▪ Abstract Polymer melts exhibit extrusion instabilities at sufficiently high levels of stress, and they appear to exhibit wall slip. I explore the evidence for slip, the possible mechanisms of slip, and the relation between slip and extrusion instabilities.

Extrusion Instabilities and Wall Slip

Quantitative Structure Property Relationship Modeling of Diverse Materials Properties Tu Le, V. Chandana Epa, Frank R. Burden, and David A. Winkler* CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC 3169, Australia CSIRO Materials Science and Engineering, 343 Royal Parade, Parkville 3052, Australia Monash Institute of Pharmaceutical Sciences, 381 Royal Parade, Parkville 3052, Australia

Quantitative Structure–Property Relationship Modeling of Diverse Materials Properties

The local conformation of polymer chains in a film at a substrate interface was examined by sum-frequency generation spectroscopy. When a polystyrene (PS) film was prepared on a quartz substrate by a spin-coating method, the chains were aligned in the interfacial plane of the substrate. A dissipative particle dynamics simulation revealed that a spinning torque induced the chain orientation during the film preparation process and the extent of the orientation was a function of the distance from the interface. This interfacial orientation of chains was not observed for a PS film prepared by a solvent-casting method. Interestingly, the local conformation of chains at the substrate interface was unchanged even at a temperature that was 80 K higher than the bulk glass transition temperature (Tg). This observation means that polymer chains at the substrate interface can be only partially relaxed under conditions where the bulk chains are fully relaxed. On the other hand, interfacial chains could be easily relax...

Local Conformation and Relaxation of Polystyrene at Substrate Interface

A fine polymer particle production method includes producing an emulsion in a liquid prepared by dissolving and mixing a polymer A and a polymer B in organic solvents in which a solution phase composed primarily of the polymer A and a solution phase composed primarily of the polymer B are formed as separate phases, and bringing it into contact with a poor solvent for the polymer A to precipitate the polymer A. This method serves for easy synthesis of fine polymer particles with a narrow particle size distribution and the method can be effectively applied to production of highly heat-resistant polymers that have been difficult to produce with the conventional methods.

Method for producing polymer fine particle

Structure-Activity Relationship Study of the Metallocene Catalyst Activity in Ethylene Polymerization

Consideration of an activity of the metallocene catalyst by using molecular mechanics, molecular dynamics and QSAR

Disclosed is a powder of inorganic compound-loaded polymer particles which has high light scattering property while being safe for the human body. Specifically disclosed is a powder composed of inorganic compound-loaded polyamide porous particles wherein many inorganic compound fine particles are supported by the surfaces and pores of polyamide porous particles each of which has pores in the surface. The powder is characterized in that the average primary particle diameter of the polyamide porous particles is 1-30 μm, the average primary particle diameter of the inorganic compound fine particles is 0.01-0.5 μm, and not less than 80% of the number of the inorganic compound fine particles contains no strong acid component.

Powder composed of inorganic compound-loaded polyamide porous particle

Disclosed are polyamide microparticles, a manufacturing method therefor, an optical film, and a liquid crystal display device using the polyamide microparticles, whereby polarized light can be efficiently converted to non-polarized light that is close to natural light, without accompanying a change in color, and light from a light source can be evenly diffused. The disclosed polyamide microparticles are characterized by including a spherocrystal structure and exhibiting a crystallite size of at least 12 nm, as measured by wide-angle X ray diffraction, and a crystallinity of at least 50%, as measured by DSC. The disclosed optical film is characterized by having a resin layer that contains the aforementioned polyamide microparticles. The disclosed liquid crystal display device is provided with a light-source device, a rear polarizer, liquid crystal cells, and a front polarizer, and is characterized by having the aforementioned optical film between the light-source device and either the front surface of the front polarizer or the rear surface of the rear polarizer.

Polyamide microparticles, manufacturing method therefor, optical film using said polyamide microparticles, and liquid-crystal display device

PROBLEM TO BE SOLVED: To provide a preparation process of polyamide porous particles having a relatively uniform particle diameter and a large specific surface area from a crystalline aliphatic polyamide such as nylon 11 or nylon 12 with a melting point of 200°C or less or a crystalline aliphatic polyamide with a low hygroscopicity of a water absorption of 4% or less by a precipitation process of a polymer without heating a polymer solution. SOLUTION: The preparation process of the porous polyamide particles comprises steps of obtaining a polymer solution (A) by dissolving the crystalline aliphatic polyamide in a solvent, obtaining a polymer suspension (B) by adding another solvent to the above polymer solution (A) and precipitating polyamide porous particles by adding a non-solvent to the polymer suspension (B). COPYRIGHT: (C)2005,JPO&NCIPI

Preparation process of polyamide porous particle

PROBLEM TO BE SOLVED: To embed an inorganic compound or the like on the surface of a resin particle, or to carry an inorganic compound or the like on a porous polymer particle, depending on the kind of the solvent or the like coexisting with the resin particle or the porous polymer particle, There has been a problem that the supported inorganic compound may easily fall off from the resin particles or the porous polymer particles. A resin particle having a number average particle diameter of 1 to 100 μm in which an inorganic compound is encapsulated in a plurality of locations. After the inorganic resin is supported on the porous resin particles, it is preferable to reduce the pores or close the pores. [Selection] Figure 2

Tatsuya Shoji

Papers

Consideration of an activity of the metallocene catalyst by using molecular mechanics, molecular dynamics and QSAR

Powder composed of inorganic compound-loaded polyamide porous particle

Polyamide microparticles, manufacturing method therefor, optical film using said polyamide microparticles, and liquid-crystal display device

Preparation process of polyamide porous particle

Resin particle, method of production thereof and cosmetic