The effect of gamma irradiation on the structure and properties of ester-ether elastomers

Gamma irradiation crosslinking of nylon6 fibers with and without the presence of triallyl cyanurate(TAC) was studied, XRD、DSC、IR and TG were used to analyze the effects of irradiation crosslinking on structure and properties of PA6 fibers. The melt-drip performance of PA6 fibers was improved after irradiation crosslinking. The breaking strength increased first then decreased as a function of absorbed dose, while elongation at break decreased. The melting temperature and crystallinity decreased with increasing the dose. Besides, the onset temperature of degradation fell slightly and the amount of non-volatile residue at 600oC increased as the irradiation dosage increased.

Download Full-text

Study of the effect of gamma irradiation on the structure and properties of metallocene linear low density polyethylene containing hindered amines

Polymer Bulletin ◽

10.1007/s00289-007-0850-1 ◽

2007 ◽

Vol 60 (2-3) ◽

pp. 387-395 ◽

Cited By ~ 6

Author(s):

Mustapha Kaci ◽

Hocine Djidjelli ◽

Tahar Boukedami

Keyword(s):

Gamma Irradiation ◽

Low Density Polyethylene ◽

Low Density ◽

Structure And Properties ◽

Linear Low Density Polyethylene ◽

Hindered Amines

Download Full-text

Modification of Structure and Properties of Superconducting YBaCuO Crystals by Combined Irradiations

MRS Proceedings ◽

10.1557/proc-659-ii7.8 ◽

2000 ◽

Vol 659 ◽

Author(s):

Elvira M. Ibragimova ◽

Marquis A. Kirk

Keyword(s):

Magnetic Properties ◽

Gamma Irradiation ◽

Flux Pinning ◽

Critical Parameter ◽

Structure And Properties ◽

Defect Clusters ◽

Oxygen Defects ◽

Diamagnetic Transition

ABSTRACTEffects of electron irradiations in combination with 60Co gamma-quanta on magnetic properties of YBa2Cu3O7−x crystals have been studied to determine the contribution from oxygen defects to the pinning, and the condition of improving the critical parameter, Jc, of the crystals. Irradiation with 300 keV electrons followed by gamma-irradiation makes strong oxygen disorder, causing degradation of SC-transition and appearance of diamagnetic transition at 200 K, but no flux pinning in H>1 Tesla at 77 K. However, it is shown that oxygen defects do contribute substantially to the flux pinning at cation-anion defect clusters in CuO-planes created by moderate fluences of 1 MeV-electrons. A model is suggested for different oxygen and copper defects induced by the irradiations.

Download Full-text

The effect of gamma irradiation in air and inert atmosphere on structure and properties of unfilled or glass fibre-reinforced polyamide 6

Polymer Bulletin ◽

10.1007/s00289-015-1576-0 ◽

2015 ◽

Vol 73 (6) ◽

pp. 1775-1794 ◽

Cited By ~ 5

Author(s):

Mária Porubská ◽

Dragan Babić ◽

Ivica Janigová ◽

Miroslav Šlouf ◽

Klaudia Jomová ◽

...

Keyword(s):

Gamma Irradiation ◽

Glass Fibre ◽

Polyamide 6 ◽

Inert Atmosphere ◽

Structure And Properties ◽

Glass Fibre Reinforced

Download Full-text

Structure of second phases in TiAl alloys containing Cr and B

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100087197 ◽

1991 ◽

Vol 49 ◽

pp. 576-577

Author(s):

Ernest L. Hall ◽

Shyh-Chin Huang

Keyword(s):

Grain Size ◽

Second Phase ◽

Structure And Properties ◽

Tial Alloys ◽

Second Phases ◽

Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

Download Full-text

Relationships between hierarchical structure and properties in macromolecular systems

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100126950 ◽

1987 ◽

Vol 45 ◽

pp. 440-443

Author(s):

E. Baer

Keyword(s):

Uniaxial Tension ◽

Hierarchical Structure ◽

Inorganic Material ◽

Hierarchical Structures ◽

Bone Collagen ◽

Structure And Properties ◽

Connective Tissues ◽

Scale Level ◽

Fibrous Protein ◽

Macromolecular Systems

The most advanced macromolecular materials are found in plants and animals, and certainly the connective tissues in mammals are amongst the most advanced macromolecular composites known to mankind. The efficient use of collagen, a fibrous protein, in the design of both soft and hard connective tissues is worthy of comment. Very crudely, in bone collagen serves as a highly efficient binder for the inorganic hydroxyappatite which stiffens the structure. The interactions between the organic fiber of collagen and the inorganic material seem to occur at the nano (scale) level of organization. Epitatic crystallization of the inorganic phase on the fibers has been reported to give a highly anisotropic, stress responsive, structure. Soft connective tissues also have sophisticated oriented hierarchical structures. The collagen fibers are “glued” together by a highly hydrated gel-like proteoglycan matrix. One of the simplest structures of this type is tendon which functions primarily in uniaxial tension as a reinforced elastomeric cable between muscle and bone.

Download Full-text

The Structure and Properties of MoSi2 Thin Film in Mos Process

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s1431927600001379 ◽

1980 ◽

Vol 38 ◽

pp. 326-327

Author(s):

C.K. Wu ◽

P. Chang ◽

N. Godinho

Keyword(s):

Thin Film ◽

Integrated Circuits ◽

High Performance ◽

Large Scale ◽

Process Development ◽

Structure And Properties ◽

Metal Silicides ◽

High Oxidation ◽

Important Approach ◽

High Oxidation Resistance

Recently, the use of refractory metal silicides as low resistivity, high temperature and high oxidation resistance gate materials in large scale integrated circuits (LSI) has become an important approach in advanced MOS process development (1). This research is a systematic study on the structure and properties of molybdenum silicide thin film and its applicability to high performance LSI fabrication.

Download Full-text