Preparation and mechanism of weather⁃resistant polypropylene based on maleic anhydride⁃styrene alternate copolymer

doi:10.19491/j.issn.1001-9278.2025.06.001

Abstract

Abstract:

This study investigates the use of maleic anhydride⁃styrene alternate copolymer （MSL） to develop weathering⁃resistant polypropylene （PP）. The relative molecular weight， mechanical properties， and yellowing index of MSL⁃modified PP were evaluated before and after UV⁃accelerated aging. The results indicated that at 0.1 wt% MSL， the material retained mechanical properties post⁃aging equivalent to those modified with commercial hindered amine light stabilizers （HALS）. The MSL particles （≈400 nm in size） achieved homogeneous dispersion within the PP matrix. UV light was reflected while absorbing and re⁃emitting low⁃energy blue light， synergistically reducing UV⁃induced degradation. Even minimal MSL loading significantly enhanced the weatherability of the substrate， demonstrating its efficiency as a cost⁃effective UV stabilizer. These results position MSL as a promising additive for durable PP applications in outdoor environments.

Key words: maleic anhydride?styrene linear copolymer, polypropylene, ultraviolet light aging resistant

CLC Number:

TQ325.1⁺4

LAI Jinmei, GUO Zhaoyan, RU Yue, QI Guicun, CAI Chuanlun, SONG Zhihai. Preparation and mechanism of weather⁃resistant polypropylene based on maleic anhydride⁃styrene alternate copolymer[J]. China Plastics, 2025, 39(6): 1-5.

Figures/Tables 7

Fig.1. Effects of MSL contents and UV aging time on the change of charpy notched impact strength of polypropylene

Fig.2. Effects of MSL contents and UV aging time on the change of YI index of polypropylene

样品	M_W	M_N	M_Z	PD
M60ET	179 496	22 599	536 626	7.94
M60ET，240 h	99 047	13 499	307 848	7.34
0.1 %944，M60ET	179 764	22 230	529 302	8.08
0.1 %944，M60ET，240 h	175 118	21 466	512 648	8.16
0.1 %MSL，M60ET	181 989	21 734	560 764	8.37
0.1 %MSL，M60ET，240 h	174 895	20 957	515 487	8.35

Tab.1. Molecular weight and distribution of modified M60ET

Fig.3. SEM of MSL、polypropylene resin matrix and modified polypropylene

Fig.4. SEM of fracture surface of the modified polypropylene

Fig.5. Effects of MSL contents on the UV reflectance of polypropylene

Fig.6. Effect of MSL on the fluorescence effect of PP

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