1.Larger diameter (50-10nm) vapor grown carbon nanofibers can be well dispersed in polypropylene melt, while singe wall carbon nanotubes(swnt) were not as well dispersed, techniques such as end-group functionalization, use of ionic surfactants, shear mixing and plasma coating have been used to improve dispersion and exfoliation of carbon nanotubes in polypropylene compatibility with fillers has been improved by matrix modification by grafting it with reactive moieties,such as acrylic acid,acrylic esters,and maleic anhydride.
2.A new copolyamide,nylon 6 11,was prepared by hydrolytic polymerization and melt polycondensation and characterized by means of intrinsic viscosity,fourier transform infraed(ftir) spectroscopy and differemtial scanning calorimetry(DSC)in this paper.it was found that the intrinsic viscosity of nylon 6 11 copolymerization time under vacuum. however,the incorporation of caprolactam into nylon 11 chains did not transform the crystal phase of nylon 11.
3.Solutions of poly(ethylene-co-vinyl alcohol) or evoh,ranging in composition from 56 to71 wt% vinyl alcohol,can be readily electrospun at room temperature from solutions in 70% 2-pr
reactive翻译
opanol/water. The solutions are prepared at 80? And allowed to cool to room temperature. Interestingly, the solutions are not stable at room temperature and eventually the polymer precipitates after several hours. However,prior to precipitation,electrospinning is extensive and rapid,allowing coverage of fibers on various substrates. Fiber diameters of ca. 0.2-0.8um were obtained depending upon the solution concentration.
4.The use of macromonomers is a convenient method for preparing branched polymers. However,graft copolymers obtained by conventional radical copolymerization of macromonomers often exhibit poorly controlled molecular weights and high polydispersities as well as large compositional heterogeneities from chain-to-chain. In contrast,the development of “living”/contolled radical polymerization has facilitated the precise synthesis of well-defined polymers with low polydispersities in addition to enabling synthetic chemists to prepare polymers with novel and complex architectures.
5.The thermal and electrical conductivities in nanocomposites of single walled carbon nanotubes(swnt) and polyethylene(pe)are investigated in terms of swnt loading, the degree
of PE crystallinity,and the pe alignment. Isotropic swnt/PE nanocomposites show a significant increase in thermal conductivity with increasing swnt loading,having 1.8 and 3.5 w/mk at a swnt volume fraction of ?~0.2 in low-density pe(ldpe)and high-density PE(hdpe),respectively.this increase suggests a reduction of the interfacial thermal resistance. Oriented swnt/hdpe nanocomposites exhibit higher thermal conductivities, which are attributed primarily to the aligned pe matrix.
6.We previously discovered that isotropic monomer solution shows birefringence due to its anisotropic structure after gelation in the presence of a small amount of rod-like polyelectrolyte. Here, we focus on what mechanism is responsible for the formation of anisotropic structure during gelation. Various optical measurements are performed to elucidate the structure change during gelation. It is found that the existence of a large-size structure in monomer solution with the rod-like polyelectrolyte is essentially important to induce birefringence during gelation.
7.This work examines the pbt/pet sheath/core conjugated fiber, with reference to melt spinn
ing,fiber properties and thermal bonding. Regarding the rheological behaviors in the conjugated spinning, pet and pbt show the smallest difference between their melt-viscosity at temperatures of 290 and 260 respectively,which has been thought to represent optimal spinning conditions. The effect of processing parameters on the crystallinity of core material-pet was observed and listed. In order of importance,these factors are the draw ratio,the heat-set temperature,and the drawing temperature.
8.Thermoresponsive shape memory fibers were prepared by melt spinning from a polyester polyol-based polyurethane shape memory polymer and were subjected to different postspinning operations to modify their structure. The effect of drawing and heatsetting operations on the shape memory behavior,mechanical properties,and structure of the fibers was studies. In contrast to the as-spun fibers, which were found to show low stress built up on straining to temporary shape and incomplete recovery to the permanent shape,the drawn and heat-set fibers showed signficantly higher stresses and complete recovery.
9.The dry-jet-wet spinning process was employed  to spin poly(lactic acid)fiber by the phas
e inversion technique using chloroform and methanol as solvent and nonsolvent, respectively, for pla. The as-spun fiber was subjected to two-stage hot drawing to study the effect of various process paraments, such as take-up speed,drawing temperature, and heat-setting temperature on the fiber strucural properties. The take-up speed had a pronounced influence on the maximun draw ratio of the fiber. The optimum drawing temperature was observed to be 90 to get a fiber with the tenacity of 0.6Gpa for the draw ratio of 8.
10. The electrostatic spinning technique was used to produce ultrafine polyamide-6 fibers. The effect of solution conditions on the morphological appearance and the average diameter of as-spun fibers were investigated by optical scanning and scanning electron microscopy techniques. It was shown that the solution viscosity,surface tension and conductivity) were important factors characterizing the morphology of the fibers obtained. Among these three properties,solution viscosity was found to have the greatest effect. Solutions with high enough viscosities were necessary to produce fibers without beads.

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