Co-Continuous PPS/PA66 Composites - Part I: Phase Morphology and Structure

2013 ◽  
Vol 804 ◽  
pp. 98-101
Author(s):  
Tao Yin ◽  
Yu Qi Gu ◽  
Jie Hua Gao ◽  
Wen Yue Yu
Keyword(s):  
Electron Microscopy ◽  
Continuous Phase ◽  
Phase Morphology ◽  
Dispersed Phase ◽  
Polyamide 66 ◽  
Screw Extruder ◽  
Wide Range ◽  
Morphology And Structure ◽  
Twin Screw ◽  
Scanning Electron

Poly (phenylene sulfide) (PPS) was blended with polyamide 66 (PA66) in a wide range of compositions by using a co-rotating twin-screw extruder. Scanning electron microscopy and solvent extraction were employed to detect phase morphology of PPS/PA66 composites. The results demonstrated that the phase morphology of PPS/PA66 composites changed from PA66 dispersed phase in PPS matrix to co-continuous phase, and then PPS dispersed phase in PA66 matrix with the increase of PA66 content.

The impact properties of a polyamide 6– polytetrafluoroethylene composite

2009 ◽  
Vol 224 (1) ◽  
pp. 13-17 ◽  
Author(s):  
J Li ◽  
Y F Zhang
Keyword(s):  
Electron Microscope ◽  
Interfacial Adhesion ◽  
Polyamide 6 ◽  
Continuous Phase ◽  
Dispersed Phase ◽  
Screw Extruder ◽  
Impact Properties ◽  
Twin Screw ◽  
The Impact ◽  
Scanning Electron

Polyamide 6 (PA6)-filled polytetrafluoroethylene (PTFE) at different compositions has been successfully prepared in a corotating twin screw extruder where PTFE acts as the polymer matrix and PA6 as the dispersed phase. The morphology and impact properties of these blends were investigated using a scanning electron microscope. The presence of PA6 particles dispersed in the PTFE continuous phase exhibited a coarse morphology. Increasing PA6 contents in the blend improved the impact properties at weak deformation. It was found that the interfacial adhesion played an important role in the creation of an interphase that was formed by the interaction between the PTFE and PA6. This induced an improvement in impact properties. In addition, the optimum impact properties were obtained when the content of PA6 is 30 vol%.

Co-Continuous PPS/PA66 Composites - Part II: Mechanical Performance

2013 ◽  
Vol 804 ◽  
pp. 102-105
Author(s):  
Tao Yin ◽  
Yu Qi Gu ◽  
Chun Yu Yu ◽  
Zi Xin Li
Keyword(s):  
Mechanical Properties ◽  
Phase Structure ◽  
Mechanical Performance ◽  
Mechanical Analysis ◽  
Continuous Phase ◽  
Polyamide 66 ◽  
Screw Extruder ◽  
Wide Range ◽  
Twin Screw

Poly (phenylene sulfide) (PPS) was blended with polyamide 66 (PA66) in a wide range of compositions by using a co-rotating twin-screw extruder. Dynamic mechanical analysis was used in determination of the co-continuous phase. The results allowed to precisely detecting the range of co-continuity. In addition, the mechanical properties of PPS/PA66 composites can also be used to identify the dispersed/matrix phase or co-continuous phase structure.

INNOVATIVE MANUFACTURING OF CARBON NANOTUBE-LOADED FIBRILLAR POLYMER COMPOSITES

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2459-2465 ◽  
Author(s):  
R. J. T. LIN ◽  
D. BHATTACHARYYA ◽  
S. FAKIROV
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polymer Composites ◽  
Polyamide 66 ◽  
Screw Extruder ◽  
Enhancing Effect ◽  
The Matrix ◽  
Twin Screw ◽  
New Type ◽  
Scanning Electron

The concept of microfibrillar composite (MFC) has been used to create a new type of polymer composites, in which the reinforcing microfibrils are loaded with carbon nanotubes (CNT). Polyamide 66 (PA66) has been melt blended with polypropylene in a twin screw extruder with and without CNT, and thereafter cold drawn to create a fibrillar state as well as to align the CNT in the PA66 microfibrils. The drawn bristles were compression moulded at 180°C to prepare MFC plates. The scanning electron microscope (SEM) observations indicate near perfect distribution of CNT in the reinforcing PA66 microfibrils. Although the fibrillated PA66 is able to improve the tensile stiffness and strength as expected from the MFC structure, the incorporation of CNT does not exhibit any further enhancing effect. It rather adversely affects the mechanical properties due to poor interface adhesion between the matrix and the reinforcing microfibrils with the presence of CNT, as demonstrated by SEM. However, the resulting highly aligned CNT within the MFC are expected to affect the physical and functional properties of these composites.

Preparation and Volume Resistivity of CNT/Polycarbonate Nanocomposites with Different Injection Molding Temperatures

2014 ◽  
Vol 543-547 ◽  
pp. 3878-3881 ◽  
Author(s):  
Jian Hui Qiu ◽  
Li Min Zang ◽  
Kengo Uchiya ◽  
Sakai Eiichi ◽  
Li Jun Wang
Keyword(s):  
Electron Microscopy ◽  
Injection Molding ◽  
Volume Resistivity ◽  
Strong Impact ◽  
Screw Extruder ◽  
Step Method ◽  
Molding Temperature ◽  
Twin Screw ◽  
Different Temperatures ◽  
Scanning Electron

In this work, carbon nanotube/polycarbonate (CNT/PC) nanocomposites containing 1wt% CNT were prepared by a two-step method of twin-screw extruder mixing followed by injection molding at different temperatures. The microstructure, which has strong impact on the electrical properties of the composite, was affected by the injection molding conditions. This work is focused on the effect of injection molding temperature on the volume resistivity of CNT/PC nanocomposites. The microstructure of the composites was investigated by scanning electron microscopy (SEM). It was found that the volume resistivity of CNT/PC nanocomposites was decreased from 1013 to 105 Ω·cm with the increasing injection molding temperature.

scholarly journals Influence of Processing Type in the Morphology of Membranes Obtained from PA6/MMT Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Rodholfo da Silva Barbosa Ferreira ◽  
Caio Henrique do Ó Pereira ◽  
Rene Anisio da Paz ◽  
Amanda Melissa Damião Leite ◽  
Edcleide Maria Araújo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
X Ray ◽  
Membrane Morphology ◽  
Twin Screw ◽  
Microscopy Images ◽  
Scanning Electron

The nanocomposites have an extensive use in the current process of membrane preparation, taking into account their unique features as membranes. Thus, the study of nanocomposite processing to obtain membranes is highly important. In this work, Brazilian clay was used (Brasgel PA) for the preparation of polyamide/clay nanocomposite. The nanocomposites were produced in a high rotation homogenizer and in a twin screw extruder. From the nanocomposites and pure polymers processed in the two equipments, membranes were prepared by the immersion-precipitation method, using formic acid as solvent. By X-ray diffraction (XRD), the formation of exfoliated and/or partially exfoliated structures with changes in the crystalline phases of the polyamide was observed. From scanning electron microscopy images, it was observed that the processing clearly influenced the membrane morphology.

Step-Scan DSC Study on the Melting Behavior of Polypropylene/Attapulgite Nanocomposites

2011 ◽  
Vol 284-286 ◽  
pp. 763-768
Author(s):  
Li Li Sun ◽  
Kun Hu ◽  
Lin Chen ◽  
Kang Zheng ◽  
Xing You Tian
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Melting Behavior ◽  
Secondary Crystallization ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Twin Screw ◽  
Multiple Melting ◽  
Scanning Electron

Attapulgite(AT) was modified by grafting with butyl acrylate(BA) via polymerizations initiated by Gamma radiation. The polypropylene(PP)/AT nanocomposites were synthesized via melting extrude in a twin-screw extruder. The thermogravimetry(TG) and scanning electron microscopy (SEM) were used to assess the graft ratio of the hybrid materials and the dispersion of AT, respectively. Step-scan differential scanning calorimetry(SSDSC) was used to study the influence of AT on the crystallization and subsequent melting behavior. The results indicated that PP and PP/AT nanocomposites underwent multiple melting and secondary crystallization processes during heating. The melting behaviours of PP and PP/AT nanocomposites varied with the variation of crystallization temperature and AT content.

The Morphology during Extrusion of PA6/PP Blends in the Presence of Nanoclays

2010 ◽  
Vol 636-637 ◽  
pp. 840-845 ◽  
Author(s):  
Maria Ferreira Almeida ◽  
Ana Vera Machado ◽  
José A. Covas
Keyword(s):  
Electron Microscopy ◽  
Dispersed Phase ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
X Ray ◽  
Transmission Electron ◽  
Twin Screw ◽  
Oscillatory Rheology ◽  
Pp Blends ◽  
Alkyl Ammonium

The present study investigates the morphology of polyamide (PA6) and polypropylene (PP) blends in the presence of an organoclay during extrusion. Physical PA6 /PP blends and blends of PA6/PP and PP modified with maleic anhydride, both filled with a montmorillonite (MMT) modified alkyl ammonium organoclay, were prepared in a modular co-rotating twin screw extruder. Samples were collected along the extruder and analyzed by X-ray diffraction (XRD), oscillatory rheology, and scanning and transmission electron microscopy (SEM and TEM, respectively). Intercalation and some degree of clay exfoliation seem to have been achieved. Generally, the presence of the organoclay yields a finer dispersed phase along the extruder.

Effect of screw configuration on the dispersion of nanofillers in thermoset polymers

2017 ◽  
Vol 37 (8) ◽  
pp. 815-825 ◽  
Author(s):  
Gangadhar Angadi ◽  
Hebbale NarayanaRao Narasimha Murthy ◽  
Sridhar Ramakrishna ◽  
Salim Firdosh ◽  
Raghavendra Nagappa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
X Ray ◽  
Right Hand ◽  
Uniform Dispersion ◽  
Twin Screw ◽  
Thermoset Polymers ◽  
Scanning Electron ◽  
Better Than

Abstract This paper deals with the study of screw configuration for dispersing nanofillers in thermoset polymers using an intermesh co-rotating twin screw extruder. The influence of kneading elements on the dispersion of nanoclay in epoxy was examined using 10 different screw configurations. Nanoclay was dispersed in epoxy at a barrel temperature of 5°C and a screw speed of 100 rpm. The combination of right hand kneading block and three/four lobed kneading blocks resulted in uniform dispersion of nanofiller. Positive staggered angle with right hand kneading elements yielded uniform dispersion of the nanofiller. Mechanical properties of epoxy nanocomposites processed with these configurations were better than those of neat epoxy. Excessive shear was associated with four lobed kneading block (4KB)/4KB configuration and hence degradation of polymers leading to shorter chains, whereas inadequate shearing in neutral kneading block (NKB)/NKB configuration led to agglomerations. These observations were evidenced by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

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