Effect of stretching speed on morphologies and properties of in situ microfibrillar POE/PLA composites

2020 ◽  
pp. 089270572093917
Author(s):  
Jing Sun ◽  
Anrong Huang ◽  
Shanshan Luo ◽  
Min Shi ◽  
Heng Luo ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Rheological Properties ◽  
Loss Modulus ◽  
Weight Ratio ◽  
Poly Lactic Acid ◽  
Electron Microscopic ◽  
Dynamic Rheological Properties ◽  
Scanning Electron Microscopic ◽  
Ethylene Octene Copolymer

In situ microfibrillar ethylene–octene copolymer (POE)/poly(lactic acid) (PLA) composites (MFCs) with different phase morphologies were prepared by controlling the stretching speed and maintaining the weight ratio of POE/PLA of 80/20. Four different stretching speeds were employed to study the effect of PLA microfibrillar morphology on tensile, crystalline, and rheological properties of MFCs. Scanning electron microscopic images revealed that the morphology of PLA phase was strongly influenced by stretching speed. MFCs with highest aspect ratio and smaller diameter of PLA microfibrils were obtained with a stretching speed of 60 rpm. The PLA microfibrils with high aspect ratio had the best reinforcement effect on MFCs. The dynamic rheological properties indicated that the MFCs achieved higher storage modulus and loss modulus at the stretching speed of 60 rpm.

Mechanical Alloying of Fe-Nb-N with Different Ball to Powder Weight Ratio for the Formation of Fe-NbC Composite

2012 ◽  
Vol 620 ◽  
pp. 94-98 ◽  
Author(s):  
Siti Zalifah Md Rasib ◽  
Zuhailawati Hussain
Keyword(s):  
Mechanical Alloying ◽  
Weight Ratio ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Microstructure Characteristics ◽  
Scanning Electron Microscopic ◽  
Small Crystallite

Milling process through mechanical alloying method was performed on a powder mixture of Fe-80.11 wt%, Nb-17.62 wt% and C-2.26 wt% to produce Fe-NbC composite by in situ reaction. Ball to powder weight ratio parameter was selected since formation of phase and microstructure characteristics of this composite were expected to depend on ball collision event during milling. The as-milled and sintered Fe-NbC was characterized by X-ray diffraction (XRD) and Scanning Electron Microscopic (SEM). We found that formation of Fe-NbC by in situ required mechanical alloying of the mixture using 10:1 of ball to powder weight ratio to achieve small crystallite size and more homogeneous of NbC phase.

Mechanical Study and Microscopic Characterization of Lignin/PE Composites

2011 ◽  
Vol 335-336 ◽  
pp. 191-194 ◽  
Author(s):  
Xin Ying Lv ◽  
Zhen Hua Gao ◽  
Yan Hua Zhang ◽  
Ming Wei Di
Keyword(s):  
Tensile Properties ◽  
Weight Ratio ◽  
Mechanical Tests ◽  
Electron Microscopic ◽  
Mechanical Study ◽  
Scanning Electron Microscopic ◽  
Compatibilizing Agent ◽  
Scanning Electron

The lignin/PE composites with different compatibilizing agents were extruded and the tensile properties have been tested. The weight ratio of PE, ligin and PE-a-MAH were 7.5%, 10%and 12.5wt%; the weight ratio of PE, ligin and PP-a-MAH were 5%, 7.5% and 10wt% respectively. Scanning Electron Microscopic (SEM) was used to characterize the morphology of the composites. The tensile strengths of lignin/PE composites with PE-g-MAH were higher than that one with PP-g-MAH. Both of them were higher than that one without any compatibilizing agent. And PE-g-MAH was the better compatibilizing agent confirmed by the mechanical tests and SEM results.

Effects of Concentration and Temperature on Rheological Properties of Mixture of HPMC and CMC Solutions

2013 ◽  
Vol 787 ◽  
pp. 792-797
Author(s):  
Qing Yong Li ◽  
Jun Ye ◽  
Jian Xiong
Keyword(s):  
Rheological Properties ◽  
Arrhenius Equation ◽  
Loss Modulus ◽  
Flow Activation Energy ◽  
Shear Rates ◽  
Shear Thinning Fluids ◽  
Dynamic Rheological Properties ◽  
Flow Activation ◽  
Dominant Property ◽  
Power Law Equation

This work was designed to study the rheologicl properties of mixture of HPMC and CMC solutions because their rheologicl properties are very important in no matter food or pharmaceutical industry processing operations. Experiments were performed at different mixture ratios, shear rates and temperatures. The static and dynamic rheological properties tests were measured through the rheometer AR-550 and were investigated by using Power Law equation, Cross equation and Arrhenius equation. The results showed that the HPMC-CMC solutions behaved as typical Non-Newtonian shear-thinning fluids and had stronger non-Newtonian nature. With the concentration(CMC)increasing, consistency coefficient K, Zero Shearing Viscosity η0,viscous flow activation energy E, storage modulus G and loss modulus G all increased but decreased with the temperature increasing, except for Non-Newtonian index n. And viscosity was the dominant property in the mixture of HPMC-CMC solutions.

Preparation and Characterization of Palygorskite/PAM Composited Thickener

2015 ◽  
Vol 719-720 ◽  
pp. 73-76
Author(s):  
Jia Lu ◽  
Jia Jia Wang ◽  
Xiao Xiao Tian ◽  
Ye Ling Jin ◽  
Jing Chen ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Sodium Hydroxide ◽  
Rheological Properties ◽  
In Situ Polymerization ◽  
Dynamic Rheological Properties ◽  
Electrolyte Resistance

Palygorskite/polyacrylamide (PAM) composited thickeners were prepared via in-situ polymerization. To optimize the preparation, the dependence of the viscosity, rheological properties and electrolyte resistance of the composited thickeners on the initiator concentrations, sodium hydroxide concentrations and palygorskite contents was investigated. By measuring their dynamic rheological properties, thickening mechanism of composited thickeners was explored. The composited thickeners showed excellent electrolyte resistance which represented good synergistic effect of inorganic/organic composited thickener.

scholarly journals Scanning electron microscopic study of the in situ effect of salivary stimulation on erosion and abrasion in human and bovine enamel

2008 ◽  
Vol 22 (2) ◽  
pp. 132-138 ◽  
Author(s):  
Daniela Rios ◽  
Heitor Marques Honório ◽  
Ana Carolina Magalhães ◽  
Salete Moura Bonifácio da Silva ◽  
Alberto Carlos Botazzo Delbem ◽  
...  
Keyword(s):  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Bovine Enamel ◽  
Scanning Electron
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