Solid State Polymorphism of Isotactic and Syndiotactic Polypropylene
The crystal structure and polymorphism of isotactic (iPP) and syndioactic polypropylene (sPP) are illustrated, highlighting the rich variety of phase behavior of these polymers, the conditions of obtainment of the different polymorphs and the disorder phe
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Solid State Polymorphism of Isotactic and Syndiotactic Polypropylene Finizia Auriemma, Claudio De Rosa, Anna Malafronte, Miriam Scoti and Rocco Di Girolamo
Contents 2.1 Introduction........................................................................................................................ 38 2.2 Chain Conformation of Isotactic and Syndiotactic Polypropylene in the Crystalline State ................................................................................................................................... 40 2.2.1 Isotactic Polypropylene .......................................................................................... 41 2.2.2 Syndiotactic Polypropylene .................................................................................... 44 2.3 Crystal Polymorphism of Isotactic Polypropylene ........................................................... 44 2.4 The Crystal Structure of a Form ...................................................................................... 48 2.4.1 The Crystal Structure of c Form............................................................................ 52 2.4.2 Structural Disorder of c Form of iPP .................................................................... 57 2.4.3 Crystal Structure of b Form ................................................................................... 59 2.4.4 Mesomorphic Form of iPP..................................................................................... 61 2.4.5 Crystal Structure of the Trigonal Form of iPP ...................................................... 63 2.4.6 The “New Mesomorphic” Form in Copolymers of Isotactic Polypropylene with Branched Comonomers .................................................................................. 68 2.5 Crystal Polymorphism of Syndiotactic Polypropylene..................................................... 72 2.5.1 Crystal Structure of Form I.................................................................................... 75 2.5.2 Structural Disorder in Form I................................................................................. 79 2.5.3 Crystal Structure of Form II................................................................................... 84 2.5.4 Structural Disorder in Form II ............................................................................... 88 2.5.5 Crystal Structure of Form III ................................................................................. 93 2.5.6 Crystal Structure of Form IV ................................................................................. 97 2.5.7 The Trans-planar Mesomorphic Form of sPP ....................................................... 98 2.5.8 Helical Mesophase in Syndiotactic Copolymers of Propylene ............................. 105 2.6 Conclusions........................................................................................................................ 106 References ................................................................................................
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