Polymer blends of polybenzoxazine (PBA-a) and polycaprolactone (PCL) of different molecular weights (M n 5 10,000, 45,000, and 80,000 Da) were prepared at various PBA-a/PCL mass ratios and their properties were characterized. The results from dynamic mechanical analyzer (DMA) revealed two glass transition temperatures implying phase separation of the two polymers in the studied range of the PCL contents. Moreover, a synergistic behavior in glass transition temperature (T g ) was evidently observed in these blends with a maximum T g value of 281 C compared with the T g value of 169 C of the PBA-a and about 250 C of the PCL used. The blends with higher M n of PCL tended to provide greater T g value than those with lower M n of PCL. The modulus and hardness values of PBA-a were decreased while the elongation at break and area under the stress2strain curve were increased with an increase of the content and M n of PCL, suggesting an enhancement of toughness of the PBA-a. Scanning electron micrographs (SEM) of the sample fracture surface are also used to confirm the improvement in toughness of the blends. V C 2015 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2015, 132, 41915.
This research is divided into 2 parts. In part I, the optimal ratio of polymer blends between chitosan (CS) with carboxymethyl cellulose (CMC) by using glutaraldehyde (GL) as crosslinked agent. In part II, the effect of starch on the properties of polymer blends was determined. The chemical interaction of the blends was studied with Fourier Transform Infrared Spectroscope (FT-IR). The thermal properties of polymer blends were also determined with differential scanning calorimeter (DSC) and thermogravimetric analyzer (TGA). Moreover, the study of physical property was performed with a Swelling Test method. From test results in part I, the optimal ratio between CS (0.8%w/v) and CMC (0.8%w/v) was 3:2 by volume. Furthermore, the FT-IR spectra reveals the chemical interaction (C=N). In part II, the blend which was added with 50 percent by weight of starch show the highest glass transition temperature. The maximum rate of decomposition temperature and the percentage of swelling were increased with the increase of starch.
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