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Front	Back	hint
[blank] t Uploading Image...	t Uploading Image...	t Uploading Image...	t R
1 t <p>What are the steps of PLA Synthesis?</p> Uploading Image...	t <p>Lactide is mixed with Tin Octanol and added Heat and Time</p> Uploading Image...	t Uploading Image...	t R
2 t <p>What is a Number Average Molecular Weight (Mn)?</p> Uploading Image...	t <p>The number represents the average number of repeating subunits in a polymer</p><p> </p><p>=sum of (frequency of A x size of A)/ total number</p><p> </p><p> </p> Uploading Image...	t Uploading Image...	t R
3 t <p>What is the structure of an Amorphous Polymer?</p> Uploading Image...	t Polymer chains making up the solid mass are completely randomly arranged Uploading Image...	t Uploading Image...	t R
4 t What is the strucutre of a SemiCrystalline Polymer? Uploading Image...	t <p>Solid mass is composed of randomly arranged chains in some areas and chains which are arranged in an orderly but short range fashion in other areas</p> Uploading Image...	t Uploading Image...	t R
5 t Polymer can be completely Crystalline. True or False? Uploading Image...	t FALSE Uploading Image...	t Uploading Image...	t R
6 t <p>What are the comparisons of General properties of Amorphous and Semicrystalline Polymers?</p> Uploading Image...	t <p>1. Amorphous:</p><p>-High free volume</p><p>-Possesses a glass transition temp(Tg)</p><p> </p><p>2. Semicrystalline:</p><p>-Low free volume</p><p>-Possesses both a glass transition temp(Tg) and a melting temp(Tm)</p> Uploading Image...	t Uploading Image...	t R
7 t <p>What is a Tg?</p> Uploading Image...	t <p>Glass Transistion Temp, which is specific to polymers. Above this temperature a polymer goes from hard brittle glass like material to a soft and felxible, rubber like material.</p> Uploading Image...	t Uploading Image...	t R
8 t What determines Tg? Uploading Image...	t <p>1. Backbone flexibility lowers Tg</p><p>2. Bulky pendent groups increases Tg by acting like an anchor (but can also decrease Tg by increasing free volume)</p> Uploading Image...	t Uploading Image...	t R
9 t PDLLA is a completely amorphous while PLA is semicrystalline. True or False? Uploading Image...	t <p>TRUE</p> Uploading Image...	t Uploading Image...	t R
10 t PGA is amorphous. True or False? Uploading Image...	t <p>False, PGA is Semicrystalline</p> Uploading Image...	t Uploading Image...	t R
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