锡偶联型溶聚丁苯胶性能评价

本文研究了具有适宜的苯乙烯、乙烯基含量及其配比的１５立升釜聚合的锡偶联型溶聚丁苯橡胶（Ｓ－ＳＢＲ）的硫化及力学性能、古德里奇疲劳温升、动态力学及摩擦性能，并与低温乳聚丁苯橡胶（Ｅ－ＳＢＲ）进行了平行对比。结果表明，锡偶联型Ｓ－ＳＢＲ是一种集较佳的静态性能、优异的动态性能、令人满意的安全及低能耗性为一体的新型胎面材料。     

增韧SMA的制备及与PC的共混改性

研究了ＳＢＳ增韧ＳＭＡ树脂体系，采用二次共混工艺，用１５％（质量）的ＳＢＳ可以很好地增韧ＳＭＡ树脂；用增韧的ＳＭＡ树脂与ＰＣ进行共混，考察了体系的力学性能和微观相结构，制备出综合力学性能良好、加工性能优于纯ＰＣ的共混材料。当增韧ＳＭＡ／ＰＣ为２０／８０时，共混材料的力学性能与纯ＰＣ相近，达到了预期改性ＰＣ的目的。     

星形SSBR的偶联程度与性能的关系

研究了偶联程度为0－100％的SSBR的物理机械性能和动态力学性能。结果表明，随偶联程度的增高，SSBR的强伸性能提高，宏观动态生热降低。部分偶联结构与全偶联结构试样具有不同的分子运动机理。增加线型分子的质量分数有利于改善混炼胶的粘性流动特性，偶联程度高的试样的硫化胶具有低的损耗角正切（tanδ），偶联程度的提高降低了胶料的动态性能对使用条件的敏感性。偶联程度在60％－80％时具有较佳的综合性能。     

超细Al（OH）3对聚氨酯弹性体性能的影响

以端羟基聚丁二烯和甲苯二异氰酸酯等为主要基材，以超细A1(OH)3作为阻燃消烟剂，制备了聚氨酯弹性体，研究了A1(OH)3粒度和含量对弹性体的物理力学性能和阻燃性能的影响，测试了材料的物理力学性能、可见光的透过率和燃烧性能。结果表明，通过改变填料的粒度和含量，可以大幅度提高材料的物理力学性能和阻燃消烟性能，当粒度(50％填料粒子的粒径)为7．12μm，含量为15份时，聚氨酯材料可以获得较佳的阻燃消烟效果和物理力学性能。     

相容剂对PS／PP共混合金混容形态和性能的影响

研制了马来酸酯接枝聚丙烯相容剂，并将其用于聚苯乙烯／聚丙烯的共混改性；通过力学性能测试、透射电镜分析、差示扫描量热分析等方法研究了相容剂对ＰＳ／ＰＰ合金的混容形态和力学性能的影响。结果表明：相容剂的加入，使ＰＳ／ＰＰ由不相容的独立聚集的两相变为相畴很小的细分散相，共混高分子的链段运动也表现为趋于均相结构的运动方式。加入相容剂后共混材料的冲击强度有明显提高，拉伸强度也有所上升。相容剂的含量对性能也有较大影响，相容剂用量为８％时，力学性能最好，从ＤＳＣ测试中可以看到此时共混物趋向均相体系；继续增大相容剂用量，合金的力学性能反而下降。     

碳纤维增强聚砜颅骨修补材料耐介质老化性能的研究

本文对ＬＣＦ／ＰＳＵ颅骨修补材料及颅骨的耐９５％酒精和生理盐水老化性能进行了研究。研究发现ＬＣＦ／ＰＳＵ材料与颅骨有着相似的耐９５％酒精老化性能，但ＬＣＦ／ＰＳＵ材料比频骨有着更为优良的耐生理盐水老化性能，当ＬＣＦ含量超过１０ｗｔ％时，ＬＣＦ／ＰＳＵ颅骨修补材料耐生理盐水老化性能优于耐９５％酒精老化性能。     

碳纤维增强聚砜颅骨修补材料耐介绍老化性能的研究

本文对ＬＣＦ／ＰＳＵ颅骨修补材料及颅骨的耐９５％酒精和生理盐水老化性能进行了研究。研究发现ＬＣＦ／ＰＳＵ材料与颅骨有着相似的耐９５％酒精老化性能，但ＬＣＦ／ＰＳＵ材料比频骨有着更为优良的耐生理盐水老化性能，当ＬＣＦ含量超过１０ｗｔ％时，ＬＣＦ／ＰＳＵ颅骨修补材料耐生理盐水老化性能优于耐９５％酒精老化性能。     

溶聚丁苯橡胶的结构与性能

研究了多官能团引发剂一步法合成的溶聚丁苯橡胶（SSBR）的结构及偶联程度对其物理性能和动态力学性能的影响，并与日本合成橡胶公司的SL552进行比较。试验结果表明，随着偶联程度的增大，SSBR的强伸性能提高，压缩疲劳温升降低，抗湿滑性提高，且偶联程度为60％的SSBR的物理性能与SL552相近。偶联程度的提高可使胶料的动态粘弹性降低。为了保证胶料达到优异的低生热特性和良好加工性能的综合平衡，偶联程度以60％为宜。     

耐热ABS/PC/SMAH三元合金的研究

研究了ＡＢＳ／ＰＣ／ＳＭＡＨ三元合金中ＳＭＡＨ,ＰＣ含量变化对合金力学性能,耐热性能的影响及不同橡胶含量的ＡＢＳ对合金冲击性能的影响。实验发现组成为ＡＢＳ２０％,ＰＣ５０％,ＳＭＡＨ３０％时,选择高橡胶含量的ＡＢＳ可得得综合的性能较好的高耐热ＡＢＳ／ＰＣ／ＳＭＡＨ三元合金。     

常压烧结莫来石／氧化锆／碳化硅复相陶瓷的研究

本文对莫来石／氧化锆／碳化硅复相陶瓷进行了Ｎ２气氛中常压烧结的研究。实验结果表明：ＳｉＣ粒子添加量≤２０ｖｏｌ％，材料均可致密烧结并可获得均匀的微观结构。ＳｉＣ粒子的加入使材料人力学性能较莫来石／氧化锆陶瓷有明显的提高，并在ＳｉＣ含量为１０ｖｏｌ％时达到峰值，室温强度和断裂韧性分别为６０１ＭＰａ和５．８ＭＰａ＾Ｃ２，接近热压材料。     

Synthesis of dysprosium/Mn–Cu ferrite binary nanocomposite: Analysis of structural,morphological, dielectric,and optomagnetic properties

Manganese–copper ferrite (MCFO) and dysprosium (Dy)-doped manganese–copper ferrite nanocomposites (Mn_0.5Cu_0.5Dy_xFe_2−xO₄) (x = 0, 0.05, 0.10, and 0.15) were synthesized by sonochemical method. Crystal structure and the structural parameters of the MCFO were analyzed based on the doping concentration of Dy ion. It was observed that the average crystalline size of the synthesized nanocomposite decreases when the concentration of Dy increases. The existing spherical surface morphology of the MCFO and Dy-doped MCFO nanocomposites were obtained through scanning electron microscopy. In the UV spectrum, the pristine MCFO sample showed an absorbance peak at 743 nm whereas the absorbance values of Dy-doped ferrite nanocomposite considerably shifted (blue) toward a lower wavelength (231–222 nm). The dielectric parameters of all ferrite nanocomposites were studied in the frequency range of 100 Hz to 5 MHz. The dielectric spectrum revealed that dielectric constant and loss tangent decreased with increased doping concentration of Dy ion. The saturation magnetization also changed with Dy doping in MCFO. The impact of Dy on manganese–copper ferrite changed the optical, dielectric and magnetic properties of the prepared binary ferrite nanocomposite, which can be used for microwave-absorbing material applications.     

Mechanical Properties of Compression Molded Banana Pseudo-stem Filled Unplasticized Polyvinyl Chloride (UPVC) Composites

Mechanical strengths of a banana pseudo-stem (BPS) fiber and unplasticized polyvinyl chloride (UPVC) composite were evaluated to assess the possibility of using it as a new material in engineering applications. Samples were fabricated by the compression molding process with reference to the effect of filler loading. The samples were submitted to mechanical tests to measure tensile, flexural, and impact properties of the composites. The nature of adhesion between the matrix and the reinforcement and information relating the structure of mechanical properties can be obtained by scanning electron microscopy (SEM) assessment of the composite fracture surface. The mechanical properties show that the composites did not have good adhesion between filler and matrix; on the other hand, the filler insertion improved the flexural modulus and the material rigidity.     

单向玻璃纤维-铝合金层板的几种力学性能研究

本文用实验方法研究了单向玻璃纤维-铝合金层板的拉伸性能、疲劳性能和冲击性能。利用金属体积分数理论验证了这类层板的拉伸性能。通过对其疲劳性能的实验研究，发现裂纹扩展速率的大小及刚度的下降与加载的最大循环应力密切相关的规律。实验发现该层板具有比铝合金好得多的冲击性能。     

TMPTMA在硅橡胶中的应用研究

研究了助交联剂三羟甲基丙烷三甲基丙烯酸酯(TMPTMA)对硅橡胶硫化性能、力学性能、低温性能和粘接性能的影响。结果表明,加入少量TMPTMA能改善硅橡胶的硫化特性和工艺性,提高硫化胶的硬度,降低硅橡胶的结晶温度,并有效提高硅橡胶与金属的粘接强度;但TMPTMA用量超过一定数值后,由于TMPTMA部分自聚合,在硅橡胶内形成一定的交联网络,造成两相界面粘接力变差,致使硅橡胶的拉伸强度降低。当TMPTMA用量为1份时,硅橡胶具有最佳的综合性能。     

核壳型纳米粒子合成方法及其性能的研究进展

核壳纳米粒子作为复合纳米粒子一个重要的分支,由于其光、磁和催化等方面的优异性能,近年来引起了人们广泛的关注.本文主要介绍了核壳纳米粒子的制备方法及诸多性能,并对核壳纳米粒子的发展进行了展望.     

Effects of support and additive on oxidation state and activity of Pt catalyst in propane combustion

The effects of support and additive on the oxidation state and catalytic activity of Pt catalyst in the low temperature propane combustion were systematically investigated on Pt/MgO, Pt/Al₂O₃ and Pt/SiO₂–Al₂O₃. The catalytic activity varied much with both support materials and additives. The catalyst on the more acidic support showed higher activity, and the catalytic activity on every support materials increased as the electronegativity of additives increased, while some additives decreased the activity. The oxidation state of platinum, estimated by white line intensity of Pt L_III-edge XANES spectrum, also varied with the support and additives, and additives with higher electronegativity greatly prevented the platinum from its oxidation under oxidising atmosphere. Among almost all the catalysts with various supports and various additives, a clear relationship was observed between the oxidation state of platinum and the catalytic activity; the more metallic platinum showed higher activity. Thus, it was concluded that the total electrophilic/electrophobic property derived from those of the support and additive controls the oxidation state of platinum, which intensively affects the catalytic activity; i.e. higher electrophilic property provides less oxidised platinum, resulting in high catalytic activity. The mechanism of this effect was also discussed on the basis of thermochemical data, and it was proposed that the electrophobic materials promote the noble metal oxidation since the noble metal oxo-anion such as PtO^δ− is more stabilised with electrophobic cation.     

丁腈橡胶的伏安特性与功率特性的研究

本文对乙炔碳黑填充丁腈橡胶（NBR）的伏安特性及其功率特性进行了研究,分析了丁腈橡胶在交、直流电场下的导电机理,并对环境温度变化时的丁腈橡胶的功率及功率与电压的变化规律提出了相应的关系式,同时对导电丁腈橡胶的物理机械性能进行了研究与测定。     

聚丙烯基抗菌塑料的制备与性能研究

利用熔融挤出共混技术制备了聚丙烯(PP)基抗菌塑料。研究了抗菌母料Antim-PP对PP的抗菌性能和力学性能的影响。结果表明,当抗菌母料与PP的质量比为4:100时,抗菌PP塑料对大肠杆菌的抗菌率大于99%,抗菌母料的加入使共混物的冲击性能有明显改善,其他力学性能基本不受影响。     

阻隔性PET/PEN共聚酯的性能研究

对共聚型阻隔聚酯PETNx(x为共聚酯中NDA占羧酸总质量的百分比)的热性能、流变性能和阻隔性能进行了研究。结果表明,PETNx体系属于假塑性流体。PETNx的CO2气体阻隔性优于常规PET;随着PETNx中NDA含量的增加,共聚物的玻璃化温度呈线性增高。