Institute of Chemistry
Changchun Institute of Applied Chemistry, Chinese Academy Of SciencesNot a member yet
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Face-On and Edge-On Orientation Transition and Self-Epitaxial Crystallization of All-Conjugated Diblock Copolymer
No full texthe orientation transition and self-epitaxial crystallization of all-conjugated diblock copolymers poly(p-phenylene)-block-(3-hexylthiophene) (PPP-b-P3HT) were systematically investigated by in situ temperature-resolved two-dimensional grazing incidence X-ray diffraction (2D GIXD) in step-by-step heating and cooling process. B39T18 was selected; the results of 2D GIXD showed that the PPP block crystal adopted a face-on orientation while the crystallization of P3HT block was hindered in as-casted films. Three different molecular orientations transition were obtained in self-epitaxial crystallization circles. First, P3HT crystallize with edge-on during the heating process and induced the PPP blocks crystallized with edge-on during the cooling process. Then, the as-casted film was heated in the melting temperature region of PPP blocks and isothermally crystallized. The partial melting of PPP blocks promoted the P3HT blocks crystallize in a face-on due to the steric limitation effect; PPP blocks crystallized with a face-on via the self-epitaxy during cooling. Furthermore, the face-on transformed to thermodynamically stable edge-on in the melt annealing process
Crystalline Ni3C as both carbon source and catalyst for graphene nucleation: a QM/MD study
No full textGraphene nucleation from crystalline Ni3C has been investigated using quantum chemical molecular dynamics (QM/MD) simulations based on the self-consistent-charge density-functional tight-binding (SCC-DFTB) method. It was observed that the lattice of Ni3C was quickly relaxed upon thermal annealing at high temperature, resulting in an amorphous Ni3C catalyst structure. With the aid of the mobile nickel atoms, inner layer carbon atoms precipitated rapidly out of the surface and then formed polyyne chains and Y-junctions. The frequent sinusoidal-like vibration of the branched carbon configurations led to the formation of nascent graphene precursors. In light of the rapid decomposition of the crystalline Ni3C, it is proposed that the crystalline Ni3C is unlikely to be a reaction intermediate in the CVD-growth of graphene at high temperatures. However, results present here indicate that Ni3C films can be employed as precursors in the synthesis of graphene with exciting possibility
Solution-Processed Phosphorescent Organic Light-Emitting Diodes with Ultralow Driving Voltage and Very High Power Efficiency
No full textTo realize power efficient solution-processed phosphorescent organic light-emitting diodes (s-PhOLEDs), the corresponding high driving voltage issue should be well solved. To solve it, efforts have been devoted to the exploitation of novel host or interfacial materials. However, the issues of charge trapping of phosphor and/or charge injection barrier are still serious, largely restraining the power efficiency (PE) levels. Herein, with the utilization of an exciplex-forming couple 4, 4', 4"-tris[3methylphenyl(phenyl)amino]triphenylamine (m-MTDATA) and 1,3,5-tri(m-pyrid-3-yl-phenyl) benzene (TmPyPB), the efficient charge injection and transporting, barrier-free hole-electron recombination for the formation of the interfacial exciplex, and elimination of charge traps of phosphors in the emissive layer are realized simultaneously, resulting in a turn-on voltage of 2.36 V, a record high PE of 97.2 lm W-1, as well as extremely low driving voltage of 2.60 V at 100 cd m(-2), 3.03 V at 1000 cd m(-2) and 4.08 V at 10000 cd m(-2). This report is the first time that the PE performance of s-PhOLED approaches 100 lm W-1 high level, even superior to the corresponding state-of-the-art performance of the same color vacuum-deposited PhOLED (v-PhOLED) counterpart. We anticipate this report opens a new avenue for achieving power efficient monochromatic and white s-PhOLEDs with simple structures
基于可分散聚苯胺的紫外光固化防腐涂料的研究
No full text采用酸性磷酸酯作为掺杂剂对本征态聚苯胺（EB）进行掺杂,制备了可在聚氨酯丙烯酸酯中进行纳米分散的导电聚苯胺（ES）,其分散粒径分布为60765 nm之间,进而制备了不含重金属的紫外光固化聚苯胺防腐涂料.随着体系中导电聚苯胺含量从0.5 wt%增大5.0 wt%,粒径从60100 nm增加到190765 nm.导电聚苯胺含量增大,导致了ES发生团聚,从而粒径增大,进而降低防腐涂层的致密性.当ES含量为1.0wt%时,粒径在110180 nm之间,防腐涂层在3.5 wt%的Na Cl水溶液中浸泡2400 h后,其0.1 Hz下的绝对阻抗值(|Z|0.1 Hz)仍高于1.0×108Ωcm2,同时4550μm的防腐涂层在划叉中性盐雾试验中,500 h内没有出现起泡现象,且锈蚀宽度小于1 mm,表现出优异的防腐性能
多肽/核苷酸合成用固相载体材料纤维素小球的制备及其表征
No full text本文通过对多肽/核苷酸合成用固相载体材料纤维素小球的制备及其表征进行研究分析,通过研究证明:在纤维素小球制备过程中,加入成孔剂淀粉可使纤维素小球,内部呈蜂窝状,空隙较多,为多孔结构。并且纤维素与DMAC/Li Cl配成溶液时浓度要适中,溶液浓度较低时,无法得到完整的纤维素小球
高分子物理与化学国家重点实验室
No full text高分子物理与化学国家重点实验室定位于高分子科学的基础研究和高分子材料的高技术研究,是我国高分子物理与化学研究领域的优秀代表,已成为我国高分子科学与高分子材料的科技创新基地和高水平人才的培养基地
通过高温自由基聚合合成耐热聚甲基丙烯酸甲酯树脂
No full text本文探究了采用乙醇作溶剂,通过高温自由基聚合方法合成耐热甲基丙烯酸甲酯(MMA)与甲基丙烯酰胺(MAAM)共聚物的可行性,研究了聚合温度对Poly(MMA-co-MAAM)共聚物的共聚组成、相对分子质量、相对分子质量分布及共聚物耐热性的影响。结果表明,用乙醇作溶剂,聚合温度在90~120℃范围内可以成功合成高耐热Poly(MMA-co-MAAM)共聚物,其最佳共聚合温度为110℃。在此温度条件下合成的Poly(MMA-co-MAAM)共聚物的相对分子质量分布指数均小于1.5,耐热性最佳,其玻璃化转变温度较同等聚合条件下合成的PMMA均聚物高46
人参皂苷对酒精性肝损伤的保护作用研究
No full text目的研究人参皂苷提取物(GE)对酒精性肝损伤的保护作用与作用机制。方法将ICR雄性小鼠分为正常对照组、阳性对照组(联苯双酯)、模型组及人参皂苷提取物高、中、低剂量组,建立慢性酒精性肝损伤模型,用人参皂苷提取物进行干预,ig给药30 d后,称取肝质量,计算肝脏系数,测定小鼠血清丙氨酸氨基转移酶(ALT)和天门冬氨酸氨基转移酶(AST)活力、三酰甘油(TG)、肝脏内丙二醛(MDA)和还原型谷胱甘肽(GSH)的含量,HE染色观察小鼠肝脏病理变化,综合评价人参皂苷提取物对小鼠酒精性肝损伤的保护作用。结果人参皂苷提取物各剂量组能明显降低酒精性肝损伤小鼠的肝脏系数(P<0.05)、血清TG的含量(P<0.01),可降低其血清中ALT、AST活力(P<0.05或P<0.01),但与正常组ALT、AST活力仍有差异(P<0.05);可在一定程度上降低肝组织中MDA含量(P<0.01),增高肝组织中GSH含量(P<0.01),减少肝组织病理损伤。结论人参皂苷提取物对酒精性肝损伤有一定保护作用,其机制可能与抑制肝内脂肪堆积,抗氧化作用有
长春应化所“氟碳铈矿铈( Ⅳ)、氟、钍、稀土(Ⅲ)萃取分离流程”扩大试验通过专家验收
No full text6月18日,中国科学院长春应用化学研究所廖伍平课题组自主研发的"氟碳铈矿铈( Ⅳ)、氟、钍、稀土(Ⅲ)萃取分离流程"扩大试验在西昌通过了由稀土行业协会副秘书长王晓铁任组长的专家组验收。廖伍平代表课题组向专家组汇报了项目的研究背景、科研思路、试验目标和完成情
以低浓度异甘草素为基质的MALDI-TOF MS用于小分子的检测研究
No full text以低浓度异甘草素(ISL,0.05 mmol/L)为基质,采用基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)对精氨酸、甘露醇和苏氨酸-亮氨酸二肽等小分子物质进行分析检测。实验结果表明,以低浓度异甘草素作为MALDI-TOF MS分析小分子物质的有机基质,所获得的斑点均匀性和重复性、耐盐能力、分辨率等均显著优于常用基质2,5-二羟基苯甲酸(DHB)、2,4,6-三羟基苯乙酮(THAP)。本实验可为有机基质在小分子分析中的应用开辟新的窗口