Results 251 to 260 of about 41,533 (310)

Stabilization of Polypropylene Fibres

Fibre Chemistry, 2001
An optimum method was found for incorporating a polymeric concentrate of the light and thermal stabilizer Chimassorb 944 in the amount of 0.2 %. The method allows fabricating a fibre with satisfactory physicomechanical indexes that retains more than 80% of its strength after UV irradiation for 30 days.
L. I. Kolontai, L. B. Ignat'eva
openaire   +1 more source

Strengthening of polypropylene fibre

Fibre Chemistry, 1971
It has been shown that elongation of polypropylene fibre at a temperature above the melting point of the unoriented polymer is accompanied not only by an increase in structure orientation, but also by formation of a denser structure, which ensures a high fibre strength.
L. A. Polovikhina, M. P. Zverev
openaire   +1 more source

Structure of photooxidized polypropylene fibres

Polymer Science U.S.S.R., 1987
Abstract Photooxidative degradation of polypropylene fibres which differ in the degree of orientation was studied. IR spectroscopy revealed that in the presence of light stabilizers the induction period of oxidation was prolonged and the accumulation of carbonyl groups in the fibre was slowed down.
O. Ďurčová   +3 more
openaire   +1 more source

Characterisation of modified polypropylene fibres

Journal of Materials Science, 2003
Due to excellent mechanical properties, high chemical stability and processability polypropylene fibres are mostly used in different technical fields. However, because of low surface energy, lack of reactive sites and sensitivity to photo or thermal oxidation the polymer properties are insufficient for some applications.
K. Stakne   +4 more
openaire   +1 more source

Interfaces in Alfa Fibre-Polypropylene Matrix Composites

Materials Science Forum, 2008
Model composites with Polypropylene (PP) as matrix and alfa fibres (cellulose-based fibres obtained from the esparto grass of the subsaarian dry regions of Tunisia) were prepared for fibre/matrix interfacial characterization studies. The matrices tested were PP and PP combined with PP modified with maleic anhydride (PP-g-MA).
Paiva, M. C.   +3 more
openaire   +2 more sources

Bonding in polypropylene fibre reinforced concretes

Cement and Concrete Composites, 1989
Abstract The geometry of fibrillated polypropylene fibres after mixing in concrete, and the nature of the fibre interface in the hardened concrete, were characterised by optical and scanning electron microscopy, to resolve the bonding mechanisms in this system.
A. Bentur, S. Mindess, G. Vondran
openaire   +2 more sources

Morphological investigations of polypropylene single-fibre reinforced polypropylene model composites

Polymer, 2001
Melt-spun isotactic polypropylene (iPP) fibres have been prepared with moduli of about 12 GPa and strength of 730 MPa. Single-fibre model composites are prepared by embedding constrained high-modulus iPP fibres in thin films of a matrix material based on the same isotactic polypropylene grade. The morphology of these composites has been investigated by
Loos, J.   +4 more
openaire   +2 more sources

Transcrystallization of polypropylene on carbon fibres

Polymer, 1997
Measurements have been made using a polarized optical microscope equipped with hot stages to investigate the transcrystallization of polypropylene on carbon fibres. Both the nucleation rate and induction time at various crystallization temperatures were measured. It has been found that the induction time is inversely proportional to the nucleation rate.
Chi Wang, C.R Liu
openaire   +1 more source

Bonding of air-formed wood fibre/polypropylene fibre composites

International Journal of Adhesion and Adhesives, 1991
Abstract The effectiveness of a maleated polypropylene (MAPP) as a coupling agent in wood fibre/polypropylene fibre composites made by non-woven web technology has been evaluated. The composite panels were made with 70 or 85% wood fibre, wiht the MAPP being incorporated in the panels at a level of 1 or 3% by spraying an emulsified form on the wood ...
A.M. Krzysik, J.A. Youngquist
openaire   +1 more source

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