Study on Properties of Polypropylene Modified with Combination of Zeolites and Organic Phosphate Salt

doi:10.19491/j.issn.1001-9278.2020.05.001

Abstract

Abstract:

Isotactic polypropylene (iPP)/zeolite and iPP/phosphate sodium nucleating agent (NA11)/zeolite compounds were prepared by a direct mixing method, and the effects of the type and content of zeolite on their crystallization temperature and mechanical properties were investigated. Furthermore, the synergistic effect from zeolite and organophosphates on the nucleation performance of the compounds was studied, and a kinetic analysis was performed for the crystalline improvement of iPP. The results indicated that the addition of zeolite improved the crystallization and mechanical properties of iPP significantly, and the type of zeolite was found to influence the performance of iPP. The ZSM?5?type zeolite could promote the formation of β?form crystal of iPP at the concentration over 5 wt%. The combination of zeolite and NA11 could further improve the mechanical properties of the compounds, and good rigidity and toughness were achieved for the compounds containing 0.1 wt% NA11 and 0.1 wt% 4A?type zeolite. The compounds gained an increase in flexural modulus by 35.2 % and in impact strength by 14.4 % compared to pure iPP, indicating a good balance between rigidity and toughness.

Key words: polypropylene, zeolite, organic phosphate sodium salt nucleator, mechanical property, crystalline property

CLC Number:

TQ325.1⁺4

Chao LI, Chuangchuang TONG, Xin MENG, Zhong XIN. Study on Properties of Polypropylene Modified with Combination of Zeolites and Organic Phosphate Salt[J]. China Plastics, 2020, 34(5): 1-8.

Figures/Tables 8

Fig.1. DSC curves of PP/zeolite system

Fig.2. XRD patterns of PP/zeolite?5 system

Fig.3. Mechanical properties of PP/zeolite system

Fig.4. Mechanical properties of iPP/NA11/zeolites systems

Fig.5. DSC curves for non?isothermal crystallization of iPP，iPP /4A and iPP/NA11/4A

Fig.6. Relative degree of crystallinity of iPP,iPP /4A and iPP/NA11/4A

样品	降温速率/ ℃·min^-1	结晶峰温度/℃	起始结晶温度/℃	半结晶时间/min
iPP	2.5	122.80	126.20	2.97
	5	119.43	123.09	1.77
	10	116.65	120.41	0.90
	20	113.42	117.51	0.53
	30	111.13	115.23	0.39
iPP/4A	2.5	125.09	127.79	1.66
	5	122.02	124.97	1.11
	10	119.22	121.99	0.60
	20	115.85	118.71	0.39
	30	113.37	116.68	0.29
iPP/NA11/4A	2.5	132.76	135.40	1.35
	5	130.28	133.02	0.94
	10	127.49	130.36	0.62
	20	124.43	127.46	0.33
	30	122.53	125.59	0.25

Tab.1. Non?isothermal crystallization parameters

Fig.7. Friedman plots of iPP, iPP/4A and iPP/NA11/4A

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