阻燃增强尼龙6的研制

以芳香族溴化物、硼酸盐、含氮杂环化物组成复合阻燃体系，以玻璃纤维为增强剂，经高速混俣和双螺杆挤出造粒研制成阻燃增强尼龙６，其阻燃性能达到ＦＶ－０级，缺口冲击强度 ２０ｋＪ／ｍ＾３，拉伸强度１３８ＭＰａ，弯曲强度２４２ＭＰａ，还研究了阻增强尼龙６的流变性能，考察了复合阻燃体系配比、玻璃２纤维含量、尼龙６相对粘度、工艺条件对阻燃增强尼龙６性能的影响。     

短纤维增强HDPE泡沫复合材料的研究

报道了以尼龙－６短纤维增强ＨＤＰＥ结构泡沫材料以及木粉填充ＨＤＰＥ结构泡沫材料的力学性能，探讨了粘合剂对尼龙－６短纤维和ＨＤＰＥ泡沫基材的粘合使用，并分析了不同加工助剂对木粉填充ＨＤＰＥ发泡体系加工性能和外观的影响。     

粉煤灰微珠改性尼龙6的研究

本文研究了粉煤灰微珠填充改性尼龙６的力学性能和热性能，结果表明，微珠的加入，可使尼龙６的拉伸强度、冲击强度、硬度等力学性能得以提高，并能提高制品的热稳定性，降低成本，微珠填充尼龙６具有一定的工业应用价值。     

稀土矿物改性尼龙6的研究

研究稀土矿物（氟碳铈矿）填充改性尼龙６的力学性能和热性能，结果表明，稀土矿物的加入，可使尼龙６的拉伸强度，冲击强度，硬度等力学性能得以提高，并能提高制品的热稳定性，由于稀土矿物价廉，能降低材料成本，因而稀土矿物填充尼龙６具有一定的工业应用价值。     

钛酸酯偶联剂对尼龙1010填充体系流变性的影响

本文研究不同结构的钛酸酯偶联剂处理CaCO_3填料填充尼龙1010体系的熔体流动性。从体系粘度下降程度,结合偶联机理判断偶联剂的偶联效果。     

稀土磁性塑料注射成型技术研究

应用HAAKE转矩流变仪,研究了尼龙6质量分数为7％时,稀土磁性塑料的加工工艺性能。结果表明：稀土磁性塑料喂料体系的润滑剂能有效地降低喂料熔体流动粘度,改善加工条件;而偶联剂会恶化其加工性能;磁粉的粒径分布对原料的粘度和加工工艺有明显的影响,35～65μm的磁粉粒度有利于成型加工;制得了较好综合性能的稀土钕铁硼塑料磁体。     

稀土偶联剂对填料氢氧化镁的表面改性及其应用研究

采用稀土偶联剂、硅烷及钛酸酯偶联剂对氢氧化镁的表面改性,考察了用量、温度、时间对表面改性效果的影响,采用粘度法、表面活化度等指标对改性效果进行了表征。结果表明：稀土偶联剂对氢氧化镁的改性效果较其他二者好,并确定了最佳改性时间、温度及稀土最佳填充量。把稀土改性氢氧化镁填充到PE中,通过对流变曲线分析,表明表面处理体系有较好的流动性和加工性能。SEM观察表明,经表面处理体系的粒子分散性比未经表面处理体系的粒子分散性要好。     

稀土矿物改性尼龙6的研究

研究了稀土矿物(氟磷铈矿)填充改性尼龙6的力学性能和热性能。结果表明,稀土矿物的加入,可使尼龙6的拉伸强度、冲击强度、硬度等力学性能得以提高,并能提高制品的热稳定性。由于稀土矿物价廉,能降低材料成本,因而稀土矿物填充尼龙6具有一定的工业应用价值。     

尼龙6/聚酯(PET)共混体系结晶相分离的研究

用差示扫描量热（ＤＳＣ）考察尼龙６／聚酯（ＰＥＴ）共混体系的结晶行为，表明是结晶相分离的。不同条件下，结晶相分离的过程和形成的结晶态不同，反映在热行为上，如熔融过程和相应特征参数值，便随着处理的条件、组成比等而改变。研究结果还表明，当尼龙６组分的质量分数Ｗ ＰＡ－６＜ ０．１ 时，它被ＰＥＴ 阻隔而不再结晶，因两者形成部分氢键，酯基对尼龙６ 结晶影响的结果，尼龙６／聚酯（ＰＥＴ）共混体系中尼龙６ 的熔融峰温，随组成比的变化呈现波浪形曲线。     

尼龙6工程塑料的研究进展

本文综述了１９９２年以来我国尼龙６工程塑料的的聚集态结构，共混、填充、增强、共聚等改性方法以及流变行为，力学和老化等性能的研究进展。     

氧化钕填充尼龙6的结晶行为

利用示差扫描量热仪（ＤＳＣ）研究了氧化钕（Ｎｄ２Ｏ３）对尼龙６（ＰＡ６）等温结晶行为的影响。结果表明，Ｎｄ２Ｏ３在ＰＡ６体系中起到了异相成核作用，提高了ＰＡ６的晶体增长速率。     

高流动性聚酰胺6、聚碳酸酯复合材料

通过熔融共混的方法制备出一类含有玻璃纤维(GF)或玻璃微珠(GB)和热致液晶聚合物(TLCP)的聚酰胺6(PA6)、聚碳酸酯(PC)增强／填充塑料。毛细管流变测试表明，TLCP作为一种加工助剂，少量加入即可有效降低基体树脂(PA6、PC)的熔体表观黏度。而对于含有短纤维或刚性颗粒填料的三元混杂复合材料，在5％～55％(质量含量，下同)较宽的填料含量范围内，三元混杂复合材料的熔体表观黏度在一定的剪切速率范围内低于或接近于任一纯树脂或任一二元共混物的熔体表观黏度，说明这类增强／填充塑料具有优异的加工流动性。     

Shear viscosity of nylon 6 melts reinforced with microfibrous calcium silicate hydrate

Steady shear viscosity of nylon 6 melts reinforced with xonotlite, microfibrous calcium silicate hydrate (6CaO · 6SiO₂ · H₂O), is investigated. The highly filled nylon 6 melt tends to exhibit a yield value, resulting in remarkable viscosity increase particularly at low shear rates. Addition of the xonotlite significantly increases activation energy of viscous flow of the nylon 6 melt, leading the viscosity to be strongly temperature dependent. Comparisons with the melts filled with glass fibers and wollastonite are made. Flow-induced orientation becomes more important at low volume fractions. Shortening of the xonotlite during shear flow measurement can also be observed.     

Effects on the melt rheology of systems of Nd‐Fe‐B particles suspended in a poly(phenylene sulfide) and liquid crystalline polymer blend

The melt rheology of blends of a liquid crystalline polymer (LCP) and poly(phenylene sulfide) (PPS) and their composites with ferromagnetic Nd‐Fe‐B particles (MQP) was studied. We investigated the effects of LCP concentration, Nd‐Fe‐B particle volume fraction and size, distribution, and shear rate on the rheological properties of these composites. Enthalpy of fusion changes that were observed resulted from the addition of the LCP and Nd‐Fe‐B particles to the polymer blends/composites. The shear rate and frequency dependencies of the materials revealed a viscosity reduction at low (1–3 wt%) and moderate (10–15 wt%) LCP concentrations, and strong effects on the shear‐thinning characteristics of the melt. The suspensions of polydispersed Nd‐Fe‐B particle configurations in PPS that were of lower size ratios gave better processability, which is contradictory to previously reported behavior of suspensions containing spherical particles. Specifically, the compositions with unimodal and a bimodal distribution of Nd‐Fe‐B particles gave the lowest viscosities. The experimental data were correlated with semi‐empirical viscosity model equations of Maron‐Pierce, Krieger‐Dougherty, Eilers, and Thomas and were found to be consistent with the data. The maximum packing fraction, ϕ_m, of the MQP particles was estimated to be within the range of 0.78 ϕ ≤_m ≤ 1.0 through graphical and parametric evaluation methods.     

PP／超细CaCO3／LMPE体系的流变性质

研究了低分子聚乙烯处理的超细碳酸钙填充聚丙烯体系的流变性质,结果表明,填充体系的熔体粘度对低分子聚乙烯的用量和碳酸钙的含量有明显的依赖性,但当碳酸钙与低分子聚乙烯的质量比为某一特定值时,其熔体粘度与体系中碳酸钙的含量无关。该体系的熔体流动行为不能用幂律模型描述,但它却能较好地服从修正的Casson万程。     

Rheological characterization of filled polyamide 11 and polyamide 12 solutions in polyols

A thorough understanding of the rheological properties of real-world, formulated polymer melts and solutions is important to fabricate articles via typical melt processing techniques. Polyamides have been studied extensively in the area of water purification applications. In this work, the viscosity of these homogeneous polyamide 11 and polyamide 12 solutions in specific polyols was measured in the single phase region as a function of shear rate and temperature via capillary rheometry. In addition, the viscosity of the same polyamide solutions containing various levels of dispersed, nanoscale calcium carbonate particles was characterized in order to understand the rheology of the filled systems. Viscosity-reduced shear rate master curves were constructed by applying the principle of time–temperature superposition, and the activation energies were measured for the polyamide-polyol solutions. The observed increase in viscosity caused by the addition of nanofiller could not be explained by simply applying a vertical shift to the master curve, and a density exponent was required to account for the stiffening mechanism. Also, the dependence of the relative viscosity on the filler loading was shown to be consistent with the hypothesis that the filler particles were organized in the form of small fractal aggregates. The filled polyamide 11 systems exhibited higher relative viscosities than the filled polyamide 12 systems, indicating a higher level of particle aggregation and larger mean cluster size for the filled polyamide 11 systems. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48244.     

Nd/ZnO制备及其光催化性能研究

以六水合硝酸锌、六水合硝酸钕和氨水为原料,采用直接沉淀法制备了纯净的氧化锌、掺杂钕的Nd/ZnO光催化剂,分别以甲基橙、亚甲基蓝、苯酚为光催化反应的模型化合物,考察了ZnO、Nd/ZnO光催化剂的紫外光催化活性。结果表明,当Nd在ZnO中掺杂质量百分数为0.5%时,三种模型化合物光催化降解率最大(甲基橙光催化降解率为85.9%,苯酚光催化降解率为27.8%,亚甲基蓝光催化降解率为71.2%);在相同条件下,三种模型化合物光催化降解率大小顺序为:甲基橙!亚甲基蓝!苯酚。     

含Nb2O5和La2O3系统玻璃形成区

用新的玻璃形成区探索方法研究了Ｌａ２Ｏ３的质量分数分别为１％,５％,１０％时含Ｎｂ２Ｏ５,Ｌａ２Ｏ３系统玻璃的形成区（玻璃生成体分别为Ｐ２Ｏ５,ＳｉＯ２,Ｂ２Ｏ３,ＴｅＯ２＋ＧｅＯ２,修饰体为ＢａＯ,ＺｎＯ）,这些系统可作为激光激活离子Ｎｄ＾３＋,Ｙｂ＾３＋,Ｈｏ＾３＋,Ｔｍ＾３＋,Ｅｒ＾３＋等掺杂的理想基质。     

Preparation and properties of melt‐processable polyimides based on fluorinated aromatic diamines and aromatic dianhydrides

Two series of melt‐processable polyimides were prepared from 4,4′‐bis(3‐amino‐5‐trifluoromethylphenoxy)biphenyl (m‐6FBAB) and 4,4′‐bis(4‐amino‐5‐trifluoromethylphenoxy) biphenyl (p‐6FBAB) with various aromatic dianhydrides. The effects of the chemical structures of the polyimides on their properties, especially the melt processability and organic solubility, were investigated. The experimental results demonstrate that some of the fluorinated aromatic polyimides showed good melt processability at elevated temperatures (250–360°C) with relatively low melt viscosities and could be melt‐molded to produce strong and tough polyimide sheets. Meanwhile, the polyimides showed excellent organic solubility in both polar aprotic solvents and common solvents to give stable polyimide solutions with high polymer concentrations and relatively low viscosities. Thus, we prepared high‐quality polyimide films by casting the polyimide solutions on glass plates followed by baking at relatively low temperatures. The polyimides derived from m‐6FBAB showed better melt processability and solubility than the p‐6FBAB based polymers. The melt‐processable polyimides showed a good combination of thermal stability and mechanical properties, with decomposition temperatures of 547–597°C, glass‐transition temperatures in the range 205–264°C, tensile strengths of 81.3–104.9 MPa, and elongations at break as high as 19.6%. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Defect-induced phase transitions in YAl 3 (BO 3 ) 4 :Nd (NYAB) crystals

Besides the traditional borate materials, β-BaB 2 O 4 [1] and LiB 3 O 5 (LBO) [2] such crystals as Li 2 B 4 O 7 (LTBO) [3], CsLiB 6 O 10 (CLBO) [4], YAl 3 (BO 3 ) 4 (YAB) [5], Ca 4 GdO(BO 3 ) 3 (GdCBO) [6] and Ca 4 YO(BO 3 ) 3 (YCOB) [7] are currently being intensively investigated for non-linear optical applications. These materials typically have high viscosity and very often melt non-congruently. These properties create technological problems that can be resolved by applying very precise devices for operating the growth conditions. Another important problem that appears in the borates is an existence of vacancy-induced phase transitions [8]. The occusence of phase transitions in the vacancy-induced YAB crystals is because they possess cationic subsystems formed by ions of different weights. In order to stimulate the vacancy-bearing process, we have doped the crystals with the Nd ions. The defectiveness of the crystals was determined using light scattering similarly to the method described in Ref. [9]. The dimensionless parameter D was introduced as a ratio of the integral light scattering intensity in defective crystals to the same intensity in perfect crystals.