Preparation and characterization of modified and functional starch (hexadecyl corboxymethyl starch) ether using reactive extrusion

2016 ◽  
Vol 69 (5-6) ◽  
pp. 1600061 ◽  
Author(s):  
MengXi Xie ◽  
YuMin Duan ◽  
FanShu Li ◽  
Xia Wang ◽  
XiaoTong Cui ◽  
...  
Keyword(s):  
Reactive Extrusion ◽  
Functional Starch

scholarly journals Development and Characterization of Sustainable Composites from Bacterial Polyester Poly(3-Hydroxybutyrate-co-3-hydroxyhexanoate) and Almond Shell Flour by Reactive Extrusion with Oligomers of Lactic Acid

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1097 ◽  
Author(s):  
Juan Ivorra-Martinez ◽  
Jose Manuel-Mañogil ◽  
Teodomiro Boronat ◽  
Lourdes Sanchez-Nacher ◽  
Rafael Balart ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Mechanical Characterization ◽  
Linear Thermal Expansion ◽  
Reactive Extrusion ◽  
Thermomechanical Analysis ◽  
Almond Shell ◽  
Scanning Calorimetry ◽  
Filler Reinforcement ◽  
Lignocellulosic Filler

Eco-efficient Wood Plastic Composites (WPCs) have been obtained using poly(hydroxybutyrate-co-hexanoate) (PHBH) as the polymer matrix, and almond shell flour (ASF), a by-product from the agro-food industry, as filler/reinforcement. These WPCs were prepared with different amounts of lignocellulosic fillers (wt %), namely 10, 20 and 30. The mechanical characterization of these WPCs showed an important increase in their stiffness with increasing the wt % ASF content. In addition, lower tensile strength and impact strength were obtained. The field emission scanning electron microscopy (FESEM) study revealed the lack of continuity and poor adhesion among the PHBH-ASF interface. Even with the only addition of 10 wt % ASF, these green composites become highly brittle. Nevertheless, for real applications, the WPC with 30 wt % ASF is the most attracting material since it contributes to lowering the overall cost of the WPC and can be manufactured by injection moulding, but its properties are really compromised due to the lack of compatibility between the hydrophobic PHBH matrix and the hydrophilic lignocellulosic filler. To minimize this phenomenon, 10 and 20 phr (weight parts of OLA-Oligomeric Lactic Acid per one hundred weight parts of PHBH) were added to PHBH/ASF (30 wt % ASF) composites. Differential scanning calorimetry (DSC) suggested poor plasticization effect of OLA on PHBH-ASF composites. Nevertheless, the most important property OLA can provide to PHBH/ASF composites is somewhat compatibilization since some mechanical ductile properties are improved with OLA addition. The study by thermomechanical analysis (TMA), confirmed the increase of the coefficient of linear thermal expansion (CLTE) with increasing OLA content. The dynamic mechanical characterization (DTMA), revealed higher storage modulus, E’, with increasing ASF. Moreover, DTMA results confirmed poor plasticization of OLA on PHBH-ASF (30 wt % ASF) composites, but interesting compatibilization effects.

Preparation and characterization of thermoplastic starch/PLA blends by one-step reactive extrusion

2007 ◽  
Vol 56 (11) ◽  
pp. 1440-1447 ◽  
Author(s):  
Ning Wang ◽  
Jiugao Yu ◽  
Xiaofei Ma
Keyword(s):  
Reactive Extrusion ◽  
Thermoplastic Starch ◽  
One Step

Preparation and Characterization of Poly(Lactic Acid)/Ethylene Glycidyl Methacrylate Copolymer Blends

2010 ◽  
Vol 150-151 ◽  
pp. 139-143
Author(s):  
Chi Hui Tsou ◽  
Ya Ming Li ◽  
Wei Hua Yao ◽  
Jen Taut Yeh
Keyword(s):  
Reactive Extrusion ◽  
Poly Lactic Acid ◽  
Shear Rates ◽  
Copolymer Blends ◽  
Blown Film ◽  
Ft Ir ◽  
Ir Analysis ◽  
Methacrylate Copolymer ◽  
Epoxy Groups

Both tensile and tear strength values of PLAxEGMCy blown-film specimens in machine and transverse directions improve significantly and reach the maximum values as their EGMC contents approach an optimum value of 6 wt%. The melt shear viscosity values of PLAxEGMCy resins measured at varying shear rates are significantly higher than those of the PLA resin and increase consistently with their EGMC contents. FT-IR analysis suggest that the carboxylic acid groups of PLA molecules react with the epoxy groups of EGMC molecules during the reactive-extrusion processes of PLAxEGMCy specimens. Further DMA and morphological analysis of PLAxEGMCy specimens reveal that EGMC molecules are phase-separated with PLA molecules at EGMC contents equal to or more than 2 wt%, since distinguished phase-separated EGMC droplets and tanδ transitions were found on fracture surfaces and tanδ curves of PLAxEGMCy specimens, respectively. Possible reasons accounting for the above interesting properties of the PLA/EGMC specimens are proposed in this study.

scholarly journals Transformation of polyethylene into a vitrimer by nitroxide radical coupling of a bis-dioxaborolane

2019 ◽  
Vol 10 (23) ◽  
pp. 3107-3115 ◽  
Author(s):  
Florent Caffy ◽  
Renaud Nicolaÿ
Keyword(s):  
Nitroxide Radical ◽  
Reactive Extrusion ◽  
Synthesis And Characterization ◽  
Radical Coupling

This work reports the synthesis and characterization of HDPE vitrimers obtained via reactive extrusion in the presence of bis-nitroxide dioxaborolanes.

Rheological characterization of starch derivatives/polycaprolactone blends processed by reactive extrusion

2008 ◽  
Vol 48 (9) ◽  
pp. 1862-1870 ◽  
Author(s):  
Frédéric Bossard ◽  
Isabelle Pillin ◽  
Thierry Aubry ◽  
Yves Grohens
Keyword(s):  
Reactive Extrusion ◽  
Rheological Characterization ◽  
Starch Derivatives
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