Selective preparation of poly(p-oxybenzoyl) (POB) in copolymerization system of p-acetoxybenzoic acid (p-ABA) and m-acetoxybenzoic acid (m-ABA) was examined by using reaction-induced crystallization under shearing condition. POB crystals were mainly precipitated in liquid paraffin solution even at the content of m-ABA in feed (χf) of 30 mol% without stirring. In contrast to this, they were formed even at χf of 50 mol% and the fractionability was significantly enhanced by shearing. The mechanism of the fractional polycondensation was attributed to both the reactivity of monomer and the phase separation behavior of oligomer. Under shearing condition, the difference on the reactivity between p-ABA and m-ABA was lowered. However, the shearing induced the crystallization of homo-oligomers of p-oxybenzoyl unit more efficiently and prevented the precipitation of co-oligomers via crystallization. Thereby homo-oligomers were more rapidly and selectively precipitated by crystallization to form the POB crystals.
|Number of pages||1|
|Publication status||Published - Dec 1 2005|
|Event||54th SPSJ Symposium on Macromolecules - Yamagata, Japan|
Duration: Sep 20 2005 → Sep 22 2005
|Other||54th SPSJ Symposium on Macromolecules|
|Period||9/20/05 → 9/22/05|
ASJC Scopus subject areas