Effect of long chain fatty acid sodium/sodium arylamide fatty acid compounding nucleating agent on properties of polypropylene

doi:10.19491/j.issn.1001-9278.2024.06.009

Abstract

Abstract:

The sodium salt of long chain fatty acid and sodium of arylamide fatty acid were compounded to form a compounding nucleating agent （SCAB）， and its effect on the crystallization and mechanical properties of polypropylene （PP） was investigated. The results indicated that the molecular structure of SCAB was not changed during its compounding process or at the processing temperature of PP， and its intermolecular aggregation state was significantly improved by the compounding process. The nucleated PP showed a significant increase in the crystallization rate， notch impact strength， and tensile strength with the extension of the carbon chain length of sodium salt of long chain fatty acid. The compounding did not affect the crystal growth mode of PP. Owing to the excellent dispersibility of SCAB in the PP matrix， a combination of SCAB with sodium stearate could refine the PP spherulites effectively and improve its crystal structure. This resulted in an increase in the crystallization rate of PP by 6.3 times， in the notch impact strength by 27.3 %， and in the tensile strength by 8.2 MPa.

Key words: polypropylene, long chain fatty acid sodium salt, sodium arylamide fatty acid, compounding, crystallization property, mechanical property

CLC Number:

TQ325.1⁺4

DONG Yapeng, ZHAO Tianjiao, WANG Meizhen, CUI Wenju, LIN Fuhua, WANG Bo. Effect of long chain fatty acid sodium/sodium arylamide fatty acid compounding nucleating agent on properties of polypropylene[J]. China Plastics, 2024, 38(6): 60-65.

Figures/Tables 10

Fig.1. FTIR spectra of the SCAB and complexes

Fig.2. Microscopic morphology of PP/SCAB composites

Fig.3. Correlation curves of non⁃isothermal crystallization behavior of the composites

样品编号	T_c/℃	T_m/℃	ΔH_m/J•g^-1	X_c /%
PP	116.1	165.2	73.14	41.32
PP/SCAB	129.3	165.3	73.96	41.78
PP/SCAB⁃14Na	130.1	165.3	79.31	45.26
PP/SCAB⁃16Na	130.4	165.3	82.45	47.05
PP/SCAB⁃18Na	130.5	165.4	86.15	49.16

Tab.1. Non⁃isothermal crystallization parameters of the composites

Fig.4. The isothermal crystallization curves of the composites at 135 ℃

Fig.5. The relative crystallinity of the composites varies with crystallization time at 135 ℃

Fig.6. The isothermal crystallization kinetics curves of the composites at 135 ℃

样品名称	T_c/℃	n	K	t_1/2/min	t’_1/2/min
PP	135	2.35	0.019	4.70	4.75
PP/SCAB	135	2.13	1.495	0.70	0.78
PP/SCAB⁃14Na	135	2.44	1.505	0.69	0.77
PP/SCAB⁃16Na	135	1.95	1.595	0.68	0.76
PP/SCAB⁃18Na	135	1.98	1.775	0.67	0.75

Tab.2. Isothermal crystallization kinetics parameters of the composites

Fig.7. Mechanical properties of the composite materials

Fig.8. The crystal morphology of the composites obtained by isothermal crystallization at 135 ℃

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