Preparation and characterization of EVA foaming materials modified with thermoplastic polyamide elastomer

doi:10.19491/j.issn.1001-9278.2022.04.002

Abstract

Abstract:

This paper reported a study on the effect of addition amount of foaming agent on the ethylene?vinyl acetate copolymer （EVA） foaming materials modified with thermoplastic polyamide elastomer （TPAE）， and the foaming performance and mechanical properties of the resulting EVA/TPAE foaming materials were also investigated at a fixed mass ratio of EVA to TPAE of 100 to 5. The results indicated that the foaming materials foamed more fully at a mass ratio of foaming material to foaming agent of 100 to 3， leading to a uniform cell size. The obtained foaming materials could meet the requirement of the shoe materials for mechanical strength. At this mass ratio， the foaming materials exhibited good comprehensive performance， suggesting a good application prospect in the shoe market.

Key words: thermoplastic polyamide elastomer, ethylene?vinyl acetate copolymer, modification, cell structure, mechanical property

CLC Number:

TQ323.6

LI Suyuan, LIU Huipeng, GONG Shun, HUANG Guotao, LI Yucai, WU Xin, DENG Jianping, PAN Kai. Preparation and characterization of EVA foaming materials modified with thermoplastic polyamide elastomer[J]. China Plastics, 2022, 36(4): 6-14.

Figures/Tables 17

样品编号	EVA含量/份	TPAE含量/份
EVA/TPAE （5）	100	5
EVA/TPAE （10）	100	10
EVA/TPAE （15）	100	15

Tab.1. Formulation of EVA/TPAE blends

样品编号	EVA/TPAE含量/份	AC含量/份	发泡助剂含量/份
EVA/TPAE （5）⁃AC （1）	100 ［EVA/TPAE （5）］	1	9
EVA/TPAE （5）⁃AC （2）	100 ［EVA/TPAE （5）］	2	9
EVA/TPAE （5）⁃AC （3）	100 ［EVA/TPAE （5）］	3	9
EVA/TPAE （10）⁃AC （3）	100 ［EVA/TPAE （10）］	3	9
EVA/TPAE （15）⁃AC （3）	100 ［EVA/TPAE （15）］	3	9

Tab.2. Formulation of EVA/TPAE foaming composites

Fig.1. SEM and cell sizes distribution diagrams of EVA/TPAE （5）?AC （Y）

样品	发泡剂用量/份	$D ¯$ /µm	$N c$ /个·cm^-3
EVA/TPAE （5）⁃AC （1）	1	71	6.82×10⁶
EVA/TPAE （5）⁃AC （2）	2	60	2.22×10⁷
EVA/TPAE （5）⁃AC （3）	3	55	3.44×10⁷

样品	发泡剂用量/份	$D ¯$ /µm	$N c$ /个·cm^-3
EVA/TPAE （5）⁃AC （1）	1	71	6.82×10⁶
EVA/TPAE （5）⁃AC （2）	2	60	2.22×10⁷
EVA/TPAE （5）⁃AC （3）	3	55	3.44×10⁷

Tab.3. Average cell diameter and cell density of EVA/TPAE （5）?AC （Y）

Fig.2. Density and expansion ratio curve of EVA/TPAE （5）?AC （Y）

Fig.3. Hardness curve of EVA/TPAE （5）?AC （Y）

Fig.4. Histogram of resilience and compression recovery performance of EVA/TPAE （5）?AC （Y）

Fig.5. Histogram of tensile strength and elongation at break of EVA/TPAE （5）?AC （Y）

Fig.6. Histogram of pants tear strength of EVA/TPAE （5）?AC （Y）

Fig.7. SEM and cell sizes distribution diagrams of EVA/TPAE （X）?AC （3）

样品

发泡剂

用量/份

D ¯

/µm

N c

样品

发泡剂

用量/份

D ¯

/µm

N c

/个·cm^-3

EVA/TPAE （5）⁃AC （3）

3.44×10⁷

EVA/TPAE （10）⁃AC （3）

2.69×10⁷

EVA/TPAE （15）⁃AC （3）

2.29×10⁷

Tab.4. Average cell diameter and cell density of EVA/TPAE （X）?AC （3）

Fig.8. SEM of EVA/TPAE （X） internal cross section

Fig.9. Density and expansion ratio curve of EVA/TPAE （X）?AC （3）

Fig.10. Hardness curve of EVA/TPAE （X）?AC （3）

Fig.11. Resilience and compression recovery performance curve of EVA/TPAE （X）?AC （3）

Fig.12. Tensile strength and elongation at break curve of EVA/TPAE （X）?AC （3）

Fig.13. Pants tear strength curve of EVA/TPAE （X）?AC （3）

References 28

1	JIN F L， ZHAO M， PARK M， et al. Recent Trends of foaming in polymer processing： a review［J］. Polymers， 2019， 11（6）： 953.
2	CHEN L， RENDE D， SCHADLER L S， et al. Polymer nanocomposite foams［J］. Journal of Materials Chemistry A， 2013， 1（12）： 3 837⁃3 850.
3	LEE L J， ZENG C， CAO X， et al. Polymer nanocomposite foams［J］. Composites Science and Technology， 2005， 65（15/16）： 2 344⁃2 363.
4	OKOLIEOCHA C， RAPS D， SUBRAMANIAM K， et al. Microcellular to nanocellular polymer foams： progress （2004–2015） and future directions–a review［J］. European Polymer Journal， 2015， 73： 500⁃519.
5	ANTUNES M， VELASCO J I. Multifunctional polymer foams with carbon nanoparticles［J］. Progress in Polymer Science， 2014， 39（3）： 486⁃509.
6	RIZVI A， CHU R K M， LEE J H， et al. Superhydrophobic and oleophilic open⁃cell foams from fibrillar blends of polypropylene and polytetrafluoroethylene［J］. ACS Applied Materials & Interfaces， 2014， 6（23）： 21 131⁃21 140.
7	LI S， JIANG S， GONG S， et al. Preparation methods， performance improvement strategies， and typical applications of polyamide foams［J］. Industrial & Engineering Chemistry Research， 2021.
8	ZHANG H， ZHANG G， GAO Q， et al. Multifunctional microcellular PVDF/Ni⁃chains composite foams with enhanced electromagnetic interference shielding and superior thermal insulation performance［J］. Chemical Engineering Journal， 2020， 379： 122304.
9	CHEN L， OZISIK R， SCHADLER L S. The influence of carbon nanotube aspect ratio on the foam morphology of MWNT/PMMA nanocomposite foams［J］. Polymer， 2010， 51（11）： 2 368⁃2 375.
10	GIRARD O， MORIN J B， RYU J H， et al. Custom foot orthoses improve performance， but do not modify the biomechanical manifestation of fatigue， during repeated treadmill sprints［J］. European Journal of Applied Physiology， 2020， 120（9）： 2 037⁃2 045.
11	AGUINALDO A， MAHAR A. Impact loading in running shoes with cushioning column systems［J］. Journal of Applied Biomechanics， 2003， 19（4）： 353⁃360.
12	EVEN⁃TZUR N， WEISZ E， HIRSCH⁃FALK Y， et al. Role of EVA viscoelastic properties in the protective performance of a sport shoe： computational studies［J］. Bio⁃medical Materials and Engineering， 2006， 16（5）： 289⁃299.
13	VERDEJO R， MILLS N J. Heel–shoe interactions and the durability of EVA foam running⁃shoe midsoles［J］. Journal of Biomechanics， 2004， 37（9）： 1 379⁃1 386.
14	HUANG G， LI S， LI Y， et al. Preparation and characterization of microcellular foamed thermoplastic polyamide elastomer composite consisting of EVA/TPAE1012［J］. Journal of Applied Polymer Science， 2021， 138（37）： 50952.
15	YU C T， LAI C C， WANG F M， et al. Fabrication of thermoplastic polyurethane （TPU）/thermoplastic amide elastomer （TPAE） composite foams with supercritical carbon dioxide and their mechanical properties［J］. Journal of Manufacturing Processes， 2019， 48： 127⁃136.
16	KIM M S， PARK C C， CHOWDHURY S R， et al. Physical properties of ethylene vinyl acetate copolymer （EVA）/natural rubber （NR） blend based foam［J］. Journal of Applied Polymer Science， 2004， 94（5）： 2 212⁃2 216.
17	SIPAUT C S， HALIM H A， JAFARZADEH M. Processing and properties of an ethylene–vinyl acetate blend foam incorporating ethylene–vinyl acetate and polyurethane waste foams［J］. Journal of Applied Polymer Science， 2017， 134（16）.
18	ZHANG Z X， ZHANG T， WANG D， et al. Physicomechanical， friction， and abrasion properties of EVA/PU blend foams foamed by supercritical nitrogen［J］. Polymer Engineering & Science， 2018， 58（5）： 673⁃682.
19	BARZEGARI M R， HOSSIENY N， JAHANI D， et al. Characterization of hard⁃segment crystalline phase of poly （ether⁃block⁃amide）（PEBAX^®） thermoplastic elastomers in the presence of supercritical CO₂ and its impact on foams［J］. Polymer， 2017， 114： 15⁃27.
20	SHETH J P， XU J， WILKES G L. Solid state structure⁃property behavior of semicrystalline poly （ether⁃block⁃amide） PEBAX^® thermoplastic elastomers［J］. Polymer， 2003， 44（3）： 743⁃756.
21	KARODE N， FITZHENRY L， POUDEL A， et al. Performance enhancement of PEBAX using supercritical fluid extrusion for biomedical applications［C］//Proceedings of the Conference： SPE ANTEC™ Indianapolis. 2016： 1 377⁃1 382.
22	LU P， ZHAO Z Y， XU B R， et al. A novel inherently flame⁃retardant thermoplastic polyamide elastomer［J］. Chemical Engineering Journal， 2020， 379： 122278.
23	赵丽娜，龚惠勤，杜影. 聚酰胺弹性体的合成与前景［J］. 石化技术， 2016， 23（4）： 1⁃3.
	ZHAO L N， GONG H Q， DU Y. Synthesis and prospects of thermoplastic polyamide elastomer［J］. Petrochemical Industry Technology， 2016， 23（4）： 1⁃3.
24	许冬峰，冯新星，张卫东，等. 长碳链聚酰胺1012弹性体的合成与表征［J］. 中国塑料， 2019， 33（3）： 17⁃21， 27.
	XU D F， FENG X X， ZHANG W D， et al. Synthesis and Characterization of long⁃carbon⁃chain polyamide⁃1012⁃based elastomer［J］. China Plastics， 2019， 33（3）： 17⁃21， 27.
25	黄国桃，桂源，李玉才，等. EVA/聚酰胺弹性体微孔发泡材料的制备与性能表征［J］. 中国塑料， 2021， 35（9）： 1⁃7.
	HUANG G T， GUI Y， LI Y C， et al. Preparation and characterization of EVA/nylon elastomer microcellular foaming materials［J］. China Plastics， 2021， 35（9）： 1⁃7.
26	SAUCEAU M， FAGES J， COMMON A， et al. New challenges in polymer foaming： a review of extrusion processes assisted by supercritical carbon dioxide［J］. Progress in Polymer Science， 2011， 36（6）： 749⁃766.
27	王臣臣，宋立夫，白楠，等. POE⁃g⁃MAH含量对POE/EPDM复合材料相容性、结构及力学性能的影响［J］. 塑料工业， 2021， 49（12）： 56⁃61.
	WANG C C， SONG L F， BAI N， et al. Effects of POE⁃g⁃MAH contents on the compatibility，structure and mechanical properties of POE/EPDM composites［J］. China Plastics Industry， 2021， 49（12）： 56⁃61.
28	SU B， ZHOU Y G， DONG B B， et al. Effect of compatibility on the foaming behavior of injection molded polypropylene and polycarbonate blend parts［J］. Polymers， 2019， 11（2）： 300.

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