need someone expert in Crystal structures, plastics, and sand casting cuz i have HW on this

Problem  1:  Research  a  commonly  used  plastic  that  we  did  not  talk  about   in  class.  Tell  me  how  it  is   created,  how  it  is  destroyed,  and  the  common  products  that  are  made   from  it.  Also  tell  me  a  little   about  the  different  crystal  structures  the  plastic  can  take  as  well  as  how   this  changes  its  behavior.       Problem  2:  Research  a  commonly  used,  biodegradable,  plastic  that  we   did  not  talk  about  in  class.  Tell   me  how  it  is  created,  how  it  is  destroyed,  and  the  common  products  that   are  made  from  it.  Also  tell   me  a  little  about  the  different  crystal  structures  the  plastic  can  take  as   well  as  how  this  changes  its   behavior.     Problem  3:  Research  a  product  that  is  made  from  sand  casting  and  tell   me  step  by  step  how  the   product  is  made.         Problem  4:  Examine  the  properties  of  aluminum  and  extruded  vinyl  as   they  relate  to  household   window  frames.  Discuss  the  pros  and  cons  of  each,  considering  both   ease  of  manufacture  and   performance.  Which  would  you  prefer  for  Las  Cruces,  NM?  Would  your   preference  change  if  you   lived  in  Hawaii?       Problem  5:  Draw  a  stress-­‐strain  curve  for  a  metal  which  you  think   would  be  very  suitable  for  use  as  an   axel  on  an  18  wheeler.  Give  a  very  detailed  explanation  as  to  why  your   curve  is  most  suitable.