Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5201849 | Polymer Degradation and Stability | 2014 | 8 Pages |
Abstract
Maleic anhydride (MA) was grafted onto poly(β-hydroxybutyrate) (PHB) chains by using styrene (St) as co-monomer and dicumyl peroxide (DCP) as free-radical initiator. The grafting degree of MA was increased from 0.2 wt% to 0.9 wt% with the St/MA ratio up to 2/1. The St-assisted grafting mechanisms are revealed based on titration, thermogravimetric analysis and infrared analysis, i.e. MA is grafted onto PHB chains by way of single monomers and charge-transfer-complex (CTC) at the St/MA ratios of â¤1/1, while St-co-MA oligomers are the dominating grafting pendants when the St/MA ratios â¥2/1. The decomposition temperature (Td-5%) of PHB is raised by approx. 35 °C after grafting of the MA and/or short St/MA pendants, meanwhile higher molecular weight of the PHB is obtained. In addition, the crystallization of PHB is promoted by grafting of the MA or MA-co-St oligomers. The crystallization mechanism of maleated PHB is proposed as well.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Piming Ma, Xiaoxia Cai, Xianwen Lou, Weifu Dong, Mingqing Chen, Piet J. Lemstra,