Metallocene copolymers of propene and 1‐hexene: The influence of the comonomer content and thermal history on the structure and mechanical properties

The relationships between the structure and properties have been established for copolymers of propylene and 1‐hexene synthesized with an isotactic metallocene catalyst system. The most important factor affecting the structure and properties of these copolymers is the comonomer content. The thermal treatment, that is, the rate of cooling from the melt, is also important. These factors affect the thermal properties, the degree of crystallinity, and therefore the structural parameters and the viscoelastic behavior. A slow cooling from the melt favors the formation of the γ phase instead of the α modification. Regarding the viscoelastic behavior, the β relaxation, associated with the glass‐transition temperature, is shifted to lower temperatures and its intensity is increased as the 1‐hexene content raises. The microhardness values are correlated with those of the storage modulus deduced from dynamic mechanical thermal analysis curves, and good linear relations have been obtained between these parameters. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 1253–1267, 2006     

单层光学薄膜中薄膜－衬底体系的双重干涉效应及其应用

提出了单层光学薄膜中薄膜与衬底反射光之间的双重干涉效应的理论，实验结果证实了理论分析的正确性。双重干涉效应使薄膜－衬底体系的热致反射调制度高达８０％，这一效应可望有极广泛的应用     

热丝CVD生长金刚石薄膜喇曼散射研究

本文报道热丝化学气相沉积法（ＨＦＣＶＤ）生长金钢石薄膜的喇曼散射结果。选取多种峰型，对金钢石薄膜喇曼谱（１１０－１８００ｃｍ－１）采用最小二乘法进行非线性拟合，得到最佳拟合模型，其计算得到的拟合曲线怀实验谱图符合得较好。该模型揭示，石墨Ｄ峰（１３５５ｃｍ－１）是金刚石薄膜喇曼谱中不可缺少的一个组份，并且结合石墨Ｄ峰和金刚石喇曼的空间相关线型，可以解释金刚石喇曼区特殊峰形的物理机制，拟合参量的进一步     

Morphologies of microporous polyethylene and polypropylene crystallized from solution in supercritical propane

The morphologies of solvent-free, microporous, mechanically self-supporting cylinders of linear polyethylene and isotactic polypropylene, crystallized from solution in supercritical propane, were examined by an SEM technique. The morphology of gels (or foams), obtained with little or no shrinkage from 2% to 35% solutions by weight of polyethylene (99% to 85% porosities), is shown in some detail. Lamellae with very little or considerable mutual organization occur, often in the form of stacks with straight or coiled axes (axialites). Further growth of these can lead to particles with a roughly spherical overall shape and a predominantly radial orientation of the lamellae at the particle surface. Subcooled isotactic polypropylene, on the other hand, crystallizes in the form of perfectly shaped birefringent microspheres of very uniform size. ©1995 John Wiley & Sons, Inc.     

Molecular deposition film of porphyrin and phthalocyanine bearing oppositely charged substituents

Ｔｈｅｆｏｒｍａｔｉｏｎｏｆａｎｅｗｔｙｐｅｏｆｓｅｌｆ＿ａｓｓｅｍｂｌｅｄｍｕｌｔｉｌａｙｅｒｆｉｌｍｓ,ｍｏｌｅｃｕｌａｒｄｅｐｏｓｉｔｉｏｎ(ＭＤ)ｆｉｌｍｓ[1,2],ｉｓａｆａｓｔｄｅｖｅｌｏｐｉｎｇａｒｅａｏｆｔｈｉｎｆｉｌｍｒｅｓｅａｒｃｈ.Ｔｈｉｓｎｅｗｍｅｔｈｏｄｏｆｆｉｌｍｐｒｅｐａｒａｔｉｏｎｉｓｂａｓｅｄｏｎｉｏｎｉｃａｔｔｒａｃｔｉｏｎｂｅｔｗｅｅｎｏｐｐｏｓｉｔｅｃｈａｒｇｅｄｃｈｒｏｍｏｐｈｏｒｅｓ.ＩｎｃｏｍｐａｒｉｓｏｎｗｉｔｈｔｈｅｃｌａｓｓｉｃＬａｎｇｍｕｉｒ＿Ｂｌｏ…     

聚丙烯基纳米碳纤维复合材料结晶行为研究

采用示差扫描量热法(DSC)研究了纳米碳纤维对PP／CNF复合材料中PP结晶行为的影响。结果表明：纳米碳纤雏可提高PP的结晶温度，但略降低其结晶速率和结晶度。提高纳米碳纤雏含量或减小纳米碳纤雏直径，PP结晶行为的上述变化更为明显，但结晶速率随纳米碳纤维含量出现先减小后增大的趋势。     

有机/无机异质结薄膜发光二极管

聚合物发光二极管（LED）自从Burrou吵es等于1990年首次报导PPV的电致发光［‘］以来，由于聚合物半导体具有热和化学性能的稳定，克眼了有机小分子材料容易晶化的优点，在平板显示领域必将占有一席之地，从而吸引了许多科学家投身到这一领域来．众所周知，要想实现LED的实用化     

两种荧光LB膜的制备和光谱性能

制取了４－二氰基亚甲基－２－甲基－６－对二甲胺基苯乙烯基－４Ｈ－吡喃（ＤＣＭ）和１，２－双（５－甲基苯并恶唑）基乙烯（ＤＴ）两种荧光分子的ＬＢ膜以及两者的混合膜，以吸收光谱和荧光光谱探讨了膜中分子的构型，微环境，发光性能等特征，发现在ＬＢ膜的缀密排布环境中ＤＣＭ顺式构型的含量较之在溶液中大为增加。     

红外镜反射光谱的测试与解析

红外镜反射（infrared specular reflection，简称SR）光谱与被测样品和衬底的折射指数、吸收指数以及入射角有密切关系，往往由之产生畸变。要从红外镜反射技术测得的光谱处理得到人们熟悉的吸收光谱，需要经过较复杂的计算机数学处理。本文通过几个比较特殊的镜反射例子，以说明镜反射光谱的测试和解析必须注意多种影响因素。