Polypropylene damage analysis

There are two different widely used imprint methods in damage analysis, namely imprints on gelatine-coated plates and on thermoplastic films, usually polypropylene or polystyrene. In Table 8.7 the most important advantages of these complementary imprint methods are compared. 

Rawal A, Sayeed MMA. Mechanical properties and damage analysis of jute/polypropylene hybrid nonwoven geotextiles. Geotextiles and Geomembranes 2013 37 54-60. 

Several studies of a related nature have appeared on the photocrosslinking of polyethylene by benzophenone identifying benzopinacol as the main product by FT NMR analysis.Benzoin ethers have been used for the same reaction while in polypropylene little damage was found in terms of the morphological structure of the polymer. ... 

In spite of the fact that scratch resistance is very important requirement only a limited number of credible studies have been done. This research is very difficult to conduct.Recently, image analysis was employed to overcome some of the technical difficulties associated with the interpretation of observations. In addition to the damage of the scratch itself, the surrounding areas show stress whitening which adds to the perceived damage. The use of plastics in the automotive industry, especially the wide use of polypropylene makes these studies very important in the development of high quality finished products. 

Analysis of damage to polyolefin fibres, especially polypropylene... 

One recent application in lEC consists of solid phase extraction disks which are used to eliminate matrix interference prior to analysis. The disk contains a membrane composed of resin beads enmeshed in a PTFE membrane, housed in a polypropylene housing. The resin is treated to remove specific ions such as H+ to remove hydroxide, Ag+ for excess halides and Ba to remove sulphate. Other disks such as hydroxide for acid removal and neutral styrene-divinylbenzene to eliminate hydrophobic components which can damage resin based IC columns are being developed [23]. 

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