Polypropylene carbonate

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Structural formula
Structural formula polypropylene carbonate
General
Surname Poly (propylene carbonate)
other names

Polypropylene carbonate, PPC

CAS number 25511-85-7
Monomers Propylene oxide , CO 2
Molecular formula of the repeating unit C 4 H 6 O 3
Molar mass of the repeating unit 102
Brief description

colorless solid

properties
Physical state

firmly

Glass temperature

25-45 ° C

safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Polypropylene carbonate ( PPC ) is a thermoplastic copolymer from the group of polycarbonates , made from the building blocks carbon dioxide and propylene oxide . Catalysts such as zinc glutarate are used for the polymerization .

properties

Polypropylene carbonate is soluble in polar solvents such as lower ketones , ethyl acetate and dichloromethane and insoluble in alcohols , water and aliphatic hydrocarbons. PPC is permeable to oxygen. The glass transition temperature (T g ) is between 25 and 45 ° C. PPC is usually atactic and therefore does not crystallize.

The refractive index is 1.46 and the dielectric constant is 3.

presentation

Like polyethylene carbonate , it is formed from the reaction of an epoxide (here propylene oxide ) with carbon dioxide in the presence of an organometallic catalyst, typically organozinc compounds . The by-product is propylene carbonate , which is a valuable solvent .

Applications

Polypropylene carbonate is used to increase the resistance of epoxy resins . The material is also used as a binder in the ceramics industry, where it is decomposed during the sintering process and escapes. Composite materials made from propylene carbonate and starch are used as biodegradable plastics.

proof

  1. ↑ a b c d data sheet Poly (propylene carbonate), average M at Sigma-Aldrich , accessed on December 24, 2013 ( PDF ).
  2. ↑ a b K. Upidi, JK Gillham, Poly (ethylene carbonate) and Poly (propylene carbonate): Transitions and thermomechanical spectra, J. Appl. Polym. Sci. 1974 , 18 , 1575-1580. doi : 10.1002 / app.1974.070180525
  3. ↑ a b c G. A. Luinstra, E. Borchardt: Material Properties of Poly (Propylene Carbonates); Adv. Polym. Sci. 2012 , 245 , 29-48, doi : 10.1007 / 12_2011_126 .
  4. ↑ S. Inoue, H. Koinuma, T. Tsuruta, Copolymerzation of carbon dioxide and epoxide with organometallic compounds, Makromolekulare Chemie 1969 , 130 , 210-220. doi : 10.1002 / macp.1969.021300112

literature