Polymethacrylimide

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Structural formula
Polymethacrylimide structural element
General
Surname Polymethacrylimide
other names

Rohacell (trade name)

CAS number 25014-12-4
Brief description

White dust

properties
Heat resistance

up to 180 ° C

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

Polymethacrylimide is a polymer from which rigid plastic ( PMI ) and rigid foam ( PMI-E ) are made and belongs to the group of polyimides . It is used in aircraft and automobile construction, in medical technology and in construction for lightweight construction, mostly as a sandwich construction between two top layers made of high-strength plastics . Fishing floats and diaphragms for flat speakers can also be made from PMI. It is available on the market under the trade name Rohacell from Evonik Industries .

Manufacturing

A copolymer of methacrylic acid and acrylonitrile and is converted into polymethacrylimide by foaming at 170-210 ° C.

properties

PMI hard plastic and PMI-E hard foam are highly heat-resistant up to around 180 ° C, creep-resistant, fatigue-resistant and are characterized by high rigidity , homogeneous foam structure and simple shaping.

With PMI-E, the cell structure of the polymer can be modified using a special manufacturing method so that different strength values ​​result in the longitudinal plane and perpendicular to it. In contrast to hard plastic, the foam variant can absorb up to 65% moisture.

Individual evidence

  1. ↑ a b c Material Safety Data Sheet, Polymethacrylamides. (PDF) Polysciences, Inc., accessed March 8, 2015 .
  2. ↑ a b c N. Herrlich, W. Land, J. Kunz: Kunststoffpraxis: Properties , WEKA Media Verlag, 1999, ISBN 3-8111-5972-0 .
  3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
  4. ↑ a b Evonik Industries : ROHACELL® .
  5. ^ Karlheinz Biederbick: Kunststoffe , Vogel-Verlag, 4th edition, 1977, p. 115, ISBN 3-8023-0010-6 .