The lactams are selectively prepared in two diastereomeric configurations, leading to semi-crystalline or amorphous, transparent polymers that can compete with the thermal properties of commercial high-performance polyamides. Copolyamides with caprolactam and laurolactam exhibit an increased glass transition ...
obtained. The amorphicity of poly-3R-caranmide and several co-polyamides is underlined by the preparation of transparent, sonlvent-cast films. A crystal structure of the semi-crystalline poly-3S-caranamide is also presented. As a conclusion, the great potential of these polyamides is shortly ...
Amorphous vs semi-crystalline Figure 11.8 shows the shear modulus and loss tangent of amorphous polymers over a range of temperatures. Amorphous polymer can maintain a high modulus of elasticity before it reaches the thermoelastic range (around glass transition temperature). This means more ultrasonic ...
Amorphous solids, on the other hand, are thought to be liquids at all temperatures. This is because, on being heated, they do not abruptly change into liquids, but instead soften and start flowing in a semisolid form. ☞ Cooling Characteristics The graphical representation of the cooling char...
A shape memory polymeric material has a glass transition temperature, Tg, exceeding room temperature and exhibits rubber modulus and elasticity derived substantially from physical crosslinks is prepared by blending components including one crystalline polymer and two amorphous polymers. Methods of preparing ...
The matrix has a semi-crystalline layer based on semi-crystalline thermoplastic resin having a melting point Tf, on at least one side of which there is an amorphous surface layer based on amorphous thermoplastic resin having a glass transition temperature Tg, in which the glass transition ...
The elastic responses of crystalline and amorphous parts in semi-crystalline nylon 6 have been determined by computer simulation using the finite element method. Semi-crystalline nylon 6 has been modelled as a composite consisting of alternating layers of lamellar crystals and amorphous regions. Full ...
摘要: Flow properties of polyamide-imide polymers are improved by the addition of semi-crystalline nylons or amorphous polyamides. These polymers are useful as engineering resins, laminates, and molded objects.收藏 引用 批量引用 报错 分享 全部来源 求助全文 掌桥科研 相似文献...
Starting from the crystalline phase, by applying a positive pulse above the voltage corresponding to the GST melting temperature, it is possible to cause amorphization of the material resulting in an HRS. The amount of amorphous materials, thus the resistance, can be controlled by the maximum ...
To achieve a competitive storage density and thus lower the cost-per-bit, multiple levels of resistance have to be stored in one single cell by varying the ratio of amorphous and crystalline material. However, this multilevel storage concept is hindered by the so-called resistance drift, which...