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JPolySciPolyChem_46_3795_08.pdf - + x

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ing the degree of crosslinking to be determined.

IR measurements were performed using a Bio-Rad FTS-6000 spectrometer equipped with a

Scheme 1. Chemical structure of TEGDMA.

anu uc ctimmcnvny rrrove towaru rower irequen-cies; (ii) the dielectric strength of the main relaxation process decreases; and (iii) the shape of the 7-relaxation peak systematically broadens. These changes indicate that the materiał is poly-merizing under these conditions. Experiments performed at the same temperaturę but lower pressure (p = 500 MPa) show polymerization but at a significantly reduced ratę. No reaction was observed at ambient pressure (p 0.1 MPa), even at T = 393 K. Thus, substantial

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Journal of Polymer Science: Part A: Polymer Chemistry

DOI 10.1002/pola

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PRESSURE-INDUCED POLYMERIZATION OF TEGDMA 3797

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Potyroenzałon camed out at T =303 K_4-and Pa 1 GPa    *

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T = 303 K, p = 1 GPa, and / = 96 h (Panel b) and at T = 373 K, p = 1 GPa, and t = 15 h (Panel c). From data in Panels a and b, glass transitions temperatures were estimated,

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