Effect of α/β complex nucleating agent based on hexahydrophthalate on properties of polypropylene

doi:10.19491/j.issn.1001-9278.2022.07.017

Abstract

Abstract:

An α/β complex nucleating agent was prepared using the calcium salt of hexahydrophthalic acid as an α nucleating agent and the zinc salt of hexahydrophthalic acid as a β nucleating agent， and its effect on the mechanical properties and crystalline performance of isotactic polypropylene （iPP） was investigation. The Avrami theory was used to describe the isothermal crystallization kinetics of nucleated iPP. The results indicated that the α/β complex nucleating agent improved the rigidity and toughness of iPP synchronously. When the mixing ratio was set to 7∶3， the nucleated iPP obtained an increase in tensile strength by 6.7 %， in flexural modulus by 21.8 %， and in impact strength by 108.2 %. The effect of concentration of the α/β complex nucleating agent in iPP was further studied. The crystallization temperature of iPP increased gradually with an increase in the total addition amount of the complex nucleating agent. The mechanical properties of the nucleated iPP tended to be stable when the addition amount of the complex nucleating agent reached 0.4 wt%. Its impact strength increased by 175.3 %， flexural modulus increased by 15.0 %， and tensile strength increased by 6.5 %. The isothermal crystallization kinetic results indicated that the presence of the α/β complex nucleating agent system reduced the surface energy required for crystallization， shortening the crystallization time of iPP significantly.

Key words: isotactic polypropylene, mechanical property, α/β compound nucleating agent, hexahydrophthalate

CLC Number:

TQ325.1⁺4

YU Changyong, XIN Zhong. Effect of α/β complex nucleating agent based on hexahydrophthalate on properties of polypropylene[J]. China Plastics, 2022, 36(7): 121-128.

Figures/Tables 9

Fig.1. DSC curves of HHPA?Ca/HHPA?Zn compound nucleating agent with different compound ratios

Fig.2. Effect of HHPA?Ca/HHPA?Zn compound NA with different ratios on mechanical properties of iPP

Fig.3. DSC curves of iPP samples with different concentrations of HHPA?Ca/HHPA?Zn（7∶3） compound nucleating agent

Fig.4. XRD curves of iPP samples with different concentrations of HHPA?Ca/HHPA?Zn（7∶3） compound nucleating agent

HHPA⁃Ca/HHPA⁃Zn含量/%	β晶含量
0.05	0
0.1	0
0.15	0.078 0
0.2	0.130 9
0.25	0.149 1
0.3	0.164 5
0.4	0.168 0
0.5	0.175 9

Tab.1. β crystal content of iPP samples with different concentrations of HHPA?Ca/HHPA?Zn（7∶3） compound nucleation system

Fig.5. Effect of HHPA?Ca/HHPA?Zn（7∶3） compound NA with different concentration on mechanial properties of iPP

Fig.6. Isothermal crystallization curves of iPP/HHPA?Ca/HHPA?Zn and plots of relative crystallinity vs. time at different temperature

Fig.7. Plots of ln［-ln（1-Xt ）］ of iPP/HHPA?Ca/HHPA?Zn vs.ln t at different temperature

Fig.8. Plots of -lnt1/2+U*/R(Tc-T∞) vs. 1/[Tc?Tf] of the samples

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