Anastasiia Kashirina

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Questions related from Anastasiia Kashirina

What did I wrong in my poly(L-lactic acid) synthesis?

I used 150 g of L-lactide (liquid, stored in a fridge at 2-4 degr.C), 0,8 g of Sn(Oct)2 as a catalyst. I mixed L-lactide and Sn(Oct)2 in a glass, than placed the glass into an oven at 140 degr.C...

09 September 2019 911 9 View

Why is it possible to have shape memory effect in a polymer even if I don't reach Tg or Tm of this polymer?

I tried to "program" pure polyurethane (Tg is minus 44 degrees, Tm is about 170 degrees) to check its ability to fix and recover shape. The temperature cycle was 1) 90 degr., bend in half; 2)...

01 January 1970 4,917 7 View