Poly chlorine precursor route

J. N. Wilking, B. Hsieh, and G. A. Arbuckle-Keil. Chlorine precursor route to poly(2-phenoxy p-phenylene vinylene) Synthesis and characterization. Synth. Met., 149(l) 63-72, February 2005. 

Figure 3. Synthesis of poly(phenoxy phenylene vinylene) via the chlorine precursor route...

The XPR has been used to synthesize poIy(2,5 dimethoxy p-phenylene vinylene)(DM-PPV) and the reaction is the same as shown in Figure 2 except that methoxy substituents are present at the 2 and 5 positions of the phenylene ring. The chlorine precursor route (CPR) is used to prepare poly(phenoxy phenylene vinylene) (PO-PPV) and the reaction is shown in Figures. ... 

Poly(phenoxy phenylene vinylene)(PO-PPV) is synthesized via the chlorine precursor route as shown in Figure 3. The CPR is preferred for preparation of precursor polymers with large substituents such as phenoxy. The precursor film is quite flexible and dynamic infrared linear dichroism (DIRLD) studies (stretching the polymer while recording the dynamic infrared spectra) are in progress. 

B. R. Hsieh, H. Antoniadis, D. C. Bland, and W. A. Feld. Chlorine precursor route to poly(p-phenylene vinylene)-based light emitting diodes, Adv. Mater. 7 36 (1995). 

Of course, the brute force method of reacting silica with ammonia or N2/H2 gases at temperatures in excess of 1,200°C will also yield crystalline sihcon nitride ceramics. Another route that does not involve chlorinated precursors consists of sintering a polymeric precursor such as poly[(methylvinyl)silazane]— [(CH3SiHNH)os(CH3SiCH = CH2NH)o.2] . 

The use of soluble precursor-polymers, which can subsequently be converted to a conjugated form, offers a route to pure materials with controlled morphology. It has been known for many years that poly(vinyl chloride) (PVC) can be thermally, chemically and photothermally dehydro-chlorinated to produce polyene (PA) chain sequences. Initiation occurs at random, and continuous conjugated-sequences are not obtained. As a result the maximum conductivity for iodine-doped dehydrochlorinated PVC is ca. 10 Scm" ... 

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