Effects of POSS nanoparticles on glass transition temperatures of ultrathin poly(t‐butyl acrylate) films and bulk blends |
| |
| Authors: | Ufuk Karabiyik Rituparna Paul Michael C Swift Sushil K Satija Alan R Esker |
| |
| Institution: | 1. Department of Chemistry (0212), Virginia Tech, Blacksburg, Virginia;2. Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland |
| |
| Abstract: | As a model system, thin films of trisilanolphenyl‐POSS (TPP) and two different number average molar mass (5 and 23 kg mol?1) poly(t‐butyl acrylate) (PtBA) were prepared as blends by Langmuir–Blodgett film deposition. Films were characterized by ellipsometry. For comparison, bulk blends are prepared by solution casting and the samples are characterized via differential scanning calorimetry. The increase in Tg as a function of TPP content for bulk high and low molar mass samples are in the order of ～10 °C. Whereas bulk Tg shows comparable increases for both molar masses (～10 °C), the increase in surface Tg for higher molar mass PtBA is greater than for low molar mass (～22 °C vs. ～10 °C). Nonetheless, the total enhancement of Tg is complete by the time 20 wt % TPP is added without further benefit at higher nanofiller loads. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 175–182 |
| |
| Keywords: | amphiphiles glass transition LB films |
|
|
