Thermal Stability of Shear-Induced Precursors and Their Effect on the Crystalline Structure of β-Nucleated Isotactic Polypropylene

Table 1

Relative β-phase content and relative shear efficiency of β-nucleated iPP under different relaxed conditions.

Crystallization condition	Relaxation temperature (°C)	Relaxation time (min)	RSE
Quiescent	—	—	0	0.97
Sheared	—	—	1	0.81
Partially relaxed	170	5	0.92	0.87
	170	10	0.83	0.92
	170	15	0.75	0.95
	170	30	0.48	0.97
	180	2	0.86	0.93
	180	5	0.73	0.96
	190	2	0.76	0.95
	190	3	0.53	0.96
	190	5	0.42	0.97