Melt spinnabilities of thermoplastic paramylon mixed esters.

The low thermoplasticities of polysaccharide esters make them unsuitable for melt spinning. In this study, we aimed to overcome this problem by mixed esterification of paramylon, a euglenoid β-1,3-glucan with short- and medium-chain acyl groups, as melt-spinnable materials. Thermal analyses revealed that all the synthesized paramylon mixed esters exhibited glass transition temperatures greater than 100 °C; some of them showed large differences between the melting and 5%-weight-loss temperatures (5s) and are extrudable through a spinneret at a temperature ~100 °C below 5, rendering them potential candidates for the production of melt-spun filaments.

Ion-exchange synthesis, crystal structure, and physical properties of hydrogen titanium oxide H2Ti3O7.

Hydrogen titanium oxide H2Ti3O7 was prepared from Na2Ti3O7 as a parent compound via Na(+)/H(+) ion exchange in acidic solution at 333 K. It crystallizes in the monoclinic system, space group C2/m, and the lattice parameters of a = 16.0380(8) Å, b = 3.