کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5190253 | 1381201 | 2006 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Toughened poly(methyl methacrylate) nanocomposites by incorporating polyhedral oligomeric silsesquioxanes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have investigated the toughenability of poly(methyl methacrylate) (PMMA) using polyhedral oligomeric silsesquioxane (POSS) nanocages at loadings between 0 and 15 wt%. Three distinct POSS species were used: a crystallizable type that did not disperse on a molecular scale within the PMMA matrix (cyclohexyl-POSS), and two types of POSS that formed homogeneous mixtures over the loadings we have investigated (methacryl-POSS and trisilanol-phenyl-POSS). Each of the three types of POSS was able to toughen PMMA in slow-speed tension tests at loadings â¤5 wt%; however, the reproducibility was poor due to the high flaw sensitivity of these binary blends. Ternary blends containing both cyclohexyl-POSS and methacryl-POSS showed the greatest increase in tensile toughness and also excellent reproducibility of toughening. A blend containing 2.5 wt% of both cyclohexyl-POSS and methacryl-POSS maintained the same modulus as the unfilled PMMA while increasing the toughness by a factor of 4. Electron micrographs showed extensive particle-matrix debonding of the PMMA from the cyclohexyl-POSS crystallites and some evidence of plastic deformation on the fracture surface. In high rate (1000 sâ1) split-Hopkinson pressure bar (SHPB) tests, binary blends of POSS and PMMA were able to improve the impact toughness of PMMA; however, once again the combined addition of both cyclohexyl-POSS and methacryl-POSS led to the greatest reproducibility of toughening. Comparison with previous results suggests that in order to toughen PMMA with rigid fillers, weakly-adhering particles with sizes on the order of 100 nm are required.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 1, 3 January 2006, Pages 299-309
Journal: Polymer - Volume 47, Issue 1, 3 January 2006, Pages 299-309
نویسندگان
Edward T. Kopesky, Gareth H. McKinley, Robert E. Cohen,