Poly(3-hydroxyalkanoate) (PHA) with a thiophenoxy group at the end of the side chain
was obtained from Pseudomonas putida 27N01, using 11-thiophenoxy undecanoic acid as the sole carbon
source. NMR and GC/MS analyses indicated that the polymer consisted of 3-hydroxy-5-thiophenoxypentanoate as the primary monomer unit and 3-hydroxy-7-thiophenoxyheptanoate as a minor unit. The
polymer had a white cream color and was elastometric. X-ray analysis suggested that the PHA had an
amorphous-like diffraction pattern. The final dry cell concentration was 693 mg/L, and the PHA content
of the dry cells was 19.5%. GPC measurement with polystyrene as a standard showed that the number-average molecular weight was 81 000 with a polydispersity of 1.8. The glass transition temperature was
approximately 4 °C according to DSC. Thus, we were able to successfully characterize this PHA and to
show that a sulfur atom can be incorporated into the bacterial polymer produced from P. putida 27N01.
The effect of in-situ formation of reinforcing phase on the mechanical properties of FeAl intermetallic alloy was studied. The in-situ FeAl composites containing Al 2 O 3 or Fe 3 AlC were fabricated by mechanical alloying of elemental powders and mill scale powder followed by vacuum hot pressing. The starting materials were mixed in the appropriate ratio to synthesize 10 vol% of the reinforcing phase. FeAl+Al 2 O 3 and FeAl+Fe 3 AlC alloys showed high hardness value of HV813 and HV524, respectively. The effect of testing temperature on the 0.2% proof stress was evaluated at the temperature range from room to 1 273 K under compression. FeAl + Al 2 O 3 and FeAl + Fe 3 AlC alloy showed proof stress of 2 240 MPa and 1 380 MPa at room temperature, respectively. At higher temperatures above 773 K the proof stress decreased rapidly. The FeAl base in-situ composites including Fe 3 AlC or Al 2 O 3 showed the high stress exponent and activation energy in the temperatures range of 1 073 -1 273 K.
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