Hot air aging behavior of polypropylene random copolymers

Relaxation of Shear-Induced Precursors in Isotactic Polypropylene and Random Propylene-Ethylene copolymers

Random hydrophilic-hydrophobic copolymers

We study a single statistical amphiphilic copolymer chain AB in a selective solvent (e.g. water). Two situations are considered. In the annealed case, hydrophilic (A) and hydrophobic (B) monomers are at local chemical equilibrium and both the fraction of A monomers and their location along the chain can vary, whereas in the quenched case (which is relevant to proteins), the chemical sequence al...

Fluctuation Theory of Random Copolymers

We investigate trie behavior of symmetric AB random copolymer melt near trie point of microphase separation in trie framework of a one-trop (Hartree-Fock) approximation, that exactly salves trie problem. We bave shown that composition fluctuations result to complete elimination of trie microphase separation predicted in trie frarnework a mean-field approximation [1-5]. Using variational techniq...

5. Investigating the Structure-property Behavior of Polydimethylsiloxane Based Segmented Polyurea Copolymers with a Second Polypropylene Oxide Soft Segment Component

5.1 CHAPTER SUMMARY Polypropylene oxide (PPO) was incorporated in a controlled manner between polydimethylsiloxane (PDMS) and urea segments in segmented polyurea copolymers and their solid state structure-property behavior was investigated. The copolymers contained PDMS segments of MW 3200 or 7000 g/mol and an overall hard segment content of 10-35 wt %. PPO segments of MW 450 or 2000 g/mol were...

Crystallization, Melting Behavior, Physical Properties, and Physical Aging of Ethylene/1-Octene Copolymers

The time dependence of the physical properties of ethylene/1-octene (EO)-copolymers after primary crystallization is investigated by calorimetry, density, and creep measurements. The temporal evolution of the multiple melting of EO-copolymers is monitored by differential scanning calorimetry. The low temperature endotherm displays an evolution similar to that observed for the enthalpy recovery ...