Effect of Zeolite⁃loaded Organophosphate Nucleation System on Properties of Polypropylene

doi:10.19491/j.issn.1001-9278.2021.09.015

Abstract

Abstract:

A nucleation system based on the zeolite-loading organic phosphate （MBP） was fabricated through a solution immersion method， the influence of this nucleation system on the crystalline and mechanical properties of isotactic polypropylene （iPP） was investigated. The effect of different types of zeolites on the dispersion of MBP was characterized using scanning electron microscope （SEM） to investigate the reason why the zeolites can improve the nucleation of MBP in iPP. The results indicated that the MBPs loaded with B-zeolite-1 and B?zeolite-2 had little effect on the performance enhancement of iPP. However， both of them improved the properties of iPP significantly. The nucleated iPP achieved an increase in crystallization temperature by 10 and 6.0 °C for he MBPs loaded with B-zeolite-1 and B-zeolite-2， respectively. The stiffness and toughness increased synchronously. The flexural modulus resulting from the MBPs loaded with B?zeolite-1 and B-zeolite-2 increased by 29.9 % and 13.0 %， respectively. The impact strength from the MBPs loaded with B?zeolite-1 and B?zeolite-2 increased by 8 % and 7 %， respectively. SEM observation indicated that the A?zeolite-1 was well dispersed in the MBP， generating a good nucleation effect on the crystallization of iPP. B-zeolite-1 showed serious self-agglomeration and could not be dispersed in the MBP. Therefore， it cannot act as a nucleation agent to promote the nucleation of MBP.

Key words: polypropylene, zeolite, organic phosphate, crystalline property, mechanical property

CLC Number:

TQ325.1⁺4

MENG Xin, FAN Min, TONG Chuangchuang, LI Chao, GAO Jin, XIN Zhong. Effect of Zeolite⁃loaded Organophosphate Nucleation System on Properties of Polypropylene[J]. China Plastics, 2021, 35(9): 95-102.

Figures/Tables 11

Fig.1. Structure of NA11 and MBP

Fig.2. DSC curves of iPP/MBP?zeolite system

样品	结晶峰温度/℃	结晶焓/ J?g^-1	二次熔融焓/J?g^-1	结晶度/ %
iPP	119.3	93.1	66.5	31.8
iPP/MBP	120.0	94.3	66.6	31.9
iPP/MBP?B?zeolite?1	120.4	93.4	69.8	33.4
iPP/MBP?B?zeolite?2	120.5	94.3	66.6	31.9
iPP/MBP?A?zeolite?2	126.0	98.1	73.5	35.2
iPP/MBP?A?zeolite?1	129.8	101.3	75.3	36.6

Tab.1. Crystallization performance

Fig.3. Mechanical properties of iPP/MBP?zeolite system

Fig.4. Crystallization curves of three different systems of iPP at different cooling rates

样品	$结晶速率$ / ℃?min^-1	结晶峰温度/℃	半结晶时间/s
iPP	2.5	126.3	138.9
	5	123.4	79.8
	10	120.3	49.8
	20	116.8	28.8
	30	114.7	19.3
iPP/MBP?B?zeolite?1	2.5	126.5	135.2
	5	123.7	66.6
	10	121.3	43.6
	20	118.6	26.8
	30	116.8	17.8
iPP/MBP?A?zeolite?1	2.5	132.8	104.5
	5	130.9	58.4
	10	129.8	31.3
	20	124.9	18.6
	30	122.5	13.2

样品	$结晶速率$ / ℃?min^-1	结晶峰温度/℃	半结晶时间/s
iPP	2.5	126.3	138.9
	5	123.4	79.8
	10	120.3	49.8
	20	116.8	28.8
	30	114.7	19.3
iPP/MBP?B?zeolite?1	2.5	126.5	135.2
	5	123.7	66.6
	10	121.3	43.6
	20	118.6	26.8
	30	116.8	17.8
iPP/MBP?A?zeolite?1	2.5	132.8	104.5
	5	130.9	58.4
	10	129.8	31.3
	20	124.9	18.6
	30	122.5	13.2

Tab. 2. Tc and t1/2 of three different systems of iPP at different cooling rates

Fig.5. Relative crystallinity of three different systems as a function of temperature

Fig.6. Friedman curves of three iPP samples

Fig.7. Activation energy as a function of relative crystallinity curves of three iPP samples

Fig.8. SEM of MBP，A?zeolite?1，B?zeolite?1，MBP?A?zeolite?1 and MBP?B?zeolite?1 particles

Fig.9. SEM of iPP/MBP， iPP/MBP?A?zeolite?1 and iPP/MBP?B?zeolite?1 samples after etching

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