E-TMB中弹性体含量对HDPE/E-TMB共混物性能的影响

以高密度聚乙烯(HDPE)为基体树脂,(乙烯/丙烯)共聚物和(苯乙烯/丁二烯)共聚物为增韧剂研制出5种弹性体含量不同的聚乙烯增韧母料(E-TMB),将E-TMB与HDPE热机械共混制得弹性体总含量均为6.3%的5种HDPE/E-TMB共混物,研究了E-TMB中弹性体含量对共混物力学性能和热性能的影响。结果表明,当E-TMB中弹性体含量为44%时,共混物的综合力学性能最好,悬臂梁缺口冲击强度是HDPE的5.65倍,拉伸屈服强度和弯曲弹性模量保留率分别为90.8%和73.7%;共混物的熔点和热分解温度随E-TMB中弹性体含量的增加而升高,结晶温度随E-TMB中弹性体含量的增加而降低。     

两类增韧HDPE的力学性能及熔体流动性

以高密度聚乙烯(HDPE)为基体树脂、(乙烯／丙烯)共聚物和丁苯橡胶为增韧剂制得增韧母料(E-TMB)。分别采用将E-TMB与HDPE热机械共混和将(乙烯／丙烯)共聚物、丁苯橡胶与HDPE简单共混的方法制备了HDPE／E-TMB及HDPE／弹性体两类增韧HDPE。结果表明,HDPE／E-TMB的悬臂梁缺口冲击强度的提高幅度、拉伸屈服应力保持率均显著优于HDPE／弹性体,二者的弯曲弹性模量保持率基本相同;HDPE／E-TMB的熔体流动速率比HDPE／弹性体的小,但仍适宜于注射成型和挤出成型。     

振动参数对HDPE注塑件力学性能的影响

采用自制的振动注射试验装置注射成型高密度聚乙烯(HDPE)制件,探讨振动频率、振动压力幅度对HDPE注塑件屈服强度、断裂伸长率、拉伸弹性模量和冲击强度的影响。结果表明,振动使得注塑件的综合力学性能得到改善;不同温度下振动频率或振动压力幅度对注塑件力学性能的影响程度不同,但其影响趋势是一致的。     

粉煤灰空心玻璃微珠对HDPE的力学性能和热稳定性的影响

研究了粉煤灰空心玻璃微珠（HGB）粒径对高密度聚乙烯（HDPE）力学性能的影响。结果表明：粒径小的HGB填充HDPE具有较高的拉伸强度、断裂伸长率、弯曲强度和冲击强度,而且HGB的加入对HDPE的热稳定性影响不明显。     

高密度聚乙烯户外自然老化的力学性能研究

对高密度聚乙烯(HDPE)在济南、万宁、西双版纳、漠河四地区的户外自然老化样品进行研究,考察了其缺口冲击强度、弯曲强度、拉伸强度及断裂伸长率等力学性能。     

HDPE/木粉复合材料的性能研究

研究了不同种类的增容剂对高密度聚乙烯(HDPE)木/粉复合材料性能的影响,并研究了增容剂含量、木粉含量对复合材料力学性能及形态结构的影响。结果表明,HDPE木/粉复合材料的拉伸强度、弯曲强度均随马来酸酐接枝HDPE(HDPE-g-MAH)含量的增加而增大;复合材料的缺口冲击强度随甲基丙烯酸缩水甘油酯接枝低密度聚乙烯的增加而提高;复合材料的拉伸强度、弯曲强度随木粉含量的增加而增大;而缺口冲击强度则随木粉含量的增加呈降低趋势。     

MAH原位接枝HDPE及其对HDPE/N-PCB复合材料力学性能的影响

将马来酸酐(MAH)、过氧化二异丙苯(DCP)、苯乙烯(St)、高密度聚乙烯(HDPE)和废印刷电路板非金属粉末(N-PCB)直接反应挤出,制备了HDPE/N-PCB复合材料,并研究了MAH用量对HDPE/N-PCB复合材料力学性能影响。对HDPE/N-PCB复合材料抽提残留物的红外分析结果表明,在HDPE/N-PCB复合材料中加入DCP、St、MAH之后,通过DCP引发HDPE原位接枝MAH,并随即与N-PCB粉末表面的羟基反应而起到了桥联作用,可改善HDPE基体与N-PCB粉末两相的界面作用。MAH反应增容后的HDPE/N-PCB复合材料与增容前相比,其拉伸强度、弯曲强度、缺口冲击强度及断裂伸长率的最大增幅分别为36%、12%、208%和262%。     

HDPE/改性蛭石复合材料的制备与气体阻隔性能研究

利用改性后的蛭石作为填充材料,通过熔融共混法制备了高密度聚乙烯(HDPE)/改性蛭石复合材料。研究了改性蛭石的添加量对复合材料热稳定性能、结晶性能、力学性能和氧气阻隔性能的影响。结果表明,相比纯HDPE,HDPE/改性蛭石复合材料仍能保持较好的拉伸强度,当含量为1%时拉伸强度为24.1 MPa,断裂伸长率先提高后下降,当含量为0.5%时断裂伸长率达到最高为535%;改性蛭石的加入提升了材料的韧性,当改性蛭石含量为1%时材料缺口冲击强度达到最高为45.8 kJ/m²;HDPE/改性蛭石复合材料的氧气阻隔性能明显提升,当改性蛭石含量为1%时材料的氧气阻隔性能达到最优,氧气渗透系数为6.9×10^-15 cm³·cm/(cm²·s·Pa)。     

渔船船体用HDPE材料的耐久性能

通过调整光辐照强度、海水温度、浸泡时间及冻融循环等因素,研究了其对渔船船体用HDPE力学性能的影响。结果表明,光辐照强度越高,HDPE性能劣化越严重,当强度为1 600 W/m²时的辐照1 920 h后,HDPE的拉伸强度和弯曲强度分别降低了25.3%和23.7%;热氧作用对HDPE力学性能的整体影响较小,在温度为80℃条件下老化1 920 h后,HDPE的拉伸强度和弯曲强度分别下降了8.5%和5.7%,而在常温条件下,HDPE的力学性能基本无影响;海水浸泡作用使HDPE发生轻微的吸湿现象,最大吸湿率仅为0.7%,随着海水浸泡时间的延长,材料的力学性能出现明显降低,拉伸强度和弯曲强度的最大降低幅度均达到了15%,而海水的盐度对HDPE的吸湿率及力学性能影响均较小;海水冻融循环作用使HDPE的力学性能出现小幅度增大,材料的耐冻融能力较强。     

室温自交联高密度聚乙烯的研究

研究了高密度聚乙烯(HDPE)的自交联行为和在不同条件下自交联效果及其对结构和性能的影响.结果表明,HDPE可以实现自交联,在自交联40 d后凝胶率达到57.9%,材料的拉伸力学性能也随之有一定程度的改善;HDPE自交联40 d后,其拉伸屈服强度从初始的18.49 MPa提高到25.74 MPa,增长了39.2%,相应的断裂伸长率由568.53%降低至27.82%,拉伸弹性模量增长25%.     

紫外辐照官能化HDPE的研究

本文通过红引光谱,与水的接触角以及力学性能测试等研究了空气中紫外辐照ＨＤＰＥ官能化及其增容作用。表明,紫外辐照能有效地在ＨＤＰＥ分子链上引入Ｃ≡Ｏ基团,随辐照时间增加,ｕＨＤＰＥ的Ｃ≡Ｏ基团含量南昌市,与水的接触角一上降,在一定条件下制得的ｕＨＤＰＥ对ＨＤＰＥ／ＰＣ共混体系有增容作用,其共涨物的拉伸强度、断裂伸长率和缺口冲击强度比未增容的都有提高。     

弹性体对HDPE/E-TMB共混物性能的影响

用自制增韧母料（E-TMB）与高密度聚乙烯（HDPE）热机械共混分别制得HDPE／E-TMB的J系列共混物和S系列共混物,研究了E—TMB中乙丙弹性体M与丁苯弹性体N质量比对共混物力学性能及熔体质量流动速率（MFR）的影响。结果表明,共混物熔体的MFR随母料中N用量的增加逐渐减小;当E-TMB中m（M）／m（N）=80／20时,J类共混物的综合力学性能最好;当m（M）／m（N）=0／100时,s类共混物的力学性能最好。     

SCM晶须/高密度聚乙烯复合材料力学性能的研究

研究了硅钙镁晶须(SCM晶须)／高密度聚乙烯(HDPE)复合材料的力学性能。实验结果表明：随着SCM晶须用量的增加，复合材料的拉伸强度、弯曲强度、弯曲模量显著提高而缺口冲击强度稍有降低；利用改性聚乙烯作增容剂，可以改善基体树脂与SCM晶须的界面结合性，有助于力学性能的提高。     

Studies on high density polyethylene (HDPE) functionalized by ultraviolet irradiation and its application

The structure and properties of high density polyethylene (HDPE) functionalized by ultraviolet irradiation at different light intensities in air were studied by electron analysis, FTIR spectroscopy, contact angle with water, differential scanning calorimetry and mechanical properties measurement. The results show that oxygen‐containing groups such as C?O, C—O and C(?O)O were introduced onto the molecular chain of HDPE following irradiation, and the rate and efficiency of HDPE functionalization increased with enhancement of irradiation intensity. After irradiation, the melting temperature, contact angle with water and notched impact strength of HDPE decreased, the degree of crystallinity increased, and their variation amplitude increased with irradiation intensity. Compared with HDPE, the yield strength of HDPE irradiated at lower light intensity (32 W m^?2 and 45 W m^?2) increases monotonically with irradiation time, and the yield strength of HDPE irradiated at higher light intensity (78 W m^?2) increases up to 48 h and then decreased with further increase in irradiation time. The irradiated HDPE behaved as a compatibilizer in HDPE/polycarbonate (PC) blends, and the interface bonding between HDPE and PC was ameliorated. After adding 20 wt% HDPE irradiated at 78 W m^?2 irradiation intensity for 24 h to HDPE/PC blends, the tensile yield strength and notched Izod impact strength of the blend were increased from 26.3 MPa and 51 J m^?1 to 30.2 MPa and 158 J m^?1, respectively. Copyright © 2003 Society of Chemical Industry     

回收高密度聚乙烯/废胶粉共混体系的力学性能研究

探讨了废胶粉（WRP）和回收高密度聚乙烯（RHDPE）共混改性时废胶粉的质量分数、相容剂的种类以及胶粉改性剂对RHDPE／WRP共混体系力学性能的影响。实验结果表明，当废胶粉的质量分数为20％时，体系的综合力学性能最佳。在RHDPE／WRP体系中分别添加EPDM、EVA、EAA时，EVA的增容效果最好，添加5％的EVA能使RHDPE／EVA／WRP体系的冲击强度增加55％。废胶粉经自制表面改性剂ACDI预处理后，其相应的RHDPE／EVA／MWRP体系的拉伸强度和弯曲模量分别增加35％和25％，而对共混物的其它性能影响不大。     

Mechanical and dynamic mechanical properties of waste rubber powder/HDPE composite

Mechanical and dynamic mechanical properties of a waste rubber powder‐filled high‐density polyethylene (HDPE) composite are investigated. Rubber powder is surface‐modified with acrylamide (AAm) using ultraviolet. Rubber powder and HDPE are extruded using a single‐screw extruder and maleic anhydride‐grafted polypropylene is added as a compatibilizer to improve the adhesion between rubber powder and HDPE. The tensile stress and strain of AAm‐grafted rubber powder/compatibilizer/HDPE composites always exhibit higher values than those of unmodified rubber powder/HDPE composites. Surface modification of rubber powder is shown to decrease the magnitude of the tan δ of the HDPE composite. Higher values of the notched Izod impact strength of a surface‐modified rubber‐filled composite is observed compared to those of unmodified rubber‐filled composite. Experimental results show that acryl amide‐grafted rubber powder reacts with maleic anhydride and it results in improved mechanical properties of the HDPE composite. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2595–2602, 2000     

The physical and mechanical properties of polymer composites filled with Fe‐powder

In this study, the effect of Fe powder on the physical and mechanical properties of high density polyethylene (HDPE) was investigated experimentally. HDPE and HDPE containing 5, 10, and 15 vol % Fe metal–polymer composites were prepared with a twin screw extruder and injection molding. After this, fracture surface, the modulus of elasticity, yield and tensile strength, % elongation, Izod impact strength (notched), hardness (Shore D), Vicat softening point, heat deflection temperature (HDT), melt flow index (MFI), and melting temperature (T_m) were determined, for each sample. When the physical and mechanical properties of the composites were compared with the results of unfilled HDPE, it was found that the yield and tensile strength, % elongation, and Izod impact strength of HDPE decreased with the vol % of Fe. As compared with the tensile strength and % elongation of unfilled HDPE, tensile strength and % elongation of 15 vol % Fe filled HDPE were lower, about 17.40% and 94.75% respectively. On the other hand, addition of Fe into HDPE increased the modulus of elasticity, hardness, Vicat softening, MFI, and HDT values, such that 15 vol % Fe increased the modulus of elasticity to about 48%. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006     

Mechanical properties of teak wood flour‐reinforced HDPE composites

Mechanical properties such as tensile and impact strength behavior of teak wood flour (TWF)‐filled high‐density polyethylene (HDPE) composites were evaluated at 0–0.32 volume fraction (Φ_f) of TWF. Tensile modulus and strength initially increased up to Φ_f = 0.09, whereas a decrease is observed with further increase in the Φ_f. Elongation‐at‐break and Izod impact strength decreased significantly with increase in the Φ_f. The crystallinity of HDPE also decreased with increase in the TWF concentration. The initial increase in the tensile modulus and strength was attributed to the mechanical restraint, whereas decrease in the tensile properties at Φ_f > 0.09 was due to the predominant effect of decrease in the crystallinity of HDPE. The mechanical restraint decreased the elongation and Izod impact strength. In the presence of coupling agent, maleic anhydride‐grafted HDPE (HDPE‐g‐MAH), the tensile modulus and strength enhanced significantly because of enhanced interphase adhesion. However, the elongation and Izod impact strength decreased because of enhanced mechanical restraint on account of increased phase interactions. Scanning electron microscopy showed a degree of better dispersion of TWF particles because of enhanced phase adhesion in the presence of HDPE‐g‐MAH. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009