改性木质素磺酸盐/LLDPE可降解塑料的制备及其性能水

采用环氧氯丙烷对木质素磺酸盐进行环氧化改性,制得复合材料的最佳原料配比为:环氧化木质素磺酸盐30％,线性低密度聚乙烯60％,邻苯二甲酸二辛酯10％.对环氧化木质素磺酸盐(LER)与线性低密度聚乙烯( LLDPE)共混体系进行性能检测,表明所制备的复合材料具有良好的机械加工性能和生物降解性能.     

木质素电氧化降解的研究

研究了电氧化降解过程中木质素磺酸盐的分子结构、功能团、分子量和表面活性的变化。结果表明,电氧化过程中木质素磺酸盐中的芳环被打开,-SO3H含量和表面活性降低,-COOH含量和分子量先增加后降低。     

二氧化铅膜电极用于木质素磺酸盐电氧化反应的研究：Ⅰ.电解条？…

用一种新型电级－ＰｂＯ２膜电极作阳极对木质素磺酸盐溶液进行电氧化反应，研究中发现在电氧化过程中木质素磺酸盐除发生分子链断裂之外，芳香环开环反应也很显著。研究了溶液ｐＨ值，电解电压及电量对芳香环开环反应的影响。结果表明，高ｐＨ值条件对芳香环开环反应有利，这种条件下电压维持在３．０Ｖ左右具有良好的开环效果，电解电量的增加可提高芳香环开环的程度。     

木质素磺酸盐减水剂对防止混凝土水泥颗粒分散的作用分析

探究了木质素磺酸盐减水剂对防止混凝土水泥颗粒分散的作用。制备木质素磺酸盐减水剂与混凝土水泥颗粒样本,在木质素磺酸盐减水剂浓度为20%、40%与80%的情况下,对同样尺寸、形状与组成成分的混凝土水泥颗粒样本的凝结时间进行记录,并预测相应的分散时间。实验结果:当木质素磺酸盐减水剂浓度为20%、40%、80%时,混凝土水泥颗粒样本的凝结时间为61±0.35、55±0.33、(46±0.46)min,分散时间为(5±0.56)、6±0.37、(8±0.26)a。实验结论:随着木质素磺酸盐减水剂浓度的增高,防止混凝土水泥颗粒分散的作用越大。     

二氧化铅膜电极用于木质素磺酸盐电氧化反应的研究──Ⅰ.电解条件对电氧化过程中芳香环开环反应的影响

用一种新型电极—PbO2膜电极作阳极对本质素磺酸盐溶液进行电氧化反应,研究中发现在电氧化过程中木质素磺酸盐除发生分子链断裂之外,芳香环开环反应也很显著。研究了溶液pH值、电解电压及电量对芳香环开环反应的影响。结果表明,高pH值条件对芳香环开环反应有利,这种条件下电压维持在3．0V左右具有良好的开环效果,电解电量的增加可提高芳香环开环的程度。     

mLLDPE薄膜的光氧化及热力学降解

茂金属线型低密度聚乙烯(mLLDPE)和传统线型低密度聚乙烯(LLDPE)薄膜经紫外灯照射不同时间后,用红外光谱和差示扫描量热法对薄膜跟踪测试。发现mLLDPE的羰基指数及不饱和碳碳双键的变化快于LLDPE;mLLDPE的氧化初始温度及熔融热焓的变化也明显低于LLDPE。     

二氧化铅膜电极用于木质素磺酸盐电氧化反应的研究──Ⅱ.电解条件对电氧化过程中脱色反应的影响

用一种新型电极一PbO_2膜电极对木质素磺酸盐溶液进行电氧化反应,研究了溶液pH值、电解电压和电量对电氧化过程中木质素磺酸盐脱色反应的影响。结果表明,当电解电压维持在2．5V左右时能有效地使木质素磺酸盐发生脱色反应,高pH值条件有利于脱色反应的进行,电解电量的增加可提高脱色程度。     

木质素磺酸盐的结构

Chris Gallaeller(Holnlen化工有限公司)在"木质素磺酸盐一一重粘土工业的助剂"一文中说,尽管木质素与木质素磺酸盐的结构还不完全清楚,但据推测木质素磺酸盐的结构如下图所示。     

二氧化铅膜电极用于木质素磺酸盐电氧化反应的研究：Ⅱ.电解条件？…

用一种新型电极－ＰｂＯ２膜电极对木质素磺酸盐溶液进行电氧化反应，研究了溶液ｐＨ值，电解电压和电量对电氧化过程中木质素磺酸盐脱色反应的影响。结果表明，当电解电解维持在２．５Ｖ左右时能有效地使木质素磺酸盐发生脱色反应，ｐＨ值条件有利于脱色反应的进行，电解电量的增加可提高脱色程度。     

改性木质素磺酸盐处理含镉废水的研究

用自制的改性木质素磺酸盐处理电镀含镉废水,实验表明:在室温条件下.单体用量为1.5 mol/L,反应48 h时,可得到相对分子质量较大、絮凝效果较好的改性木质素磺酸盐.当pH控制在7,改性木质素磺酸盐用量80ms/L,絮凝60 min,室温条件下,可使含镉废水中Cd~(2+)的去除率达到99%以上.     

LLDPE/纳米ZnO复合材料熔体流变性的研究

将纳米ZnO(或改性纳米ZnO)与LLDPE经Brabender挤出机熔融共混制备了LLDPE/纳米ZnO复合材料,采用毛细管流变仪和HAAKE转矩流变仪研究了该复合材料的熔体流变性能,讨论了纳米ZnO、改性纳米ZnO及KH550偶联剂含量对LLDPE熔体流变性能的影响。结果表明:少量纳米ZnO的加入略提高了LLDPE的表观黏度、黏流活化能和熔体的平衡转矩,改性纳米ZnO复合材料的表观黏度比未改性纳米ZnO复合材料的略低。     

LLDPE/纳米ZnO复合材料的制备与性能研究

将改性纳米ZnO与线型低密度聚乙烯(LLDPE)熔融共混、制备了LLDPE/纳米ZnO复合材料。通过SEM观察纳米ZnO粒子在LLDPE基体中的分散情况;研究了复合材料的力学性能及维卡软化点。结果表明:改性纳米ZnO的加入可提高LLDPE的力学性能和维卡软化点。其中,复合材料的拉伸强度、断裂伸长率、冲击强度、弯曲强度的最大值分别比LLDPE提高了17.00%、13.42%、9.90%、7.04%。     

Thermal and mechanical characterization of linear low‐density polyethylene/wood flour composites

A linear low‐density polyethylene (LLDPE) matrix was modified with an organic peroxide and by a reaction with maleic anhydride (MAn) and was simultaneously compounded with untreated wood flour in a twin‐screw extruder. The thermal and mechanical properties of the modified LLDPE and the resulting composites were evaluated. The degree of crystallinity was reduced in the modified LLDPE, but it increased with the addition of wood flour for the formation of the composites. Significant improvements in the tensile strength, ductility, and creep resistance were obtained for the MAn‐modified composites. This enhancement in the mechanical behavior could be attributed to an improvement in the compatibility between the filler and the matrix. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2775–2784, 2003     

New compatibilizer for linear low‐density polyethylene (LLDPE)/clay nanocomposites

Linear low‐density polyethylene (LLDPE) is one of the most widely used polymers in many fields, but it is difficult to prepare LLDPE/clay nanocomposites because of the hydrophobic nature of LLDPE. In this study, the effectiveness of low molecular weight trimethoxysilyl‐modified polybutadiene (Organosilane) as a compatibilizer for LLDPE/clay nanocomposites was studied using X‐ray diffraction (XRD) and correlated with mechanical properties. Organosilane is known to react with dicumyl peroxide (DCP) to form free radicals, which react with LLDPE increasing the polarity of the LLDPE. Based on XRD and mechanical tests, it was concluded that Organosilane is a good compatibilizer for LLDPE and clay. Also when Organosilane was used in preparing LLDPE/clay nanocomposite foams, most mechanical properties were improved. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Hydrophobic modification of dickite and salt spray test study on LLDPE/modified dickite composite

Dickite particles were modified by silane coupling agent, hexadecyl phosphate, oleic acid, and stearic acid (SA), respectively. Modified dickite was composed with linear low‐density polyethylene (LLDPE) to prepare a series of LLDPE/modified dickite composites. Hydrophilicity of modified dickite was characterized by dispersion experiments and contact angle tests. The results indicated that hydrophilicity of modified dickite decreases sharply, compared with nonmodified dickite. Among four modifying agents, SA had obvious effect on hydrophobic modification of dickite. Fourier‐transform infrared spectra results suggested that chemical bonding between modifying agent and dickite was beneficial to the hydrophobic modification. Results of salt spray tests illustrated that the introduction of modified dickite into LLDPE improved the anticorrosion properties of the polymer universally. The anticorrosion mechanism of LLDPE/modified dickite was analyzed by scanning electron microscope micrograph. The mechanical properties of the resultant composites displayed a fact of reinforcement of modified dickite. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

环氧胶粘剂的韧性与增韧机理

本文通过测定三种典型环氧结构胶粘剂：环氧-聚矾，环氧-丁腈40环氧-CTBN的动态力学性能，剥离强度和断裂韧性，观察其断面的电镜照片，分析了三者不同的韧性特点和增韧机理。并发现了PSF改性胶固化后奇特的两相结构。     

The Effect of the Nano-ZnO Concentration on the Mechanical,Antibacterial and Melt Rheological Properties of LLDPE/Modified Nano-ZnO Composite Films

LLDPE/modified nano-ZnO composite films were prepared using LLDPE and KH550-modified nano-ZnO by melt blending and blowing. The research results indicated that the introduction of the modified nano-ZnO improved the mechanical properties of the LLDPE films, the maximum tensile strength and elongation at break were obtained at modified nano-ZnO content of 0.3 wt%. The composite films exhibited favorable antibacterial activity against Escherichia coli and Staphylococcus aureus. The low doped content of modified nano-ZnO in LLDPE matrix made the melt viscosity of the composites increase slightly, it was coincident with variation of the balance torque with the nano-ZnO content.     

HDPE/LLDPE/POE薄膜性能的研究

采用线型低密度聚乙烯（LLDPE）和热塑性弹性体乙烯-辛烯共聚物（POE）对高密度聚乙烯（HDPE）薄膜进行改性,研究了LLDPE和POE对共混体系薄膜力学性能、加工性能的影响,探讨了LLDPE增强HDPE的机理。结果表明,加入一定量LLDPE,使HDPE／LLDPE薄膜的拉伸强度较纯HDPE薄膜有所增加,而单位冲击破损质量则有所下降。当w（LLDPE）为15％时,HDPE／LLDPE薄膜的拉伸强度提高21．6％,薄膜的单位冲击破损质量降低23．0％。在HDPE／LLDPE/POE三元体系中,当w（POE）,w（LLDPE）分别为10％,15％时,薄膜的拉伸强度、单位冲击破损质量、断裂伸长率比纯HDPE薄膜分别提高2．3％,113％。36．0％,综合性能良好。     

THE EFFECT OF ANHYDRIDE MODIFICATION OF SAGO STARCH ON THE TENSILE AND WATER ABSORPTION PROPERTIES OF SAGO-FILLED LINEAR LOW-DENSITY POLYETHYLENE (LLDPE)

Sago starch was chemically modified through esterification using 2-dodecen-1-yl succinic anhydride (DSA) and propionic anhydride (PA) and three different solvents: [N,N dimethylformamide (DMF), triethylamine (TEA), and toluene (TOU)]. The effect of reaction times and temperatures on the modification was investigated. Evidence of anhydride modification was established by the weight percent gain (WPG) and was further confirmed by FTIR. The DSA–DMF and PA–DMF system, when subjected to the reaction condition of 120°C for 5 h, resulted in the highest WPG. Starch modified with 2-dodecen-1-yl succinic anhydride (MS) and propionic anhydride (MS2) was employed in preparation of composites. Samples of composites containing blends of MS/LLDPE and MS2/LLDPE with four different loadings of fillers (10, 25, 40 and 50% based on composite weight) were prepared. With unmodified ST/LLDPE, as the starch content increased, tensile modulus and water absorption increased—but tensile strength and elongation at break showed the opposite effect. With modification, the MS/LLDPE and MS2/LLDPE blends showed improved mechanical and water absorption properties as compared to ST/LLDPE.     

Magnesium hydroxide modified by 1‐n‐tetradecyl‐3‐carboxymethyl imidazolium chloride and its effects on the properties of LLDPE

In this study, Mg(OH)₂ (MH) was first modified by 1‐n‐tetradecyl‐3‐carboxymethyl imidazolium chloride ([C₁₄cim]Cl), an imidazolium ionic liquid, and then the modified MH ([C₁₄cim]Cl‐MH) was incorporated into linear low‐density polyethylene (LLDPE) by melt‐mixing to obtain the LLDPE/[C₁₄cim]Cl‐MH composites. The interaction between [C₁₄cim]Cl and MH was investigated by Fourier transform infrared spectroscopy (FT‐IR). The thermal decompostion behaviors of the LLDPE/[C₁₄cim]Cl‐MH composites were characterized by thermogravimetric analysis (TGA). The flame retardance, tensile and Izod Impact properties of the LLDPE/[C₁₄cim]Cl‐MH composites were tested. For comparison, the LLDPE/MH composites and LLDPE/SA‐MH composites (SA‐MH is stearic acid) were prepared and their properties were studied in the same way. It was found that [C₁₄cim]Cl interacted with MH via chemical bonding, and served as an efficient lubricant and compatibilizer for MH and LLDPE, leading to great improvements of processability and mechanical properties of the LLDPE/[C₁₄cim]Cl‐MH composites. The LLDPE/[C₁₄cim]Cl‐MH composites also showed a remarkably promoted char formation and effectively eliminated melt drips, thus endowing the composites with sufficiently high flame retardancy. POLYM. ENG. SCI., © 2011 Society of Plastics Engineers