% photoluminescence quantum yield

2021 ◽  
Vol 9 (5) ◽  
pp. 1555-1566
Author(s):  
Andrés F. Gualdrón-Reyes ◽  
David F. Macias-Pinilla ◽  
Sofia Masi ◽  
Carlos Echeverría-Arrondo ◽  
Said Agouram ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Toxic Metals ◽  
Environmentally Friendly ◽  
Photoluminescence Quantum Yield ◽  
Improved Performance ◽  
Pb Substitution

The Pb substitution in quantum dots (PQDs) with lesser toxic metals has been widely searched to be environmentally friendly, and be of comparable or improved performance compared to the lead-perovskite.

scholarly journals Effect of Dicumyl Peroxide on a Poly(lactic acid) (PLA)/Poly(butylene succinate) (PBS)/Functionalized Chitosan-Based Nanobiocomposite for Packaging: A Reactive Extrusion Study

ACS Omega ◽  
2018 ◽  
Vol 3 (10) ◽  
pp. 13298-13312 ◽  
Author(s):  
Monika ◽  
Akhilesh Kumar Pal ◽  
Siddharth Mohan Bhasney ◽  
Purabi Bhagabati ◽  
Vimal Katiyar
Keyword(s):  
Lactic Acid ◽  
Reactive Extrusion ◽  
Poly Lactic Acid ◽  
Dicumyl Peroxide ◽  
Butylene Succinate

Reactive extrusion of nanocomposites based on ethylene copolimers and mineral fillers

2021 ◽  
Vol 1 ◽  
pp. 58-66
Author(s):  
N. T. Kakhramanov ◽  
◽  
I. V. Bayramova ◽  
A. J. Guliev ◽  
◽  
...  
Keyword(s):  
Temperature Regime ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
Structural Features ◽  
Ultimate Tensile Stress ◽  
Extrusion Temperature ◽  
Dicumyl Peroxide ◽  
Physicomechanical Characteristics ◽  
Natural Minerals ◽  
Mineral Fillers

The paper presents the results of a study of the influence of the temperature regime of reaction extrusion on the main physicomechanical characteristics of nanocomposites based on copolymers of ethylene with butylene and ethylene with hexene and natural minerals - clinoptilolite and vesuvian. The optimal temperature regime of extrusion of nanocomposites based on copolymers of ethylene and natural minerals was established. At a maximum extrusion temperature of 230 °C in the dosing zone, counterflow increases, which contributes to an increase in the residence time of the nanocomposite melt and, accordingly, to a decrease in extruder productivity. The possibility of mechanochemical synthesis of nanocomposites vulcanized with dicumyl peroxide on an extruder using monotreme technology has been proved. It was found that as a result of vulcanization of nanocomposites based on ethylene copolymers, a significant increase in the ultimate tensile stress and a decrease in the elongation at break are observed. With an increase in the maximum extrusion temperature in the extruder head to 230 °C, it does not lead to the appearance of a counterflow. At the same time, it was shown that with an increase in the temperature regime of extrusion of vulcanized nanocomposites over 200 °C, the time spent by the melt in the material cylinder practically does not undergo changes. A fundamental feature of the effect of chemical crosslinking with dicumyl peroxide on the processing process and the regularity of changes in the properties of nanocomposites are established. The probable mechanism of the vulcanization process in the melt of the polymer matrix and its selective effect on the reaction extrusion process, structural features and properties of nanocomposites are presented.

Research on Maleic Anhydride Improving the Interfacial Compatibility of PLLA and OMMT by Grafting Method

2012 ◽  
Vol 262 ◽  
pp. 567-571 ◽  
Author(s):  
Rui Xia Duan ◽  
Kai Guo ◽  
Ying Ning He ◽  
Jin Zhou Chen ◽  
Ming Jun Niu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Polylactic Acid ◽  
Material Properties ◽  
Reactive Extrusion ◽  
Dicumyl Peroxide ◽  
Melt Flow ◽  
Melt Flow Rate ◽  
Modified Montmorillonite ◽  
Interfacial Compatibility

Polylactic acid as a biodegradable polymer shows relative high rigidity, but it is brittle and has poor heat resistance, which greatly limits its application. The goal of this experiment is to prepare polylactic acid/organic modified montmorillonite nanocomposite by melting, and to enhance the material properties by improving the interfacial compatibility. First PLLA-g-MAH is prepared through reactive extrusion under initiator dicumyl peroxide, then PLLA /PLLA-g-MAH/OMMT nanocomposite is prepared by melt extrusion. Grafted rate was determined by infrared spectroscopy and chemical titration, and it get to peak when the content of maleic anhydride is 2 wt %. Melt flow rate indicates the nanocomposite has better melt flow and better workability than pure PLA. Mechanical properties of the nanocomposite are best when the content of grafting is 3 wt %. DSC shows that melting temperature and crystallinity of PLLA first increase and then decrease along with the increase of the PLLA-g-MAH, and both of them come to the top when PLLA-g-MAH is 3 wt %.

Preparation and Properties of Polypropylene-Graft-Cardanol by Reactive Extrusion

2014 ◽  
Vol 936 ◽  
pp. 39-42
Author(s):  
Qin Hui Chen ◽  
Jin Huo Lin
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Reactive Extrusion ◽  
Cross Linking ◽  
Dicumyl Peroxide ◽  
Elongation At Break ◽  
Chemical Inertness ◽  
Bamboo Powder ◽  
Aging Performance

The polypropylene-graft-cardanol (CAPP) was prepared by reactive extrusion with polypropylene (PP) and natural renewable cardanol which could improve the inherent defects of PP such as chemical inertness and hydrophobicity. Moreover, the cardanol grafted onto PP could resolve the degradation of PP during the process of reactive extrusion. In this paper, CAPP was prepared in the presence of three different kinds initiator. The compatibilization and the anti-aging performance of cardanol grafted onto PP were studied. Results showed that the initiator dicumyl peroxide (DCP) exhibited the optimum initiated efficiency. Cardanol grafted onto PP was benificial for the composite of bamboo powder and PP.The initiator of DCP caused the degradation of PP chains during the aging processing. After aged for 24 h, the yield strength decreased from 28 MPa to 15 MPa and the elongation at break reduced by 795 %. The CAPP possessed outstanding anti-aging performance owing to the cross-linking and entanglement of the side chains of cardanol grafted onto PP. The yield strength, tensile strength and the elongation at break of CAPP-DCP changed lightly even when it was in long-term irradiation for 480 h.

Discoloration of green PET bottles recycled with chemical agents by reactive extrusion

2021 ◽  
pp. 009524432110153
Author(s):  
Javier Guillén-Mallette ◽  
Carlos Rolando Ríos-Soberanis ◽  
Jazmín Enríquez-Reyes
Keyword(s):  
Intrinsic Viscosity ◽  
Copper Phthalocyanine ◽  
Color Change ◽  
Hydrolytic Degradation ◽  
Reactive Extrusion ◽  
Chemical Agent ◽  
Dicumyl Peroxide ◽  
Oxidizing Agent ◽  
Pet Bottles ◽  
Chemical Agents

This study evaluates the effect of incorporating chemical agents with green polyethylene terephthalate (PET) bottles on extrudate color change and other properties. First, the best type of chemical agent that decolorizes recycled green PET bottles (RGPB) with good processability was determined. RGPB-chemical agent mixtures were evaluated, reducing, photoinitiator, or oxidant, where the best one turned out to be the oxidizing agent, a dicumyl peroxide. Then new mixtures of RGPB-oxidizing agent, dicumyl or benzoyl, were made in a reactive extrusion process employing a drying hopper to avoid hydrolytic degradation. The intrinsic viscosity, crystallinity, and color change of extrudates were determined. It was determined by SEM with EDS that the dye is possibly a chlorinated copper phthalocyanine. The final results show an increase in the intrinsic viscosity of the PET handling dicumyl peroxide, a partial whitening of the extrudates, and an increase in the crystallinity of the PET, which contributed to a decrease the hue and saturation of the green color of RGPB. Where the dicumyl peroxide present in mixtures with RGPB interacts with chlorinated copper phthalocyanine to produce phthalamide or phthalic acid, which are white.

scholarly journals Effect of Co-monomer Styrene on Reactive Compatibilization of PE/Wood-flour Composites

2018 ◽  
Vol 142 ◽  
pp. 01011
Author(s):  
Yuewen Li ◽  
Xinhua Chen
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Wood Flour ◽  
Reactive Extrusion ◽  
Dicumyl Peroxide ◽  
Reactive Compatibilization ◽  
Heat Distortion Temperature ◽  
Initial Stage ◽  
Anchoring Strength ◽  
Scanning Electron

Compatibilization between polyethylene(PE) and wood-flour was achieved by means of direct reactive extrusion of PE, wood-flour, maleic anhydride(MAH), co-monomer styrene(St) and dicumyl peroxide. Mechanical properties and heat distortion temperature(HDT) of the PE/wood-flour composites were tested, and impact cracking surfaces of the composites were observed via scanning electron microscope. Effect of St on reactive compatibilization of the composites was evaluated. Experimental results indicated that the anchoring strength of interface in the composites was obviously strengthened after St was added. Mechanical properties and HDT of the composites raised with increase of use level of St on the initial stage, and then gradually descended. When use level of St ran up to 1.5%, mechanical properties and HDT of the composites were best. At this moment, the mole ratio of St and MAH was approximately 1:1.

scholarly journals Improvement of the compatibility between poly(3-hydroxybutyrate) and poly(ε-caprolactone) by reactive extrusion with dicumyl peroxide

2017 ◽  
Vol 86 ◽  
pp. 41-57 ◽  
Author(s):  
D. Garcia-Garcia ◽  
E. Rayón ◽  
A. Carbonell-Verdu ◽  
J. Lopez-Martinez ◽  
R. Balart
Keyword(s):  
Reactive Extrusion ◽  
Dicumyl Peroxide
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