Please enable JavaScript.
Coggle requires JavaScript to display documents.
HOMOGENEOUS POLYMERIC MATERIALS (FACTOR AFFECTING CRSTALLINITY…
HOMOGENEOUS POLYMERIC MATERIALS
AMORPHOUS STATE
does not display constant distance between macromolecules or any regularity of the arrangement or orientation
contain no pigments or fillers are transparent
no long range order
CRYSTALLINE STATE
SEMI-CRYSTALLINE
HIGHLY CRYSLTALLINE
HIGHLY AMORPHOUS
CHARACTERISTIC OF PLASTIC BECAUSE:
they combine the strength of crystalline polymers with the flexibility of amorphous.
Semi-crystalline polymers can be tough with an ability to bend without breaking
REQUIREMENT FOR CRYSTALLINITY
ORDER,REGULAR CHAIN STRUCTURE
SECONDARY FORCES HOLDING THE CHAINS TOGETHER IN THE LATTICE MUST BE STRONG
CRYSTALLIZATION PROCESS
GROWTH
The growth of polymer crystal take place where nuclei growth by addition of further chain. It can be seen by the changing of spherulites radius. The spherulites become larger and touching to each other and then stop to growth
NUCLEATION
The creation of stable nucleus ( the formation of small nuclei) randomly throughout the melt which is small molecules tendency to align and form small ordered regions. Nuclei are active sites for the growing of crystal.
SPHERULLITES
FACTOR AFFECTING CRSTALLINITY
INTERMOLECULAR BONDING
TACTICITY
SYMMETRY
BRANCHING
PHYSICAL PROPERTIES
MECHANICAL PROPERTIES
OPTICAL PROPERTIES
DEGREE OF POLYMER CRYSTALLINITY
b) Crystallization and Melting: Observation by Thermal Analysis
c) Observation by Density Analysis
a) X-ray Diffraction