苯胺在聚醋酸乙烯酯中的聚合研究

以过硫酸铵为氧化剂,十二烷基苯磺酸为掺杂剂,将苯胺在聚醋酸乙烯酯(PVAc)基质中进行原位氧化聚合,制备导电聚苯胺PAn/PVAc复合材料,采用溶液浇铸法制成可溶性导电复合膜,电导率达10-2s/cm。考察了反应条件对复合膜电导率的影响,并进行了环境稳定性测试,用红外光谱进行了复合膜的结构表征,用扫描电镜对复合膜的表面形态进行了观察。     

聚乳酸的直接合成研究(Ⅱ)

研究了以乳酸单体为原料的直接熔融缩聚的工艺条件,包括工艺路线、原料含水率、催化剂种类、温度及余压对合成的影响。结果表明:采用适当的工艺能通过熔融缩聚法制备出高分子质量的聚乳酸,且具有良好的生物降解性能。     

Preparation,characterization, and some physical properties of polypropylene/poly(methyl acrylate)‐grafted glass wool composites

Polypropylene/poly(methyl acrylate)‐grafted glass wool (PMA‐g‐GW) mixes were prepared. The polymerization process was carried out using potassium persulfate (PPS) and PPS/acetone sodium bisulfite (ASBS) as a redox‐pair initiation system at 60 and 70°C. The effect of using PPS or PPS/ASBS on the grafting percent and conversion percent reveals that the conversion percent values on using PPS as an initiator are higher than those of PPS/ASBS, while in the case of grafting, the inverse is true, that is, using PPS as an initiator gives grafting percent values lower than those that can be obtained using PPS/ASBS. The dielectric properties, thermal diffusivity, specific heat capacity, and thermal conductivity of PP loaded with modified glass wool as a function of different types and concentrations of initiators—used in the grafting polymerization process, namely, PPS and the redox initiating system—were also studied. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 723–732, 2003     

Synthesis and characterization of copolythiophene

Copolythiophenes (Co‐PTs), poly(3‐hexylthiophene‐co‐3‐thiophene carboxylic acid) (P3HT‐TCa), poly(3‐hexyloxylthiophene‐co‐3‐thiophene carboxylic acid) (P3HOT‐TCa), and poly(3‐phenylthiophene‐co‐3‐thiophene carboxylic acid) (P3PhT‐TCa), were synthesized by chemical oxidized polymerization to investigate the effect of copolymerization on the properties of polythiophenes (PTs). Gel permeation chromatography showed that the molecular weight (MW) of Co‐PT was lower than that of homopolythiophene. Fourier transform infrared (FTIR) spectra indicated that the copolymerization was successful between the monomers. The λ_max of Co‐PTs gave a “blue shift” in ultraviolet‐visible (UV‐VIS) spectra. Photoluminescence (PL) spectra showed that the PL intensity of Co‐PT became weaker than that of homopolythiophene and the disappearance of PL had been observed in P3HOT‐TCa. The thermal stability of Co‐PT was influenced by the carboxyl for its low decomposition temperature. Furthermore, the copolymerization between multi‐wall carbon nanotube containing thiophene ring (MWNT‐Th) and 3‐hexyloxylthiphene could also take place successfully. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

BaFe12O19/聚氨酯磁性复合微球的制备和表征

通过BaFe12O19硅烷偶联剂改性,聚乙二醇1000、甲苯二异氰酸酯在二甲苯溶液中预聚合,预聚物溶液在分散剂聚乙烯吡咯烷酮K30的水溶液中悬浮聚合,三步合成了BaFe12O19/聚氨酯复合微球.用扫描电镜、红外光谱仪、热重-差示扫描同步热分析仪和振动样品磁强计对微球的形貌、结构、玻璃化温度(Tg)和磁性能进行了表征.结果表明:合成的微球以BaFe12O19颗粒为核聚氨酯为壳.表面分布有微孔,微球粒径在400μm左右,粒径大小可通过控制反应条件调节.微球中磁性物质BaFe12O19的含量为11.11%(质量分数),Tg在290 ℃左右,耐热性能好,微球的饱和磁化强度为3.36×103 A/m,矫顽力为3.06×104 A/m.该复合微球是一种有潜在应用价值的新型血管内栓塞材料.     

Thermal crosslinking of collagen immobilized on poly(acrylic acid) grafted poly(ethylene terephthalate) films

Graft polymerization of acrylic acid onto plasma‐treated poly(ethylene terephthalate) (PET) films was used to prepare surfaces suitable for collagen immobilization by dip‐coating. Such surfaces could be used as matrices for smooth muscle cell cultures in tissue engineering. Contact angle measurements showed that plasma‐treated and grafted PET films undergo considerable surface reorganization during storage under ambient conditions. However, after collagen immobilization the contact angle remained relatively stable. The amount of collagen initially attached to the film surface increased with increasing poly(acrylic acid) graft density, but subsequent washing in water led to significant collagen loss. This loss could nevertheless be substantially reduced by thermal crosslinking of the collagen in the range 110–130 °C. Atomic force microscopy (AFM) observations suggested that the washed crosslinked collagen has a very similar structure to that of the un‐crosslinked collagen. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1874–1880, 2002     

加热方式对聚丙烯酸酯复合胶乳合成反应的影响

采用乳液聚合方式,在搪瓷釜中制备聚丙烯酸酯复合胶乳,根据热量衡算,计算了反应过程中所需的热量,比较了蒸汽加热和热水加热方式的加热效果,以及两种加热方式对乳液粒径和搪瓷釜粘釜情况的影响。结果表明:蒸汽加热方式耗时较短,且乳液成品粒径较小,粘釜情况较热水加热方式有所改善。     

Preparation and protein adsorption of hydrogel polysucrose microspheres

A series of novel hydrogel polysucrose microspheres with the mean size ranging from 200 to 500 μm were prepared via two‐step method. First, soluble polysucrose was synthesized by solution polymerization between sucrose and epichlorohydrin; second, a reversed phase suspension crosslinking reaction was performed to prepare polysucrose microspheres. The SEM images indicated that these spherical beads had smooth surface and hydrogel interior structure. FTIR was used to characterize the chemical structure of the beads. The hydrated and dry densities, equilibrium water content, and hydroxyl content of polysucrose microspheres were also investigated. The characteristic of high hydroxyl content (15.48–19.04 mmol/g) make these microspheres suitable for protein adsorption. Meanwhile, bovine serum albumin was used to examine the adsorption capacity of the microspheres. These microspheres had a capacity as high as 49.28 mg/g. The adsorption kinetics and recycling of the beads were also investigated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5934–5940, 2006     

Humidity‐sensitive properties of new polyelectrolytes based on the copolymers containing phosphonium salt and phosphine function

A simple strategy was developed based on a new reactive function‐ and a salt‐containing new monomer, 4‐vinylbenzyl dimethyl 2‐(dimethylphosphino)ethyl phosphonium chloride (VDEPC), to obtain stable humidity‐sensitive membranes. The major ingredient of a humid membrane is crosslinked polyelectrolytes obtained from copolymers of VDEPC/2‐ethylhexyl acrylate (2‐EHA) = 1/0, 4/1, and 2/1. Isothermal humidity absorption experiments were performed for the estimation of humidity‐sensing materials. The crosslinked copolymers prepared from the reaction of VDEPC/2‐EHA = 4/1 with 1,4‐dichlorobutane showed an average impedance of 595, 39.1, and 3.9 KΩ at 30, 60, and 90% RH, respectively. Their hysteresis, temperature dependence, frequency dependence, and response time were measured. The reliability including water resistance and a long‐term stability were estimated for the application of the common humidity sensor. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1062–1070, 2003     

工业化生产纳米碳酸钙原位聚合聚氯乙烯树脂

在 2 .5万t/aPVC生产装置上实现了纳米碳酸钙与VCM的原位聚合 ,生产出的PVC树脂的表观密度为 0 .5 7～ 0 .6 1g/mL ,增塑剂吸收量为 19.0 %～ 2 5 .6 %。随着纳米乳液的增加 ,聚合时间缩短 ,树脂白度增加。当纳米PVC用量分别为 0、3%、4 .5 %时 ,其最大扭矩分别为 32 .2 6、2 9.19、2 7.4 8N·m ,平衡扭矩分别为 17.6 5、15 .34、14 .4 8N·m ;当纳米PVC树脂用量分别为 3%、4 .5 %时 ,测得其冲击强度、拉伸强度、维卡软化温度分别为 38.5、6 8.9kJ/m2 ,6 9.2、74 .8MPa ,81.0、85 .0℃ ,而用普通PVC测得这三项指标分别为15 .5kJ/m2 、6 1.9MPa、79℃。