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.
Nine Abdominal Anatomic Regions
The pancreas. This organ sits just below the stomach and is both an exocrine and an endocrine gland.
Anterior and posterior views of the body illustrating the location of various body regions.
Retrograde pyelogram. A contrast medium is injected into the ureter using a cystoscope, and the X-ra
wild discuss fish
Dolores Huerta and Cesar Chavez, leaders of the United Farm Workers, discuss their 1968 strike of ...