相结构对PBE/EVA共混物CO2釜压发泡材料结构的影响

doi:10.19491/j.issn.1001-9278.2020.09.001

中国塑料 ›› 2020, Vol. 34 ›› Issue (9): 1-8.DOI: 10.19491/j.issn.1001-9278.2020.09.001

• 材料与性能 • 下一篇

相结构对PBE/EVA共混物CO₂釜压发泡材料结构的影响

李聂鑫¹, 李明罡²(), 唐涛², 王轶¹, 邢海平²

^1.延边大学理学院化学系，吉林延吉 133002
^2.中国科学院长春应用化学研究所高分子物理与化学国家重点实验室，长春 130022

收稿日期:2020-04-08 出版日期:2020-09-26 发布日期:2020-09-25
基金资助:
国家自然科学基金(51573179);吉林省科技计划(20170203006GX)

Effect of Phase Structure on Foam Structure of PBE/EVA Composite under CO₂ Batch Foaming

LI Niexin¹, LI Minggang²(), TANG Tao², WANG Yi¹, XING Haiping²

^1.Department of Chemistry, School of Science, Yanbian University, Yanji 133002, China
^2.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received:2020-04-08 Online:2020-09-26 Published:2020-09-25
Contact: LI Minggang E-mail:lmg@ciac.ac.cn

摘要/Abstract

摘要：

以熔融共混的方法制备了具有不同相结构的丙烯基弹性体/乙烯?醋酸乙烯共聚物（PBE/EVA）共混物，并进行了CO₂釜压发泡。通过差示扫描量热法（DSC）、动态热力学分析（DMA）、扫描电子显微镜（SEM）等方法研究了PBE/EVA共混物相结构对其发泡后材料泡孔结构的影响。结果表明，当共混物相结构为海岛相结构时得到常规的蜂窝状泡沫；而当相结构为双连续相结构时，获得了一种网状的开孔结构，这主要归因于两相组分黏度的差异。

关键词: 丙烯基弹性体, 乙烯-醋酸乙烯共聚物, 共混, 双连续相结构, 开孔泡沫

Abstract:

In this paper, the propylene?based elastomer/ethylene?vinyl acetate copolymer (PBE/EVA) blends with different phase structures are prepared by melt blending and then foamed under CO₂ batch foaming. The effect of PBE/EVA phase structure on the foam cell structure was investigated by differential scanning calorimetry, dynamic mechanical analysis and scanning electron microscopy. When the phase structure of blends presented the “see?island” phase, a conventional honeycomb?foamed structure was obtained. An open?cell network structures was achieved when the blends possessed a bicontinuous phase structure. The formation of such a special cell structure is ascribed to the difference in viscosity between the two components in the bicontinuous phase structure. This study helps to strengthen the understanding of the relationship between polymer phase structure and foaming behavior and therefore provides an important reference for preparation of polymer foams with specific open cells.

Key words: propylene?based elastomer, ethylene-vinyl acetate copolymer, blending, bicontinuous phase structure, open?cell foam

中图分类号:

TQ328.06

李聂鑫, 李明罡, 唐涛, 王轶, 邢海平. 相结构对PBE/EVA共混物CO₂釜压发泡材料结构的影响[J]. 中国塑料, 2020, 34(9): 1-8.

LI Niexin, LI Minggang, TANG Tao, WANG Yi, XING Haiping. Effect of Phase Structure on Foam Structure of PBE/EVA Composite under CO₂ Batch Foaming[J]. China Plastics, 2020, 34(9): 1-8.

图/表 10

图1 PBE/EVA共混物脆断面的SEM照片

Fig.1 SEM images of the fractured surfaces of PBE/EVA blends

图2 纯PBE、EVA和PBE/EVA共混物的DSC曲线

Fig.2 DSC curves of pure PBE and EVA and PBE/EVA blends

图3 纯PBE、EVA及PBE/EVA共混物泡沫材料的SEM照片（发泡温度为87 ℃，压力为5.0 MPa，平衡时间为20 min）

Fig.3 SEM images of pure PBE and EVA and PBE/EVA blend foams

样品	泡孔直径D_c/ μm	泡孔密度N/ ×10⁵个·cm^-3	体积膨胀倍率
PBE	138.1±54.3	5.6	3.25
8PBE/2EVA	181.5±61.7	8.6	5.99
5PBE/5EVA	158.8±45.5	6.4	2.92
2PBE/8EVA	244.8±68.2	3.6	4.34
EVA	—	—	1.13

表1 纯PBE、EVA及PBE/EVA共混物泡沫的泡孔参数

Tab. 1 Cell data of pure PBE and EVA and PBE/EVA blend foams

图4 5PBE/5EVA泡沫样品的EDS能谱图

Fig.4 EDS analysis of 5PBE/5EVA foam samples

图5 PBE和EVA的DMA曲线

Fig.5 DMA curves of PBE and EVA

图6 温度对5PBE/5EVA泡沫泡孔结构的影响

Fig.6 Influence of temperature on the bubble structure of 5PBE/5EVA foam

图7 EVA?T和5PBE/5EVA?T泡沫的SEM照片

Fig.7 SEM images of EVA?T and 5PBE/5EVA?T foams

图8 不同饱和时间下5PBE/5EVA未发泡样品相结构及其发泡样品的泡孔结构SEM照片

Fig.8 SEM images of the phase structure of 5PBE/5EVA unfoamed samples and the bubble structure of the foamed samples at different saturation time

图9 5PBE/5EVA共混物泡沫的网络开孔结构形成机理

Fig.9 Formation mechanism of network open?cell structure of 5PBE/5EVA blend foam

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相结构对PBE/EVA共混物CO₂釜压发泡材料结构的影响

Effect of Phase Structure on Foam Structure of PBE/EVA Composite under CO₂ Batch Foaming

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