The polyurethane segments show high intersegment attraction such as hydrogen bonding and may be able to crystallize and form hard segments. In such polymers hard segments with Tg well above normal ambient temperature are separated by polyol soft segments, which in the mass are rubbery in nature. Hard and soft segments are arranged alternate along the polymer chain.
Fig.7. Polyurethane chain configuration [32]
4.2.2. Polyurethane properties and advantages for product development
Polyurethanes are vastly used in development of the products like frames of snow Goggles and All terrain goggles, Food container’s insulation and gaskets etc. Material performs well to the qualitative requirement of troops and is equally good for hot summer in desert as well as in extreme cold up to -50oC in glacier regions. Certain properties of the …show more content…
Performance in Harsh Environments: Polyurethane is highly resistant to temperature extremes and also many chemicals will not cause material degradation therefore polyurethanes are highly useful in harsh environmental conditions.
4.2.2.11. Economical Manufacturing Process: Polyurethane can be used to develop both prototypes or bulk production runs. Low volume of production does not make much impact on cost effectiveness. Size ranges for PU articles vary from a couple grams to 2000lb parts.
4.2.2.12. Short Production Lead Times: Compared to conventional thermoplastic materials polyurethane has a significantly more economical tooling costs and relatively short lead time.
4.3. Ethylene Propylene Diene Monomer (EPDM) rubber
EPDM is a type of synthetic rubber and is an elastomer useful for a wide range of applications. Dienes currently used in the manufacture of EPDM rubbers are dicyclopentadiene (DCPD), vinyl norbornene (VNB) and ethylidene norbornene (ENB). EPDM rubber is a terpolymer of ethylene, propylene, and a diene-components and is closely related to ethylene propylene rubber, a copolymer of ethylene and propylene
Fig.7. Polyurethane chain configuration [32]
4.2.2. Polyurethane properties and advantages for product development
Polyurethanes are vastly used in development of the products like frames of snow Goggles and All terrain goggles, Food container’s insulation and gaskets etc. Material performs well to the qualitative requirement of troops and is equally good for hot summer in desert as well as in extreme cold up to -50oC in glacier regions. Certain properties of the …show more content…
Performance in Harsh Environments: Polyurethane is highly resistant to temperature extremes and also many chemicals will not cause material degradation therefore polyurethanes are highly useful in harsh environmental conditions.
4.2.2.11. Economical Manufacturing Process: Polyurethane can be used to develop both prototypes or bulk production runs. Low volume of production does not make much impact on cost effectiveness. Size ranges for PU articles vary from a couple grams to 2000lb parts.
4.2.2.12. Short Production Lead Times: Compared to conventional thermoplastic materials polyurethane has a significantly more economical tooling costs and relatively short lead time.
4.3. Ethylene Propylene Diene Monomer (EPDM) rubber
EPDM is a type of synthetic rubber and is an elastomer useful for a wide range of applications. Dienes currently used in the manufacture of EPDM rubbers are dicyclopentadiene (DCPD), vinyl norbornene (VNB) and ethylidene norbornene (ENB). EPDM rubber is a terpolymer of ethylene, propylene, and a diene-components and is closely related to ethylene propylene rubber, a copolymer of ethylene and propylene