In order to improve the properties of plexi glass and develop new product

the possibility for preparing crosslinking polymethyl methacrylate was tried.

Three methods were carried out:

A. Methyl methacrylate was polymerized in bulk at room temperature.

B. Radiation polymerization of methyl methacrylate in the supercooled liquid phase between the range of -20—-10℃ were observed.

C. Under certain experimental conditions

highly crosslinked polymethyl methaery-late could be formed. Crosslinked polymer of

M

c

=2×10

4

means linear polymer with molecule weight of 2×10

6

which had 100 crosslinking points.

The measurement of

M

c

average molecular weight between crosslinks was established by measuring the swelling capacity of crosslinking polymethyl methacrylate.