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以EVA为基体树脂、偶氮二甲酰胺(ADC)为发泡剂、聚酰胺弹性体(TPAE)为改性树脂,采用化学发泡法和辐照交联工艺成功制备了EVA/TPAE复合发泡材料,研究了EVA/TPAE体系的熔体流动速率、热性能以及EVA/TPAE发泡体系的力学性能、热导率和泡孔结构等。结果表明,TPAE能提高EVA/TPAE复合材料的熔体流动速率,降低其复合材料的相对结晶度。随着TPAE含量的增加,EVA/TPAE发泡体系的拉伸强度、断裂伸长率、撕裂强度、回弹率均呈现先升高后下降的趋势,而表观密度、硬度、热导率呈先下降后升高的趋势;当TPAE的含量为10%时,EVA/TPAE发泡体系的断裂伸长率、回弹率均达到最大值,分别为433.8%和59.1%,与纯EVA发泡体系相比,分别提高了7.9%和28.2%。EVA/TPAE复合发泡材料有望应用于婴童爬爬垫。 相似文献
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综述了发泡热塑性聚氨酯(ETPU)和乙烯-乙酸乙烯酯共聚物(EVA)的研究进展以及作为运动鞋中底材料的应用情况.调整原料配比可以生产不同密度和不同功能的的发泡材料,通过改进成型方法可使采用EVA和ETPU制造的运动鞋中底成本更低. 相似文献
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采用化学发泡法制备以聚乙烯-醋酸乙烯酯(EVA)为基体,不同含量乙烯-辛烯共聚物(POE)及马来酸酐(MAH)接枝的乙烯-辛烯共聚物的复合发泡材料,并研究POE对EVA发泡材料发泡行为及力学性能的影响。结果表明:随着POE含量的增加,一方面增加了发泡材料的弹性,压缩永久变形降低,但拉伸及撕裂强度降低,另一方面减小了泡孔直径,增加泡孔密度,POE在质量分数30%的时候性能最好,泡孔直径是79.2μm。而随着POE-g-MAH含量的增加,一方面显著提高了发泡材料的拉伸、撕裂强度及耐磨强度,另一方面进一步降低了泡孔直径,增大了泡孔密度。接枝马来酸酐的POE质量分数在30%~40%发泡材料的性能最好,泡孔直径为68.1μm。 相似文献
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以热塑性淀粉(TPS)为成炭剂与聚磷酸铵(APP)、可膨胀石墨(EG)复配组成膨胀型阻燃剂,通过熔融密炼、开炼塑化、硫化发泡制备了热塑性淀粉/乙烯-醋酸乙烯酯共聚物(TPS/EVA)泡沫复合材料,探讨了TPS用量对泡沫复合材料阻燃性能、力学性能的影响。结果表明,TPS的加入显著提高了TPS/EVA泡沫复合材料阻燃性能,可起到良好的成炭作用;TPS/EVA泡沫复合材料的拉伸强度、断裂伸长率以及撕裂强度随着TPS用量的增加呈现先增大后减小的趋势,相对密度则是小幅度上升。当TPS用量为6%时,TPS/EVA泡沫复合材料综合性能最好,其LOI可达26.5%且UL-94为V-0级,拉伸强度、断裂伸长率、撕裂强度以及相对密度可达2.395 MPa、177.48%、10.59 N·mm-1、0.21452。 相似文献
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Improving viscoelasticity and rebound resilience of crosslinked low‐density polyethylene foam by blending with ethylene vinyl acetate and polyethylene‐octene elastomer
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To obtain high‐rebound resilience of crosslinking low‐density polyethylene (LDPE) foam and decrease the foam density at the same content of foaming agent, the melt viscoelasticity of LDPE with different compositions (ethylene vinyl acetate [EVA], polyethylene‐octene elastomer, and crosslinking agent) was investigated by dynamic rheology test. Then, LDPE/EVA/(polyethylene‐octene elastomer) foams with different composition ratios were produced by a continuous foaming process and investigated by the rebound resilience test. The results show that the melt viscoelasticity behavior of LDPE and its blends in the molten state possessed more melt elasticity behavior after the crosslinking was introduced. Meanwhile, the rebound resilience of LDPE foam was increased 54% at the lower foam density (0.031 g/cm3). It could meet the requirements of sports mats for high‐rebound resilience (>50%) and decrease the material cost when EVA was introduced into the foaming system. J. VINYL ADDIT. TECHNOL., 22:61–71, 2016. © 2014 Society of Plastics Engineers 相似文献
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Guotao Huang Suyuan Li Yucai Li Xin Wu Xinxing Feng Yuan Gui Jianping Deng Cao Wang Kai Pan 《应用聚合物科学杂志》2021,138(37):50952
Thermoplastic polyamide elastomer (TPAE) is a kind of high-performance elastomers prepared from nylon hard segments and polyether or polyester soft segments. The hard segments endow TPAE with excellent mechanical properties, while the soft segments provide the desired elasticity. Therefore, the development of TPAE as a high-performance foam material has broad application prospects. In this work, ethylene-vinyl acetate copolymer/polyamide-1012 elastomer (EVA/TPAE1012) composite materials with different compositions were prepared, using ethylene-vinyl acetate /maleic anhydride graft copolymer (EVA-g-MAH) as compatibilizer. Then, EVA/TPAE foamed materials were fabricated by chemical foaming method and batch foaming process, with azodicarbonamide as blowing agent. The resulting composite foams were tested in terms of density, cell properties hardness, resilience, compression recovery, and mechanical strength. The EVA/TPAE1012 foam has a low density (0.14 g cm−3), small cell size (approximately 62.1 μm), and a high cell density (3.08 × 107 cells cm−3). Compared with pure EVA foam, the composite foam not only has an increase in specific strength, resilience and tearing strength, but also has good toughness, which greatly improves the resulting foams' expansion ratio and elongation at break. 相似文献
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聚氨酯泡沫材料的性能研究 总被引:3,自引:0,他引:3
聚氨酯泡沫具有多孔性、相对密度小、比强度高等特点,根据所用原料的不同和配方的变化可制成阻尼减震性能优异的材料。为了满足铝型材内填充材料的阻尼减震的要求,通过改变原料的组成和配比,制备了一种密度低、阻尼性能优异的聚氨酯泡沫材料。研究了发泡剂、N220和环氧树脂的含量对泡沫材料性能的影响,结果表明调节发泡剂用量可以改变材料的密度和粘接性能,N220和环氧树脂的加入可以提高聚氨酯泡沫的阻尼性能,所制得的聚氨酯泡沫材料可以满足铝型材填充材料的要求。 相似文献
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本文以BIH40作为发泡剂,使用注塑方法化学发泡成型制备了PP、LDPE发泡材料,探讨了发泡剂含量对PP和LDPE发泡制品的密度、拉伸强度、缺口冲击强度等力学性能的影响,并用扫描电子显微镜(SEM)观测了断面的泡孔形貌。实验结果表明,随着发泡剂含量的增加,发泡试样的拉伸强度、冲击强度、断裂伸长率和密度等与未发泡试样相比总体呈现下降趋势,LDPE的断裂伸长率在发泡剂含量为1.0%(重量百分比wt.)时较其他发泡组分有所增加,PP的冲击强度在发泡剂含量为0.5%(重量百分比wt.)时与其他发泡组分相比有所提高。综合实验测试结果显示,发泡剂含量在1.0%(重量百分比wt.)时所得到的发泡制品力学性能较好。 相似文献
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选用不同种类含锌化合物对ADC发泡剂的分解温度、分解速率、发气量等热解因素的影响进行了规律性研究。采用DSC测定ADC发泡剂热效应及含锌化合物对其分解热焓的影响。最后筛选出满足EVA加工条件的改性ADC发泡剂,对其模压发泡进行力学特性及泡孔结构分析。研究表明:含锌化合物对ADC发泡剂的活化作用是一种催化作用,并且通过Lewis酸碱理论分析了活化程度的不同,其中醋酸锌对ADC发泡剂的活化程度最为明显,但是氧化锌改性后的ADC发泡剂加入到EVA基体中的制得的泡沫材料的力学性能和泡孔结构更优异。 相似文献
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以化学发泡注塑成型技术为主线,在二次开模条件下制备微发泡聚苯乙烯(PS)及微发泡聚丙烯(PP);通过流变性、加工性分析了树脂本征特性对PS及PP发泡行为的影响。结果表明:本征特性对气泡的长大和定型过程、气体扩散具有明显的影响;熔体强度越高的材料,阻碍泡孔长大的趋势越明显,所得到的泡孔越细小而均匀;PS具有合适的熔体强度和熔体流动速率(MFR),发泡质量较理想,泡孔直径和泡孔密度分别为41.4μm、8.7×106个/cm3;PP(K9026)熔体强度较低,而熔体流动速率过大,发泡质量明显降低,泡孔直径和泡孔密度分别为65.94μm、5.82×105个/cm3。 相似文献
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The role of nanofillers on (natural rubber)/(ethylene vinyl acetate)/clay nanocomposite in blending and foaming
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Natinee Lopattananon Juthapat Julyanon Abdulhakim Masa Azizon Kaesaman Chanchai Thongpin Tadamoto Sakai 《乙烯基与添加剂工艺杂志》2015,21(2):134-146
Nanocomposite foams were fabricated from 60/40 wt% ethylene vinyl acetate (EVA)/natural rubber (NR) blends by using azodicarbonamide as a blowing agent. Two different nanofillers (sodium montmorillonite and organoclay) were employed to study their effects on foam properties. The results were also compared with conventional (china clay)‐filled foams. Transmission electron microscopy, X‐ray diffraction, scanning electron microscopy, and three‐dimensional Microfocus X‐ray computed tomography scanning analysis were performed to characterize the EVA/NR blend morphology and foam structures. The results revealed that the nanofiller acted as a blend compatibilizer. Sodium montmorillonite was more effective in compatibilization, generating better phase‐separated EVA/NR blend morphology and improving foam structure. Higher filler loading increased the specific tensile strength of rubber foams. The rubber nanocomposite foam showed superior specific tensile strength to the conventional rubber composite foam. The elastic recovery and compressive strength of the nanocomposite foams decreased with increasing filler content, whereas the opposite trend was observed for the conventional composite foams with china clay. The thermal conductivity measurement indicated that the nanofiller had better beneficial effect on thermal insulation over china clay filler. From the present study, the nanofillers played an important role in obtaining better blend morphology as compatibilizer, rather than the nucleating agent and the nanofiller content of 5 phr (parts by weight per hundred parts of rubber) was recommended for the production of EVA/NR nanocomposite foams. J. VINYL ADDIT. TECHNOL., 21:134–146, 2015. © 2014 Society of Plastics Engineers 相似文献
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In this work, low density polyethylene and its blend with poly (ethylene vinyl acetate) (LDPE/EVA) (80/20) were mixed with
different concentration of Azodicarbonamide (ACA) as a foaming agent. The specimens were crosslinked by electron beam irradiation
in presence of 1,6-Hexandiol diacrylate (HDDA). The foam structure was obtained by heating the crosslinked sheets at 225 °C.
The effect of ACA content and irradiation dose on the gel percent, tensile strength, cell density, and thermal stabilities
was investigated. The results showed clearly that the increasing of ACA content reduces the stress and strain at break and
increase the gel content. On the other hand, the foaming degree increases with increasing the ACA content and decreases with
increasing irradiation dose. 相似文献
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