聚丙烯/碳纳米管微孔注塑发泡行为及力学性能

doi:10.19491/j.issn.1001-9278.2020.06.004

中国塑料 ›› 2020, Vol. 34 ›› Issue (6): 20-26.DOI: 10.19491/j.issn.1001-9278.2020.06.004

聚丙烯/碳纳米管微孔注塑发泡行为及力学性能

袁洪跃¹, 金章勇², 蒋晶²(), 刘宪虎¹, 赵振峰¹

^1.郑州大学橡塑模具国家工程研究中心，郑州 450002
^2.郑州大学机械与动力工程学院，郑州 450001

收稿日期:2020-01-13 出版日期:2020-06-26 发布日期:2020-06-26

Microcellular Injection Foaming Behaviors and Mechanical Properties of Polypropylene/Carbon Nanotubes Composites

Hongyue YUAN¹, Zhangyong JIN², Jing JIANG²(), Xianhu LIU¹, Zhenfeng ZHAO¹

^1.National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China
^2.School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China

Received:2020-01-13 Online:2020-06-26 Published:2020-06-26
Contact: Jing JIANG E-mail:jiangjing@zzu.edu.cn

摘要/Abstract

摘要：

研究了不同含量单壁碳纳米管(CNT)的加入对聚丙烯(PP)流变、热稳定性及微孔注塑发泡行为和力学性能的影响。结果表明，随着CNT含量从不足1.0 %(质量分数，下同)逐渐增加，PP熔体黏度显著增大，热稳定性逐渐提升，即使CNT的加入量仅为0.15 %也会产生团聚现象,但团聚体尺寸较小且与基体结合紧密；微孔发泡注塑样品中泡孔分布不均匀,泡孔尺寸范围在10~70 μm，直径随着CNT含量增加呈现先减小后增大；PP/CNT复合材料微孔发泡成型后，弹性模量、屈服应力下降不大，但断裂伸长率平均提升了近400 %，不同组分发泡样品间力学性能指标变化不大。

关键词: 聚丙烯, 碳纳米管, 微孔注塑, 泡孔结构, 力学性能

Abstract:

The effect of the content of single?walled carbon nanotubes (CNTs) on the rheology, thermal stability, foaming behavior and mechanical properties of microcellular injection?molded polypropylene (PP)/CNTs composites was investigated. The results indicated that the complex viscosity of the composites gradually increased with an increase of CNTs content, and their thermal stability was also improved. The agglomeration occurred with the addition of 0.15 wt % CNTs, and however the size of agglomerates was fairly small and the substrates were tightly bound. The distribution of pores in the microcellular injection?molded samples was nonuniform, and the pore size ranged from 10 to 70 μm. The pore diameter decreased at first and then tended to increase with an increase of CNTs content. The elastic modulus and yield stress were found to decrease slightly after the microcellular foaming process according to the uniaxial tensile test results, and however the elongation at break increased by approximately 400 %. Moreover, there is no significant change in the mechanical properties of the foamed samples.

Key words: polypropylene, carbon nanotubes, microcellular injection molding, pore structure, mechanical property

中图分类号:

TQ320

袁洪跃, 金章勇, 蒋晶, 刘宪虎, 赵振峰. 聚丙烯/碳纳米管微孔注塑发泡行为及力学性能[J]. 中国塑料, 2020, 34(6): 20-26.

Hongyue YUAN, Zhangyong JIN, Jing JIANG, Xianhu LIU, Zhenfeng ZHAO. Microcellular Injection Foaming Behaviors and Mechanical Properties of Polypropylene/Carbon Nanotubes Composites[J]. China Plastics, 2020, 34(6): 20-26.

图/表 10

样品名称	PP/%	CNT/%
PP/0.15 %CNT	99.85	0.15
PP/0.3 %CNT	99.70	0.30
PP/0.45 %CNT	99.55	0.45
PP/0.6 %CNT	99.40	0.60
PP/1.0 %CNT	99.00	1.00

表1 PP/CNT复合材料配方设计

Tab.1 Formula of PP/CNT composites

参数	实体	发泡
喷嘴温度/℃	220	220
模具温度/℃	25	25
注塑速率/cm³·s^-1	21	21
冷却时间/s	30	30
背压/MPa	5	5
SCF 流量/cm³·s^-1	-	5
SCF注塑压力/MPa	-	23
保压压力/MPa	100	-
保压时间/s	1	-

表2 注塑加工参数

Tab.2 Processing parameters

图1 不同含量PP/CNT复合材料脆断面SEM照片

Fig.1 SEM images of the fracture surface of solid PP/CNT composites

图2 PP/CNT 复合材料动态频率扫描曲线

Fig.2 Rheological results from dynamic frequency sweep for PP/CNT composites

图3 PP/CNT复合材料的TG和DTG曲线

Fig.3 TG and DTG curves of PP/CNT composites

图4 PP/CNT复合材料微孔注塑样品泡孔形貌

Fig.4 Pore morphologies of injection molded PP/CNT microcellular

图5 PP/CNT复合材料微孔注塑样品内部泡孔尺寸分布图

Fig.5 Distribution of pore sizes of different injection molded PP/CNT microcellular samples

图6 PP/CNT微孔复合材料平均泡孔尺寸和泡孔密度

Fig.6 Variation of average pore size and pore density of microcellular PP/CNT composites

图7 纯PP和PP/CNT复合材料实心、发泡样品的应力?应变曲线

Fig.7 Stress?strain curves among solid and foamed PP, PP/CNT composites

图8 不同组分PP/CNT的力学性能

Fig.8 Mechanical properties of various PP/CNT composites

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聚丙烯/碳纳米管微孔注塑发泡行为及力学性能

Microcellular Injection Foaming Behaviors and Mechanical Properties of Polypropylene/Carbon Nanotubes Composites

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