Answer to Question 1
In crystalline regions the polymer chains are tightly packed which results in a high density. The polymers in these crystalline regions have relatively strong intermolecular bonds which increase the stability of the polymer and increase most mechanical and physical properties. Amorphous regions are zones within the polymer structure where no crystallinity exists. Even highly crystalline polymers usually have some amorphous regions. The physical and mechanical properties for largely amorphous polymers are lower than analogous crystalline polymers.
Answer to Question 2
Small molecules have exact formulas which always apply. In polymers, the chains can be of varying length and so a general formula must be used. This general
formula represents the number of monomer units by an unknown
Answer to Question 3
The number average is dominated by the actual number of molecules and gives equal value to both large and small molecules. The weight average molecular weight gives greater value to the large, heavy molecules.
Exploring the functional activity of brain regions by using fMRI scans.
World Regions in Global Context: Peoples, Places, and Environments
The regions of the electromagnetic spectrum and their associated wavelengths
New patterns of gene expression can be generated by overlapping regions containing two different gen
Body Regions in the Somatosensory Cortex
Functional Regions of the Human Brain