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| 1 | A Review Featuring Fabrication, Properties and Applications of Carbon Nanotubes(CNTs) Reinforced Polymer and Epoxy Nanocomposites显示文摘Carbon nanotubes(CNTs) have long been recognized as the stiffest and strongest man-made material known to date. In addition, their high electrical conductivity has roused interest in the areas of electrical appliances and communication related applications. However, due to their miniature size, the excellent properties of these nanostructures can only be exploited if they are homogeneously embedded into light-weight matrices as those offered by a whole series of engineering polymers. In order to enhance their chemical affinity to engineering polymer matrices, chemical modification of the graphitic sidewalls and tips is necessary. The mechanical and electrical properties to date of a whole range of nanocomposites of various carbon nanotube contents are also reviewed in this attempt to facilitate progress in this emerging area. Recently, carbonaceous nano-fillers such as graphene and carbon nanotubes(CNTs) play a promising role due to their better structural and functional properties and broad range of applications in every field. Since CNTs usually form stabilized bundles due to van der Waals interactions, they are extremely difficult to disperse and align in a polymer matrix. The biggest issues in the preparation of CNTs reinforced composites reside in efficient dispersion of CNTs into a polymer matrix, the assessment of the dispersion, and the alignment and control of the CNTs in the matrix. An overview of various CNT functionalization methods is given. In particular, CNT functionalization using click chemistry and the preparation of CNT composites employing hyperbranched polymers are stressed as potential techniques to achieve good CNT dispersion. In addition, discussions on mechanical, thermal, electrical, electrochemical and applications of polymer/CNT composites are also included. | Sobia Imtiaz Muhammad Siddiq Ayesha Kausar Sedra Tul Muntha Jaweria Ambreen Iram Bibi | 2018 | Chinese Journal of Polymer Science2018，36，4： | 11 |
| 2 | Thermal, Mechanical and Electrical Studies of Novel Shape Memory Polyurethane/Polyaniline Blends显示文摘Shape memory polymer(SMP) blends based on polyurethane(PU) and polyaniline(PANI) were prepared via chemical in situ polymerization process. The thermal, mechanical, electrical and shape memory properties were investigated. The structural characterization and morphology of the polymer blends were inspected by Fourier transform infrared(FTIR) and scanning electron microscopy(SEM), respectively. The 1 wt% of PANI loading enhanced the thermal stability of the system up to 339 °C. According to differential scanning calorimetry(DSC), the glass transition temperature(Tg) and melting temperature(Tm) of PU/PANI blends increased with the polyaniline loading(0.1 wt%-1 wt%). Improved mechanical properties such as tensile strength and Young's modulus of PU matrix were also observed with PANI. Moreover, the electrical conductivity of PU/PANI blends was also found to be a function of PANI loading. Remarkable recoverability of thermally triggered shape memory(SM) behavior to the extent of 96% was achieved for 1 wt% PANI blend. | Rabia Sattar Ayesha Kausar Muhammad Siddiq | 2015 | Chinese Journal of Polymer Science2015，33，9： | 5 |
| 3 | Cobalt and sulfur co-doped nano-size TiO_2 for photodegradation of various dyes and phenol显示文摘Various compositions of cobalt and sulfur co-doped titania nano-photocatalyst are synthesized via sol–gel method. A number of techniques including X-ray diffraction(XRD), ultraviolet–visible(UV–Vis), Rutherford backscattering spectrometry(RBS), thermal gravimetric analysis(TGA)Raman, N2 sorption, electron microscopy are used to examine composition, crystalline phase, morphology, distribution of dopants, surface area and optical properties o synthesized materials. The synthesized materials consisted of quasispherical nanoparticles of anatase phase exhibiting a high surface area and homogeneous distribution o dopants. Cobalt and sulfur co-doped titania demonstrated remarkable structural and optical properties leading to an efficient photocatalytic activity for degradation of dyes and phenol under visible light irradiations. Moreover, the effect of dye concentration catalyst dose and p H on photodegradation behavior of environmental pollutants and recyclability of the catalyst is also examined to optimize the activity of nano-photocatalys and gain a better understanding of the process. | Asima Siddiqa Dilshad Masih Dalaver Anjum Muhammad Siddiq | 2015 | Journal of Environmental Sciences2015，27，11： | 3 |
| 4 | Poly(vinyl alcohol)/GO-MMT Nanocomposites: Preparation, Structure and Properties显示文摘A facile, efficient and environment friendly method is established to prepare poly(vinyl alcohol)(PVA) based graphene oxide-montmorillonite(GO-MMT) nanocomposites in aqueous media. GO-MMT nanohybrid is obtained by the combination of GO and MMT in water without any reducing or stabilizing agents. The formation of GO-MMT nanohybrid is due to the hydrogen bonding and crosslinking effects. The sodium ions within MMT sheets act as crosslinkers between GO sheets and MMT platelets. The resultant nanocomposites are characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), differential scanning calorimetry(DSC), thermogravimetric analysis(TGA) and mechanical testing. Compared to that of pure PVA, PVA nanocomposites show enhanced thermal stabilities and mechanical properties, which results from strong interfacial adhesion of the nanoadditives in PVA matrix. The further increase in the tensile strength and modulus results from strong interaction between PVA chains and layered GO-MMT as well as good mechanical properties of GO-MMT hybrid, compared to PVA/GO and PVA/MMT nanocompsoites. | Muhammad Raheel Kun Yao Jiang Gong 陈学成 Dong-tao Liu Yi-chao Lin Dong-mei Cui Muhammad Siddiq 唐涛 | 2015 | Chinese Journal of Polymer Science2015，33，2： | 1 |
| 5 | Total phenolics, antioxidant activity, and functional properties of ‘Tommy Atkins’ mango peel and kernel as affected by drying methods显示文摘 | Dalbir Singh Sogi Muhammad Siddiq Ibrahim Greiby Kirk D. Dolan | 2013 | Food Chemistry2013，，3： | 1 |
| 6 | Total phenolics, carotenoids and antioxidant properties of tommy atkin mango cubes as affected by drying techniques 显示文摘 | Sogi Dalbir Singh Siddiq Muhammad Dolan Kirk D | 2015 | Lwt-Food Science And Technology2015，62，1： | 1 |
| 7 | 调节性T细胞对LPS诱导的小鼠早产模型胎盘炎症反应的影响显示文摘目的研究调节性T细胞对脂多糖(LPS)诱导的小鼠早产模型胎盘炎症反应的影响。方法孕17 d小鼠分组为腹腔注射PBS组(Control组),腹腔注射LPS(LPS组),腹腔注射LPS并尾静脉注射PBS组(LPS+PBS组),腹腔注射LPS并尾静脉注射Treg组(LPS+Treg组)。构建LPS腹腔注射诱导的17 d孕小鼠早产模型。在第2剂LPS注射后1、6、12 h及出生时留取胎盘组织,检测Treg细胞标志物叉头翼状螺旋转录因子(Foxp3)、白血病抑制因子(LIF)、血红素加氧酶-1(HO-1)和白介素6(IL-6)mRNA及蛋白表达水平。结果 1 LPS组早产率100%,Control组未发生早产,LPS+Treg组早产率与LPS组和LPS+PBS组差异无统计学意义(P>0.05)。2 LPS组与LPS+PBS组胎盘组织中Foxp3、HO-1、LIF在第二剂LPS注射后1、6、12 h及出生时表达显著下降,IL-6表达显著增高;LPS+Treg组Foxp3、HO-1、LIF表达明显增高,IL-6表达显著降低。结论在LPS腹腔注射诱导的早产小鼠模型中,胎盘组织Treg减少可能是早产的机制之一,HO-1、LIF参与了Treg在母胎界面维持的独特的免疫微环境;Treg过继治疗可通过降低IL-6的表达减轻胎盘组织炎症反应。 | 王凡 林晓洁 肖谧 陈茹娟 Muhammad Siddiq 刘俐 | 2016 | 实用临床医药杂志2016，20，7： | 1 |
| 8 | Mixed Matrix Membranes of Polysulfone/Polyimide Reinforced with Modified Zeolite Based Filler: Preparation, Properties and Application显示文摘In this work, polysulfone/polyimide(PSf/PI) mixed matrix membranes were fabricated by reinforcement of modified zeolite(MZ) particles through solution casting method for investigation of antibacterial activity against two gram negative bacteria(Salmonella typhi, Klebsella pneumonia) and two gram positive bacteria(Staphylococcus aureus, Bacillus subtilis). The modified zeolite particles were incorporated to PSf and PI matrix and the influence of these particles on thermal, mechanical and structural properties was evaluated. The morphological evolution was investigated through scanning electron microscopy(SEM) and transmission electron microscopy(TEM) analysis, which revealed good compatibility between organic polymer matrix and inorganic filler. Mechanical stability was investigated by tensile testing while thermal analysis was evaluated by thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC). This revealed improvement in thermal properties with increasing filler concentration from 1 wt% to 10 wt%. Structural analysis was successfully done using X-ray diffraction analysis(XRD) and Fourier transform infrared(FTIR) spectroscopy. Solvent content of fabricated mixed matrix membranes was observed to decrease while moving from more hydrophilic to less hydrophilic solvent. However, addition of filler content enhanced the porosity of fabricated membranes. The synthesized mixed matrix membranes exhibited good antibacterial activity and the highest activity was shown by PSf/PI/MZ mixed matrix membrane. Therefore, the combination effect of PSf, PI and MZ sufficiently enhanced the antibacterial activity of mixed matrix membranes. | Sedra Tul Muntha Muhammad Siddiq Ayesha Kausar Anum Khan | 2018 | Chinese Journal of Polymer Science2018，36，1： | 1 |
| 9 | Properties of Phosphoric Acid Doped Poly(benzimidazole/sulfone/siloxane/amide)/Sulfonated Polystyrene/Silica Nanoparticle-based Proton Exchange Membranes for Fuel Cells显示文摘New siloxane and sulfone containing poly(benzimidazole/sulfone/siloxane/amide)(PBSSA) has been prepared for the formation of hybrid membranes(PBSSA/PS-S/SiNPs) with sulfonated polystyrene(PS-S) and 0.1 wt%-2 wt% silica nanoparticles(SiNPs). Field emission scanning electron micrographs showed good dispersion of filler, formation of dense nanoporous honeycomb like structure and uniform ionic pathway in these hybrids. The porous membrane structure was responsible for the fine water retention capability and higher proton conductivity of the new hybrids. Increasing the amount of nanoparticles from 0.1 wt% to 2 wt% increased the tensile stress of acid doped PBSSA/PS-S/SiNPs nanocomposites from 65.7 MPa to 68.5 MPa. A relationship between nanofiller loading and thermal stability of the membranes was also experientially studied, as the glass transition temperature of phosphoric acid doped PBSSA/PS-S/SiNPs nanocomposites increased from 207 °C to 215 °C. The membranes also had higher ion exchange capacity(IEC) around 2.01 mmol/g to 3.01 mmol/g. The novel membranes with high IEC value achieved high proton conductivity of 1.10-2.34 S/cm in a wide range of humidity values at 80 °C which was higher than that of perfluorinated Nafion 117 membrane(1.1 × 10-1 S/cm) at 80 °C(94% RH). A H2/O2 fuel cell using the PBSSA/PS-S/SiNP 2(IEC 3.01 mmol/g) showed better performance than that of Nafion 117 at 40 °C and 30% RH. | Ayesha Kausar Muhammad Siddiq | 2014 | Chinese Journal of Polymer Science2014，32，10： | 0 |
| 10 | 一种新型含炔基的聚合2-乙基-2-噁唑啉引发剂的合成(英文)显示文摘本文利用2-苯基-1,3-二氧六环-5-醇合成了含有一个炔基和两个三氟甲磺酸酯基的三官能团引发剂.首先,2-苯基-1,3-二氧六环-5-醇与炔丙溴反应制得含炔基的中间体.然后在稀盐酸和四氢呋喃水溶液中反应制得含双羟基的中间体,最后在四氯化碳中与三氟甲磺酸酐反应制得新型引发剂.该引发剂的结构由核磁共振氢谱确认.并且用该引发剂引发2-乙基-2-噁唑啉的聚合,得到窄分布的聚合物.作为对比,本文同时合成了一种含两个甲苯磺酸基的引发剂,由于两个甲苯磺酸基之间存在较大的空间位阻,该引发剂聚合所得的聚(2-乙基-2-噁唑啉)分布较宽,并且在反应后的体系中存在大量的未反应的引发剂.为了进一步研宄位阻效应对2-乙基-2-噁唑啉聚合的影响,合成了一线性的含一个甲苯磺酸基的引发剂,用该引发剂引发聚合体系中仍有大量未反应的引发剂存在,说明位阻效应和亲电平衡均会影响2-乙基-2-噁唑啉的阳离子开环效率.聚合物分子量及分子量分布通过核磁共振氢谱,基质辅助激光解吸电离-时间飞行质谱和尺寸排阻色谱表征. | Muhammad Waqas Ali 高亚婷 Muhammad Siddiq 叶晓东 | 2018 | Chinese Journal of Chemical Physics2018，31，1： | 0 |
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