Nano-SiO2、fumed SiO2、nano-TiO2、nano-CaCO3 particles were introduced into the pressure sensitive adhesive emulsion of polyacrylate via in-situ emulsion polymerization.The influences of nanoparticle type on emulsion polymerization stability and pressure sensitive properties of composite emulsions were studied.When nano-SiO2,nano-TiO2 particles were introduced,it was discovered that the emulsion polymerization stabilities were excellent and properties of composite emulsions were improved.It was also confirmed that the stability and pressure sensitive properties of nano-SiO2 composite emulsions were not deteriorated after three-month storage.Oppositely,for fumed SiO2、nano-CaCO3,there were higher gelling rate,and whatever the peeling force was the degumming and transfer of adhesive existed.

Polyacrylate/SiO2 organic-inorganic nanocomposite emulsions as pressure sensitive adhesives have been prepared by insitu emulsion polymerization.It was clear that SiO2 particles can be availably dispersed to primary structure and can participate in the composite reaction with polyacrylate on nanoscale dimensions.It was also confirmed that nanocomposite emulsions behave better pressure sensitive properties.In addition to slight reducement of tack,hold strength was slightly improved,and peel strength was remarkedly enhanced by 30%.No residues or gels appeared when the polymerization reaction was magnified 150 times in 700 litre vessel.It has been found that the magnified samples possess the same properties as common experiments.

Polyacrylate/nano-SiO_2 composite emulsions used as pressure sensitive adhesives have been successfully prepared via in-situ emulsion polymerization.Although the surface of nano-SiO_2 was not organically modified,it was discovered through transmission electron microscope that SiO_2 particles can be availably dispersed to primary structure and can participated in the composite reaction with polyacrylate on nanometer scale.It was clearly observed that SiO_2 nanoparticles were embedded within the polymer latex particles,which exhibited a distinctive raspberry morpaology.It was also confirmed that composite emulsions behave better pressure sensitive properties.In addition to slight reducement of tack,hold strength was improved,and peel strength was remarkedly enhanced by 30%.

Nano-SiO_2 particles were introduced into polyacrylate via in-situ emulsion polymerization. The influences of nano-SiO_2 introducing method、emulsifier ratio and seed emulsion source on dispersivity of nano-SiO_2 were studied. It was discovered through TEM and particle size analysis that SiO_2 can be availably dispersed with primary particle structure and participate in the composite reaction with polyacrylate on nanometer scale. It was clearly observed that SiO_2 nanoparticles were embedded within the latex particles, which exhibited a distinctive "raspberry" morpaology.

用X射线粉末衍射仪、X射线能谱仪和等离子体原子发射光谱仪分析了多种矿物基材料的主物相结构和元素组成,并用离子检测仪测定了各材料的负离子发生量.研究表明,具有负离子发生功能的矿物基材料可以由具有明显压电、热电效应的矿物组成,也可以由含有一定量稀土元素和天然原生放射性核素的矿物组成.矿物中适量天然原生放射性核素的存在对于制备高性能的矿物基负离子发生材料是有益的.

In this paper, isothermal and non-isothermal crystallization kinetics of PP and PP based minus ion generating material PPN03 were studied by means of Avrami theory, Hoffmann theory and Ozawa method. The results show that the crystallization rate constants and Avrami exponents of PP and PPN03 are different, which indicate that the perpendicular interfacial free energy per unit area (σ__e) of PPN03 is different from that of PP, and their mechanics of nucleation and crystallization mode are different.

Development and formation mechanism of inorganic-organic nanocomposite emulsion prepared by in situ emulsion polymerization was summarized.Then,the inorganic-organic nanocomposite emulsion used as pressure-sensitive adhesive was synthesized.The influence of introducing method of nanoparticles,emulsifier amount and nanoparticle content on properties was studied.

通过碳纤维(CF)表面官能团的酰氯化,利用酰氯作为己内酰胺阴离子聚合的活化剂,成功地制备了表面接枝尼龙6(PA6)的CF.研究了表面己内酰胺稳定化并阴离子接枝PA6的CF对PA6/CF复合材料力学性能与破坏形态的影响.结果表明,表面接枝PA6后的PA6/CF复合材料界面相互匹配,改善了复合材料界面的相互作用,提高了复合材料的剪切强度,复合材料剪切破坏呈部分非界面脱粘破坏.

This review is about sisal fiber,construction,properties and application of short sisal fiber rein- forced composites.The review of sisal fiber mostly includes the compendium of sisal fiber and the comparison with other fibers,the method of surface treatment and the token for sisal fiber.The review of short sisal fiber reinforced composites mostly includes the study of short sisal fiber reinforced thermoplastic resin,thermosetting resin,rubber, cement,gypsum and other matrix composites.

Polyacrylate/poly(1,6-hexanediodiacrylate) (PA/PHDDA) semi-IPN films and PA/PHDDA/nanoparticle semi-IPN films were obtained via In-Situ polymerization with PA、HDDA and nano-CaCO_3/SiO_2 composite particles as precursors. The solvent resistance properties of semi-IPN films were measured using ethanol and acetone as the solvent. Compared with pure PA films, solvent resistance of semi-IPN films was improved. Meanwhile optical properties of semi-IPN films were determined by measuring the transmittance and the brightness.

Certain noble metals such as silver or gold were supported onto activated carbon fibers using oxidation-reduction properties of activated carbon fibers. The pore structure and surface chemistry of these activated carbon fibers, as well as the particle distribution of metal particles on activated carbon fibers have been characterized. The adsorption properties of xenon on these porous carbon supported noble metals at 35°C have been studied. The results show that the xenon adsorption capacity on activated carbon fiber is evidently enhanced by the supporting of proper amount of noble metals such as silver or gold, which are due to the modification of pore size distribution and surface chemistry of activated carbon fiber, as well as the increase of adsorption potential by the supporting of noble metals.

The effect of high CF content on the multimelting behavior of PA6 was studied by Differential Scanning Calorimetry(DSC).The results show that pure PA6 melts in four melting peaks,and the CF/PA6 composite melts in three melting peaks at lower isothermal crystallization temparature. The high content CF induces PA6 to form crystal, and inhibits the forming of metastable α crystal. At higher isothermal crystallization temperature, PA6 forms the crystal by itself, it is mainly γ crystal and the inducement of CF surface becomes weakly. Two samples melt similarly in two peaks, the high CF content enhance the relative crystallization degree of PA6.

Nano-sized CdS particles with a diameter of about 6 nm and a relatively narrow size distribution were synthesized in inverse micellar solution. In-situ chemical modification of the surface of these particles was carried out by imidazole and thiol molecules, respectively. The morphologies of the particles dispersed in varous solvents were analyzed by TEM observation. FTIR and XPS measurements proved the chemical bonding between the particles and the surface modifiers. UV-Vis absorption and fluorescence emission spectra of CdS suspension in solvents revealed that the surface modification had blocking effects on the surface defects that caused radiationless recombination of charge carriers. The solubility of these re-dispersible nano-powders in different solvents was studied as a function of surface modifier species, modifier dosage as well as solvent effects. The preliminary conclusion is that thiol is more appropriate than imidazole to produce uniform polymer nanocomposites.

重点阐述了阻尼材料在汽车工业、建筑工程、舰船工业、航空航天业、电子机械设备以及日常生活方面的应用,并对阻尼材料的应用发展提出了展望.

The surface chemical structures and adsorption properties of three types of plant-based carbonaceous adsorbents: coconut-shell activated carbon(CAC4),sisal stalk-based activated carbon (SSAC) and sisal-based activated carbon fiber(SACF) were investigated on the basis of the previous study on their pore structures. The surface chemical structures were characterized by XPS, and the adsorption conducted onto these carbons included: liquid-phase adsorption of phenol, iodine and methylene blue; adsorption of organic solvent vapor; and the redox adsorption of Au3+ from aqueous solution. The results show that the three carbons contain several kinds of functional groups on the surface, and SACFSSACCAC4 in adsorption capacities. The adsorption property of carbonaceous adsorbent is determined by not only the pore structure, but also the functional groups on surface.

The pore structure and pore size distributions (PSDs) of three types of plant-based carbonaceous adsorbents: coconut-shell activated carbon(CAC4),sisal stalk-based activated carbon (SSAC) and sisal-based activated carbon fiber(SACF) were analyzed and characterized by different methods(HK, BJH, DR and DFT) according to their nitrogen adsorption isotherms. The results show that CAC4 is microporous and exhibits a narrow PSDs, in which the ultra-micropores under 0.7nm are dominant. The PSDs of SSAC and SACF are very alike. They both contain micropores, mesopores and some macropores, and their mesopore volumes are above 50% of total pore volume. SACF has even more mesopores and wider average pore size than SSAC. Although the three samples are of different porosities and modalities, their behaviors of adsorption could all be well-interpreted by multi-stage micropore filling mechanism.

采用含氟防水剂和硅烷偶联剂对剑麻纤维进行表面处理.通过扫描电镜(SEM)、热重分析(TG)、红外光谱(IR)、X-射线光电子能谱(XPS)和表面张力试验等手段表征了处理前后的剑麻纤维表面状况和热性能的变化.结果表明,防水剂与剑麻纤维的作用主要以化学作用为主,并使得剑麻纤维束的结合力减弱,但是防水剂能有效地降低剑麻纤维的吸水性.KH-550与剑麻纤维的作用主要以物理作用为主,并使得剑麻纤维束结合得更紧

A new method of grafting of nylon 6 on carbon fiber surface by anionic polymerization was put forward. By transforming chemical functions (-COOH, -OH) on carbon fiber surface to CF-NCO, which is an effective activating agent in MC nylon 6 polymerization, the nylon 6 was grafted onto carbon fiber surface successfully. The morphology and structure of grafting nylon 6 on carbon fiber surface were characterized by SEM. The XPS results showed that carbon fiber with grafting nylon 6 on its surface have a higher N/C content from (0.0295) to (0.0573) after grafting. The grafting degree can reach above (1.8%).

用DSC研究了碳纤维(CF)表面阴离子接枝尼龙6(PA6)后复合材料CF/PA6的等温结晶及熔融行为. 结果表明,未接枝的CF对PA6结晶起异相成核作用,使PA6的结晶度增大. 接枝改性CF增强了两相界面间的相互作用,促进成核,但使PA6大分子链的运动受到约束,使PA6的结晶度减小. 接枝导致CF/PA6复合材料界面化学性质相似,因此,具有较高的诱发横穿晶能力. 等温熔融结果表明,较低的结晶温度下,未接枝CF表面的诱导作用有利于基体PA6形成α晶型,接枝改性CF使PA6主要形成亚稳定的γ*晶型. 较高温度下,未改性CF使PA6主要形成γ晶型;接枝改性CF使基体倾向于形成热稳定性较低的γ*型结晶.