Preparation and Characterization of EVA/Nylon Elastomer Microcellular Foaming Materials

doi:10.19491/j.issn.1001-9278.2021.09.001

Abstract

Abstract:

In this paper， ethylene?vinyl?acetate copolymer （EVA）/nylon elastomer compounds were prepared through melt extrusion using the most popular commercial product of PEBAX^{nylon 12. The resultant compounds were foamed to prepare a new type of EVA/nylon 12 microporous foaming materials. The experimental results indicated that the EVA/nylon 12 compounds were foamed successfully through a chemical method， and their foaming materials achieved an improvement in performance in comparison with the traditional EVA ones. The EVA/nylon 12 foaming materials obtained an optimal performance at a nylon 12 content of 5 wt% and a foaming agent content of 1 wt%. This type of nylon elastomer?based foaming materials has superiority in cost and performance， therefore it has a good prospect for the replacement of traditional EVA foamed materials used in shoes.}

Key words: polyamide elastomer, ethylene?vinyl?acetate copolymer, chemical foaming, mechanical property

CLC Number:

TQ323.6

HUANG Guotao, GUI Yuan, LI Yucai, WU Xin, FENG Xinxing, DENG Jianping, WANG Cao, PAN Kai. Preparation and Characterization of EVA/Nylon Elastomer Microcellular Foaming Materials[J]. China Plastics, 2021, 35(9): 1-7.

Figures/Tables 8

Fig.1. Density and foaming ratio of EVA/PEBAX foams

Fig.2. Physical photoes and SEM of EVA/PEBAX foams

Fig.3. Cell size distribution curves of EVA/PEBAX foams

样品	发泡剂含量/%	$D ˉ$ /μm	N _c/个·cm^-3
EVA/5 %PEBAX	1	77.8	5.31×10⁶
EVA/10 % PEBAX		140.1	9.11×10⁵
EVA/15 % PEBAX		101.5	2.41×10⁶
EVA/5 % PEBAX	2	61.5	1.96×10⁷
EVA/10 % PEBAX		63.3	1.98×10⁷
EVA/15 % PEBAX		68.2	1.55×10⁷
EVA/5 % PEBAX	3	63.7	2.60×10⁷
EVA/10 % PEBAX		68.2	2.28×10⁷
EVA/15 % PEBAX		68.5	2.20×10⁷

样品	发泡剂含量/%	$D ˉ$ /μm	N _c/个·cm^-3
EVA/5 %PEBAX	1	77.8	5.31×10⁶
EVA/10 % PEBAX		140.1	9.11×10⁵
EVA/15 % PEBAX		101.5	2.41×10⁶
EVA/5 % PEBAX	2	61.5	1.96×10⁷
EVA/10 % PEBAX		63.3	1.98×10⁷
EVA/15 % PEBAX		68.2	1.55×10⁷
EVA/5 % PEBAX	3	63.7	2.60×10⁷
EVA/10 % PEBAX		68.2	2.28×10⁷
EVA/15 % PEBAX		68.5	2.20×10⁷

Tab.1. Cell diameter and density of EVA/PEBAX foams

Fig.4. Hardness of EVA/PEBAX foams

Fig.5. Histogram of resilience of EVA/PEBAX foams

Fig.6. Histogram of compression recovery rate of EVA/PEBAX foams

样品	AC发泡剂含量/%	拉伸强度 /MPa	断裂伸长率 /%	裤型撕裂强度/N·mm^-1
EVA	1	3.35	305	9.59
EVA/5 %PEBAX		3.64	393	10.23
EVA/10 %PEBAX		3.46	386	9.89
EVA/15 %PEBAX		3.38	367	10.09
EVA	2	2.41	209	3.58
EVA/5 %PEBAX		2.50	399	3.29
EVA/10 %PEBAX		2.16	274	3.16
EVA/15 %PEBAX		2.22	344	3.63
EVA	3	1.91	204	1.68
EVA/5 %PEBAX		1.81	232	2.25
EVA/10 %PEBAX		1.64	232	1.86
EVA/15 %PEBAX		1.49	246	2.24

Tab.2. Mechanical properties of EVA/PEBAX foams

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