Special features of the molecular structure and gas permeability of hollow polypropylene fibres

1989 ◽  
Vol 31 (8) ◽  
pp. 1825-1832
Author(s):  
V.G. Andreyev ◽  
A.Sh. Goikhman ◽  
G.A. Budnitskii
Keyword(s):  
Molecular Structure ◽  
Gas Permeability ◽  
Polypropylene Fibres

scholarly journals The Impact of the Amount and Length of Fibrillated Polypropylene Fibres on the Properties of HPC Exposed to High Temperature / Wpływ Ilosci I Długosci Fibrylowanych Włókien Polipropylenowych Na Własciwosci Hpc Poddanego Działaniu Wysokiej Temperatury

2010 ◽  
Vol 56 (1) ◽  
pp. 57-68 ◽  
Author(s):  
I. Hager ◽  
T. Tracz
Keyword(s):  
High Temperature ◽  
Surface Water ◽  
Water Absorption ◽  
Transport Properties ◽  
High Performance ◽  
Gas Permeability ◽  
Research Programme ◽  
Polypropylene Fibres ◽  
Residual Transport ◽  
The Impact

Abstract This paper presents the results of research on high performance concretes (HPC) modified by the addition of polypropylene fibres (PP fibres). The scope of the research was the measurement of the residual transport properties of heated and recooled concretes: gas permeability and surface water absorption. Seven types of concrete modified with fibrillated PP fibres were tested. Three lengths: 6, 12 and 19 mm and three amounts of fibres: 0, 0.9 and 1.8 kg/m3 were used. The research programme was designed to determine which length of fibres, used in which minimum amount, will, after the fibres melt, permit the development of a connected network and pathway for gases and liquids.

scholarly journals Effect of molecular structure on the gas permeability of cellulose aliphatate esters

2013 ◽  
Vol 32 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Jing Chen ◽  
Jin-ming Zhang ◽  
Ye Feng ◽  
Jia-song He ◽  
Jun Zhang
Keyword(s):  
Molecular Structure ◽  
Gas Permeability

Molecular Structure of the Outermost Cell Wall Component of Spirillum Serpens

1977 ◽  
Vol 35 ◽  
pp. 342-343
Author(s):  
Wah Chiu ◽  
David Grano
Keyword(s):  
Molecular Structure ◽  
Cell Wall ◽  
Outer Membrane ◽  
Gel Electrophoresis ◽  
Electron Microscopic Examination ◽  
Electron Microscopic ◽  
Cell Wall Component ◽  
Protein Components ◽  
Exposure Technique ◽  
Structural Aspects

The periodic structure external to the outer membrane of Spirillum serpens VHA has been isolated by similar procedures to those used by Buckmire and Murray (1). From SDS gel electrophoresis, we have found that the isolated fragments contain several protein components, and that the crystalline structure is composed of a glycoprotein component with a molecular weight of ∽ 140,000 daltons (2). Under an electron microscopic examination, we have visualized the hexagonally-packed glycoprotein subunits, as well as the bilayer profile of the outer membrane. In this paper, we will discuss some structural aspects of the crystalline glycoproteins, based on computer-reconstructed images of the external cell wall fragments.The specimens were prepared for electron microscopy in two ways: negatively stained with 1% PTA, and maintained in a frozen-hydrated state (3). The micrographs were taken with a JEM-100B electron microscope with a field emission gun. The minimum exposure technique was essential for imaging the frozen- hydrated specimens.

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