Weatherability of Polypropylene by Accelerated Weathering Tests and Outdoor Exposure Tests in Japan

Table 1

Attributes of polypropylene (PP) used in weathering experiments.

Code	Molecular structure	Additive formulation	MFR, g/10 min	Melting temperature, °C	Heat of fusion, J/g
①	PP homopolymer	Standard	7.4	166	122
②	PP homopolymer	Weather resistant	7.1	167	112
③	PP copolymer	Standard	3.3	166	94
④	PP copolymer	Weather resistant	3.4	166	105
⑤	PP copolymer	Standard	8.5	167	100
⑥	PP copolymer	Weather resistant	8.8	167	101

Antioxidant was melt-mixed.
Antioxidant and light stabilizer were melt-mixed.
Melt flow rate (MFR) was measured at 230°C and 2.16 kg.