Polymer Physics

Polymer structures can be roughly divided into two categories, i.e. single-chain structure and their assembled structures. In th ...

Question Sets Why do we say that polymer physics mainly focuses on the chain-like structures? Why do polymers belong to soft ma ...

Part I Chain Structure ...

Chapter 2 Structure–Property Relationships 2.1 Characterization of Chemical Structures.................. Polymer chain structure ...

atoms in the diamond. The most stable geometric conformation of molecules often determines the azimuths of the packing neighbors ...

ideal-chain modelof a single polymer chain. In order for a simple statistical estimation, a long-enough ideal chain has been ass ...

XX j>i bibj¼ 0 (2.4) Accordingly, we obtain <R^2 f:j:>¼nb^2 (2.5) where<...>means the ensemble average over many ...

monomers on a real polymer chain has a restricted bond angle. However, even if the bond angle keeps fixed, the internal rotation ...

potential energy of internal rotation will increase due to the strong volume exclusion of two overlapping substitutes, which is ...

physical meanings: one is the potential energy differenceDebetweentransand gaucheconformations, and the other is the potential e ...

less than the sum of two van der Waals radii of the carbon atoms, which means that the carbon ends of the pentane segment will o ...

bK¼ <R^2 > L (2.13) Stiffness parameter or steric hindrance The stiffness parameter,orsteric hindrance, is defined by s ...

hierarchical functions at different levels of polymer assembly. Protein folding can be regarded as a typical example of this cas ...

2.4 Molecular Weights and Their Distributions 2.4.1 Molecular Weight Effects With the increase of molar masses from the lower en ...

Chemical activity Polyoxymethylene (POM) and polycarbonate (PC) often start thermal degradation from the chain ends. If their ...

and theweight-average molecular weightby MW P WiMi P Wi ¼ P NiM^2 i P NiMi (2.18) Here the molecular weight commonly means the ...

In the early history of polymer sciences, the measurement of molecular weights was the key experimental evidence proving the pre ...

MN¼ SHi SHi=Mi (2.25) In recent years, the technology of mass spectroscopy has been well developed. The matrix-assisted Laser de ...

Long-chain branching and tree-like polymers exhibit quite different flow behaviors compared to linear polymers. They can be a go ...

epoxy resin and the unsaturated polyester resin (commonly reinforced by the glass fibers), which exhibit a good thermal resistan ...