80 2 methodsandtechniques for synthesis characterization processing elemental analyses are only of value when the difference between the carbon or hydrogen content of the two comonomers is sufciently large if ...
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...Methodsandtechniques for synthesis characterization processing elemental analyses are only of value when the difference between carbon or hydrogen content two comonomers is sufciently large if composition cannot be determined by analysis chemical means problem can solved usually either spectroscopic methods example uv measurements e g styrene copolymers ir olen and nmr gas chromatographic combined with mass spectroscopy after thermal decomposition samples in principle a copolymer may also analyzing residual monomer suitable method polymerization it will necessary rst to separate precipitation followed careful recovery ltrate containing but direct generally preferred block graft characterized same manner however consideration must taken fact that they contain amounts homopolymers which removed more rened statistic involves determination reactivity ratios r copolymerization parameters as well calculation q values see chap molecular weight distribution thedegreeofpolymerization p andthemo...