超支化不饱和聚(酰胺-酯)的合成及表征

以顺丁烯二酸酐(MA)与二乙醇胺(DEA)为原料,采用两步法,利用熔融缩聚制得每一个重复单元上均带有碳碳不饱和双键的超支化不饱和聚(酰胺-酯)(HBP),并用傅立叶红外光谱(FTIR)、紫外光谱(UV)、黏度法等对结构进行表征.     

Progress in photonic and optoelectronic active polymers and organic solids

The progress of the researches in photonic and optoelectronic active polymers and organic solids in recent two decades is reviewed with particular attention to the excellent achievements of Chinese scientists. The recent progress in the areas of conducting polymers, organic light-emitting diodes, photoelectric conversion material, material for information storage, and nonlinear optical polymers is introduced. The peculiarities of organic photonic and optoelectronic active materials are briefly compared with those of inorganic photonic and optoelectronic materials.     

HPEI接枝改性PAN/GO-PAA静电纺纳米复合纤维膜对Au(Ⅲ)的吸附

以丙烯酸(AA)为单体,过氧化苯甲酰(BPO)为引发剂,通过原位聚合法,在氧化石墨烯(GO)表面包覆聚丙烯酸(PAA),得到GO-PAA纳米复合物.将GO-PAA纳米复合物分散在聚丙烯腈(PAN)基体中,利用静电纺丝技术得到PAN/GO-PAA静电纺纳米复合纤维膜.利用化学接枝反应在PAN/GO-PAA静电纺纳米复合纤维膜表面接枝超支化聚乙烯亚胺(HPEI),构筑HPEI-g-PAN/GO-PAA静电纺纳米复合纤维膜.研究了HPEI-g-PAN/GO-PAA静电纺纳米复合纤维膜对Au(Ⅲ)的吸附性能.结果表明：HPEI-g-PAN/GO-PAA静电纺纳米复合纤维膜对Au(Ⅲ)的最大吸附量为1 808.60 mg·g^-1,在吸附过程中,部分Au(Ⅲ)被还原为片状和不规则颗粒状的Au单质.在共存离子体系中,HPEI-g-PAN/GO-PAA对Au(Ⅲ)具有较好的吸附选择性.     

氢氧化钠法分离自然水体中的生物膜胞外聚合物

利用氢氧化钠水溶液作为萃取剂,对自然水体中培养的生物膜中的胞外聚合物进行了萃取和分离。通过对糖类、蛋白质、DNA 含量的测定,选择了最佳萃取分离条件。     

Advanced functional safeguarding composites with enhanced anti-impact and excellent thermal properties

Personal safety protection has played an important role in daily life. Developing advanced functional safeguarding composites with enhanced anti-impact and excellent thermal properties will be a significant development for body armor. Herein, Kevlar fiber reinforced polymers (KFRP) were fabricated by introducing short Kevlar fibers (KFs) into a shear stiffening elastomer (SSE). The storage modulus of KFRP with 15 wt% KFs (KFRP-15%) increased from 222.8 kPa to 830.8 kPa when the shear frequency varied from 0.1 Hz to 100 Hz. KFRP-15% achieved a higher tensile strength (2.65 MPa) and fracture toughness (11.95 kJ/m2) than SSE in the vertical type, showing superior tear resistance. Additionally, KFRP-15% exhibited promising anti-impact properties, which could dissipate the drop hammer impact force from 1.74 kN to 0.56 kN and remained intact after 10 consecutive impacts. Moreover, KFRP-15% also presented excellent stab-resistant performance. In addition, KFRP-15% also showed improved heat transfer properties, flame retardancy, and smoke suppression capabilities. Finally, functional bracers based on KFRP-15% for protection, thermal-dissipation, and flame-retardant were successfully prepared.     

Topological Polymer Chemistry for Designing New Macromolecular Architectures

1 Introduction The precise control in polymer architectures has been an ongoing challenge in synthetic polymer chemistry, since new polymer topologies will realize unprecedented properties and functions in polymeric materials. In particular, topologically unique macromolecules comprising single cyclic and multicyclic polymer units have gained growing interests due to their distinctive behaviors from linear and branched counterparts~([1-4]).See Fig.1.1IntroductionThe precise control in polymer…     

A New Route to Hyperbranched Macromolecules :Syntheses of Photosensitive Poly(aroylarylene)s via Regioselective Polycyclotrimerization of Bis(aroylacetylene)s

1Introduction Because of their unique molecular architecture, hyperbranched polymers (hb-Ps) are envisioned to exhibit novel properties, unachievable by their linear congeners, and to serve as advanced functional materials. Realization of the full potential of hb-Ps calls for the exploration of new, versatile methods for their syntheses.     

Active Cooling e-Textiles for Smart Clothing

Cooling function is definitely one of the most desirable attributes of clothing. In spite of the recent progress on phase changing material （PCM） research, the final products with sufficient amount of cooling capability have not yet to be developed in market. A new concept of cooling fabrics has been proposed by applying ＂Peltier effect＂ to textile materials. It occurs whenever electrical current flows through two dissimilar conductors t depending on the direction of current flow, the junction of the two conductors will either absorb or release heat. This effect has been tested on P-type and N-type conducting polymers. A P-type conductive polypyrrole coated fabric was synthesized by in- situ polymerization on plain weave PET to make conductive fabrics. And an N.typo electrically conductive material was synthesized by treatment of MWNT and polyethyleneimine （PEI）. A noticeable amount of temperature difference has been found in the fabric.     

不同联苯类液晶基元对改性超支化聚羟甲基醚液晶性的影响

合成了不同联苯类液晶基元，对超支化聚羟甲基醚进行改性，采用红外，核磁确定液晶基元的结构，通过POM，DSC的研究表明，改性超支化聚羟甲基醚表现出液晶性，且为向列型液晶，不同联苯类液晶基元对改性超支化聚羟甲基醚液晶性有较大的影响。     

顺丁烯二酸酐与二乙醇胺合成的超支化不饱和聚合物的聚合机理

采用“一步法”由二乙醇胺和顺丁烯二酸酐合成超支化不饱和聚合物,用核磁共振技术对聚合物结构进行表征.通过NMR谱图分析,发现聚合物结构中出现次甲基,以此为基础并结合相关文献报道,对聚合机理进行了分析.