Interfacial interaction of clay with binary blends of polyamide 6 with High-Density Polyethylene (HDPE) and HDPE-graft-acrylic acid studied by Positron Annihilation Lifetime Spectroscopy

2010 ◽  
Vol 37 (3/4) ◽  
pp. 358
Author(s):  
Yan Zhu ◽  
Zhengping Fang ◽  
Yuzhen Xu ◽  
Lifang Tong
Keyword(s):  
Acrylic Acid ◽  
Positron Annihilation ◽  
High Density Polyethylene ◽  
Polyamide 6 ◽  
Interfacial Interaction ◽  
High Density ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Binary Blends ◽  
Positron Annihilation Lifetime

The Influence of Acrylic Acid Groups on the Microstructure of HDPE/PS/Clay System Studied by Positron Annihilation

2008 ◽  
Vol 607 ◽  
pp. 88-90
Author(s):  
Hong Mei Wang ◽  
Zhe Chen ◽  
Peng Fei Wang ◽  
Shao Jie Wang
Keyword(s):  
Acrylic Acid ◽  
Positron Annihilation ◽  
High Density Polyethylene ◽  
High Density ◽  
X Ray Diffraction ◽  
Positron Annihilation Lifetime ◽  
Immiscible Blends ◽  
Melt Compounding ◽  
Clay System ◽  
Better Than

Two types of composites－high density polyethylene/polystyrene (HDPE/PS) with clay, and high density polyethylene grafted with acrylic acid/PS (PEAA/PS) with clay－were prepared via melt compounding. X-ray diffraction (XRD) results revealed that the dispersion of clay in compatibilized blends was better than immiscible blends. Positron annihilation lifetime spectroscopy (PALS) has been utilized to investigate the microstructure of two types of composites. The ortho-positronium (o-Ps) intensity for PEAA/PS was lower than that for HDPE/PS. The results provided evidence that the chain segments with carboxyl group would be easier to intercalate the gallery of silicates.

scholarly journals Study of multiblock polyamide-6/Poly-(isoprene) copolymers by positron annihilation spectroscopy

2008 ◽  
Vol 6 (4) ◽  
pp. 575-580 ◽  
Author(s):  
R. Bryaskova ◽  
R. Mateva ◽  
N. Djourelov ◽  
M. Krasteva
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Main Chain ◽  
Positron Annihilation Spectroscopy ◽  
Polyamide 6 ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Degree Of Crystallinity ◽  
Doppler Broadening ◽  
Annihilation Line ◽  
Positron Annihilation Lifetime

AbstractPositron annihilation lifetime spectroscopy (PALS) has been used to determine the free volume in multiblock polyamide-6/poly-(isoprene) copolymers (PA-6/PI), synthesized via activated anionic bulk copolymerization. The diisocyanate functionalized telechelic PI, blocked with caprolactam (CL) has been used as a commoner and an activator at the same time. The elastic PI block incorporated into the main chain of PA-6 affects the amorphous and crystal phase of the copolymer leading to changing in degree of crystallinity. The positron annihilation lifetime spectroscopy (PAL) and Doppler broadening of annihilation line (DBAL) technique in a set of pure PA-6 and PA-6/PI copolymers with two different compositions have been applied and evaluation of the size of free-volume holes (pores), localized mainly in the disordered regions of the PA-6/PI copolymer by measuring the o-Ps lifetime (τ3) and o-Ps intensity (I3) has been performed.

scholarly journals Relationship between the Microstructure and Performance of Graphene/Polyethylene Composites Investigated by Positron Annihilation Lifetime Spectroscopy

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2990
Author(s):  
Xiaobing Han ◽  
Tao Chen ◽  
Yuan Zhao ◽  
Jie Gao ◽  
Yanan Sang ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Volume Fraction ◽  
Quantitative Description ◽  
Interfacial Interaction ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Structure Property ◽  
Positron Annihilation Lifetime ◽  
Free Volume Fraction ◽  
Interaction Intensity

The quantitative characterization of microstructure is most desirable for the establishment of structure-property relationships in polymer nanocomposites. In this work, the effects of graphene on the microstructure, mechanical, electrical, and thermal properties of the obtained graphene/polyethylene (PE) composites were investigated. In order to reveal the structure-performance relationship of graphene/PE composites, especially for the effects of the relative free volume fraction (fr) and interfacial interaction intensity (β), positron annihilation lifetime spectroscopy (PALS) was employed for its quantitative description. The relative free volume fraction fr gives a good explanation of the variation for surface resistivity, melting temperature, and thermal stability, and the variation of tensile strength and thermal conductivity agree well with the results of interfacial interaction intensity β. The results showed that fr and β have a significant effect on the properties of the obtained graphene/PE composites, and the effect on the properties was revealed.

Positron Irradiation Effects in HDPE during PAL Measurement at Ambient Temperature

2012 ◽  
Vol 733 ◽  
pp. 143-146
Author(s):  
Jerzy Kansy ◽  
Magdalena Ziąbka
Keyword(s):  
Ambient Temperature ◽  
Positron Annihilation ◽  
High Density Polyethylene ◽  
High Density ◽  
Irradiation Effect ◽  
Irradiation Effects ◽  
Good Relationship ◽  
Positron Annihilation Lifetime ◽  
Positron Trapping

The positron irradiation effect in high density polyethylene at ambient temperature is studied by positron annihilation lifetime method. The positron spectra are analyzed with a model which takes into account positron trapping and so called delayed formation of positronium (DFP). A good relationship is noticed between the rate of positron trapping and the rate of DFP.

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