Preparation and Characteristic of Polyurethane Powder Adhesives with Heating Resistance Modified by Nanosilica

Table 1

The thermal properties.

Samples	T5%(°C)	T50%(°C)	Tmax(°C)	Tg (°C)
PPU	279.5	377.0	407.2	56.1
PPSA	276.5	386.6	408.0	55.2
PPSI	272.9	378.2	405.0	52.4
PPST	286.2	389.8	404.0	54.2
PPSY	288.1	390.4	404.8	57.1