基于双酚AF的含氟聚酰亚胺单体合成

以双酚AF为起始原料,分别合成了含氟聚酰亚胺单体2,2-双(3-氨基-4-羟基苯基)六氟丙烷和2,2-双[4-(4-氨基苯氧基)苯基]-1,1,1,3,3,3-六氟丙烷。该两种产品的合成工艺均适合工业化生产。     

含炔键大双折射液晶的研究进展

阐述了形成大双折射液晶化合物的结构因素和含炔键大双折射液晶化合物的主要研究成果。迄今研究发现:二芳基取代的乙炔类(PTP)液晶双折射范围在0.25~0.49;双烷基联苯炔(PPTP)类液晶双折射范围在0.32~0.5;双苯二乙炔类(PTTP、PTDTP、PTPTP)液晶双折射范围在0.35~0.67;三联苯乙炔苯类液晶化合物双折射值约为0.54;含氰基或异硫氰基的苯炔类液晶双折射范围在0.25~0.79;稠环基苯乙炔类液晶双折射在0.36~0.79。含炔键苯类液晶材料具有较大的双折射值和实用价值。     

Synthesis and characterization of greenish‐blue emitting vinyl copolymer containing pyrene and triarylamine moieties

Two fluorescent monomers N‐phenyl‐N‐(4‐vinylphenyl)pyren‐1‐amine (vinyl‐PyPA) and 1‐vinyl pyrene (VPy) were synthesized in good yields. A series of soluble conductive vinyl copolymers P(PyPA‐co‐VPy) containing vinyl‐PyPA and VPy moieties in different composition ratios were prepared by free radical solution polymerization. These copolymers showed high T_g (190?201 °C) and good thermal stability. The photoluminescence emission maxima of the copolymers were all in the range 474.5?478.5 nm, which was similar to the poly(N‐phenyl‐N‐(4‐vinylphenyl)pyren‐1‐amine) (P(PyPA)) (475 nm) but blue shifted compared with poly(1‐vinyl pyrene) (PVPy) (490.5 nm). The lifetime of the copolymers increased from 10.2 to 29.7 ns with an increase in pyrene content. The copolymers had higher quantum yields (0.51) than those of the homopolymers of P(PyPA) (0.48) and PVPy (0.13). The highest occupied molecular orbital of the copolymers remained relatively unchanged from P(PyPA), while the lowest unoccupied molecular orbital varied from ?2.41 eV to ?2.51 eV with an increase in pyrene ratio in the copolymers. The energy bandgaps of the copolymers (from 2.70 eV to 2.81 eV) were smaller than those of P(PyPA) (2.82 eV) and PVPy (3.47 eV). Two polymer light‐emitting diode (PLED) series were attempted including indium tin oxide (ITO) (fluorocarbon (CFx) treated)/P(PyPA‐co‐VPy)/LiF/Al and ITO(CFx treated)/P(PyPA‐co‐VPy)/1,3,5‐Tri(1‐phenyl‐1H‐benzo[d]imidazol‐2‐yl)phenyl (TPBi)/LiF/Al. The results suggested that the PyPA moiety is hole conducting and the PLEDs can achieve high luminance from 650 to 1150 cd m^?2 (at 100 mA cm^?2) only when an electron injecting layer TPBi is employed. © 2013 Society of Chemical Industry     

Preparation of waterborne polyurethane with outstanding fluorescence properties and programmable emission intensity

The hard segment content and hydrophilic group content of a fluorescent waterborne polyurethane (FWPU) were used to optimize the polymer structure which can influence the fluorescence properties. The synthesis of FWPU was based on 2,2′‐((4‐([3,3′:6′,2″‐terpyridine]‐4′‐yl)phenyl)azanediyl)diethanol (TPPDA) as fluorophore. The structure of FWPU was characterized using Fourier transform infrared and ¹H NMR spectroscopies, and the polymer molecular weight and polydispersity were measured using gel permeation chromatography. The relationship between fluorescence properties and FWPU structure was studied using luminescence spectrometry. Compared to TPPDA, the maximum emission wavelength of FWPU showed a hypsochromic shift, and the fluorescence emission intensity and quantum yield of FWPU were increased obviously. Moreover, increasing the hard segment content led to an enhancement of the fluorescence lifetime of FWPU, and to the fluorescence intensity increasing at first and then decreasing. The fluorescence emission intensity and quantum yield of FWPU were increased nearly 11 and 7 times, respectively, compared to TPPDA when the hard segment content was 65%. With an increase of hydrophilic group content, the fluorescence emission intensity of FWPU increased. The fluorescence emission intensity of FWPU exhibited a response to pH, which facilitated its employment as a fluorescence probe. FWPU with excellent solid fluorescence is very suitable for processing into optical devices, with increasing hard segment content and hydrophilic group content both enhancing the solid fluorescence emission intensity of FWPU. © 2016 Society of Chemical Industry     

含有机硅的磷氮系无卤阻燃剂制备研究

采用苯基三氯硅烷和三氯氧磷与三聚氰胺氰尿酸盐缩聚合成了含有机硅的磷氮系无卤阻燃剂。进行了合成条件的优化研究,得到了较佳的制备方法。将自制的阻燃剂用于注塑级聚丙烯,表明具有更好的阻燃性能和力学性能。     

阻燃型RTV硅橡胶泡沫的制备

以107硅橡胶、含氢硅油、端乙烯基硅油、氢氧化铝、石英砂、辅助发泡剂为主要原料,在铂催化剂的催化下制成室温硫化(RTV)硅橡胶泡沫。研究了辅助发泡剂种类及用量、氢氧化铝用量、发泡温度以及乙烯基苯基硅油对硅橡胶泡沫的发泡性能、阻燃性能和耐辐照性能的影响。结果表明,当使用2.0份丙三醇作辅助发泡剂时,硅橡胶泡沫的发泡系数最大;在20℃下,硅橡胶泡沫的发泡系数最大;添加15份氢氧化铝可有效地提高硅橡胶泡沫的阻燃性能,加入15份乙烯基苯基硅油可提高泡沫硅橡胶的耐辐照性能。     

Ti—PF—Tween80光度法测定钨精矿中微量钛

本文提出在非离子表面活性剂聚乙烯醇(PVA)—Tween80存在下,以苯基萤光酮(PF)为显色剂测定微量钛,其灵敏度较高,摩尔吸光系数ε_(535)=1.91×10~5L·mol~(-1)·cm~(-1),可与取代苯基萤光酮显色媲美,应用于钨精矿中微量钛的测定,回收率为97～101％,结果令人满意。     

糖醋排骨风味香精制备工艺的研究

为制备糖醋排骨风味香精,以排骨汤热反应香精配方为基础,通过单因素试验、正交试验和感官评价,确定糖醋排骨风味香精的最佳工艺配方为：龙门米醋9.30g、蔗糖7.30g、葡萄糖5.00g、木糖1.00g、酵母膏0.90g、猪骨油7.20g、植物水解蛋白液（HVP液）1.35g、呈味核苷酸二钠（I G）0.16g、硫胺素（VB1）0.27g、半胱氨酸0.73g、谷氨酸 0.73g、精氨酸0.73g、脯氨酸0.73g、番茄酱3.50g、花椒油1.00g、红烧酱油2.30g、料酒3.00g、辛香料复合包添加量为香精整体质量的0.10%、猪骨泥酶解液18.75g、猪肉酶解液18.75g。     

加成型硅橡胶的制备与耐热稳定性的研究

采用乙烯基硅油为基胶,含氢硅油为交联剂,苯基硅油和氧化铁为耐热添加剂,制备了加成型耐热硅橡胶。研究了苯基硅油中苯基质量分数、苯基硅油用量、氧化铁用量及协同效应对硅橡胶耐热稳定性的影响。结果表明,随着苯基硅油、氧化铁用量和苯基质量分数的增加,硅橡胶的热稳定性明显增强;当苯基质量分数为10．2％,苯基硅油用量为10份,氧化铁用量为6份时,制得了耐热稳定性良好的硅橡胶,经300℃老化48h后,硬度和拉伸强度分别仅下降了3．77％和13．3％,而未改性硅橡胶老化后分别下降55％和79．3％。TGA结果显示,在苯基硅油和氧化铁协同保护作用下,硅橡胶在400。C高温前,热分解速率很低,这种协同保护效应能很好地提高耐热稳定性。