Dynamic Mechanical Analysis of PMMACellulose Blends
| dc.contributor.author | Merenga, Abdullah S. | |
| dc.contributor.author | Katana, G.A | |
| dc.date.accessioned | 2012-10-30T11:33:51Z | |
| dc.date.available | 2012-10-30T11:33:51Z | |
| dc.date.issued | 2010 | |
| dc.description | Publisher version (Taylor & Francis) available at http://dx.doi.org/10.1080/00914030903538553 | en_US |
| dc.description.abstract | Dynamic mechanical analysis (1–30 Hz, 274–414 K) is employed to study the inter- and intramolecular dynamics in a set of PMMA-CELL blends. Two relaxation processes are observed, the dynamic glass transition (a-relaxation) being characterized by WLF law and secondary transition (b-relaxation). The a-relaxation is strongly influenced by the composition of the blends and shows a rapid slowing down with increasing cellulose (CELL) intake. Increasing the content of the latter reduces the strength of the b-relaxation strongly and increases its activation energy by more than 60%. This proves that owing to the interactions between the cellulose hydroxyl group and PMMA ester group, the b-relaxation no longer has a local character only. By fitting the Tg data for the blends to Tg-composition models proposed by Gordon and Taylor and by Jenckel and Heusch, it is shown that the strength of the interaction increases strongly beyond 72% of CELL intake. | en_US |
| dc.identifier.citation | International Journal of Polymeric Materials, 60:115–123, 2011 | en_US |
| dc.identifier.uri | http://ir-library.ku.ac.ke/handle/123456789/5875 | |
| dc.language.iso | en | en_US |
| dc.publisher | Taylor & Francis | en_US |
| dc.subject | cellulose | en_US |
| dc.subject | curve fitting | en_US |
| dc.subject | dynamic mechanical analysis | en_US |
| dc.subject | glass transition temperature | en_US |
| dc.subject | mechanical relaxation parameters | en_US |
| dc.subject | poly(methylmethacrylate) | en_US |
| dc.title | Dynamic Mechanical Analysis of PMMACellulose Blends | en_US |
| dc.type | Article | en_US |