临界组成区域的热敏导电材料加工工艺

研究了开炼，密炼及双螺杆挤出３种不同塑炼方式及采用压制，注射，单螺杆挤出３种不同成型方法对临界组成区域的热敏导电材料电性能及力学性能的影响规律，并对开炼，密炼两种工艺的混炼条件，加料方式及加料顺序进行了考察，结果表明，采用密炼工艺，炭黑（ＣＢ）粒子能得到均匀分布，电阻率较低，拉伸强度及断裂伸长率高，适中的剪切速率及温度有利于ＣＢ粒子分散，采用压制成型法所得样品各向同性。     

聚苯胺/沸石分子筛复合材料的湿敏特性研究

酸化的聚苯胺是一种很有应用前途的感湿材料,沸石分子筛具有离子交换作用和较大比表面积的优良特性。将沸石分子筛与聚苯胺复合,可以增强聚苯胺的吸湿能力和载流子的移动性,进而改良感湿特性。利用结构导向剂法合成了沸石分子筛,与酸化的聚苯胺复合,并测量复合材料的感湿特性。与纯的聚苯胺相比,复合材料在低湿范围内有更好的灵敏度。     

Shear Strength of Pressure Sensitive Adhesives and its Correlation to Mechanical Properties

Correlations between shear resistance and the mechanical properties of pressure sensitive adhesives are studied by measuring the deformation behaviour in the static and the dynamic shear test and determining the dynamic shear modulus of the adhesive. For polymers with low or moderate viscosities, the shear strain vs. time characteristics in a static shear test and, accordingly, the static shear strength, can be evaluated from the master curves of the dynamic shear modulus or the dynamic viscosity. The dynamic shear strength also can be calculated. These exact calculations cannot be applied to highly viscous or slightly crosslinked polymers. On the basis of the model experiments, empirical correlations between shear strength and the dynamic shear modulus are established which seem to be generally valid.     

Swelling of pH‐sensitive chitosan–poly(vinyl alcohol) hydrogels

The swelling properties of different chitosan–poly(vinyl alcohol) (PVA) hydrogels were investigated as functions of the medium pH and salt concentration. The maximum swelling ability of the hydrogels was at a buffer pH of approximately 3, regardless of the PVA content in the hydrogels. The maximum mass of the swollen hydrogels was about 13 times that of their contracted counterparts. The cyclical swelling and contraction between pH 3 and pH 7 buffers and pH 3 and pH 3 buffers with salt confirmed the Donnan swelling mechanism of these hydrogels. The swelling mechanism was considered the transfer of water molecules driven by a concentration gradient. This was represented by a simplified mass‐balance model, which neglected the effect of the ionization reaction, for the initial swelling period. The effective mass‐transfer coefficient of water molecules during swelling, estimated with this model, gradually decreased with increasing PVA content in the hydrogels. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4665–4671, 2006     

Synthesis and characterization of thermosensitive composite microsphere latex

Monodisperse aqueous latex dispersions, prepared from mixtures of styrene, N‐isopropylacrylamide, and N,N′‐methylenebisacrylamide, were characterized. Thermosensitive composite microspheres with diameters greater than 1.0 μm, consisting of a polystyrene core and a poly(N‐isopropylacrylamide) shell, were prepared. The morphology of the composite microspheres was observed with transmission electron microscopy, and the particle size of the composite microspheres was estimated with dynamic light scattering. The thermosensitive properties of the composite microspheres were evaluated via the hydrodynamic size of the composite microspheres. The particle size of the composite microspheres decreased with increasing temperature. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 824–828, 2005     

稳态模拟法求取精馏塔灵敏板的途径

应用化工工艺稳态模拟软件，确定精馏塔的灵敏板，并举例说明求取的过程，对塔的稳定性进行了检验，为精馏塔的可靠性设计和产品质量提供保证。     

Damping of vinyl acetate–n‐butyl acrylate copolymers

A photopolymerization process at room temperature was devised to copolymerize vinyl acetate (VAc) and n‐butyl acrylate (BA) mainly to prepare rubber‐like damping sheet bearing pressure‐sensitive adhesive property in this study. The investigations using both the differential scanning calorimeter and rheometric dynamic analysis show the existence of two glass transition temperatures for each copolymer. The scanning electron microscopic pictures reveal that the degree of microphase separation increases with increasing annealing time at 70°C. It was suggested that the rubbery domain (formed by the PBA blocks) disperses in the glassy domain (constituted by the PVAc blocks), making an effective damping entity. Excellent damping was observed for the copolymer samples, with the tanδ peak values as high as 1.76–1.80 at a certain temperature range and with tanδ> 0.3 at quite wide temperature ranges. In addition, the copolymers containing more VAc tend to have the higher damping. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1396–1403, 2004     

Characterization and application of polypropylene films modified with stimuli‐sensitive copolymers with an Ar‐plasma postpolymerization technique

Surface‐modified polypropylene (PP) films with thermally and photochemically sensitive copolymers consisting of N‐(2‐hydroxypropyl)methacrylamide (HPMA) and 4‐(4‐methoxyphenylazo)phenyl methacrylate (MPAP), poly(HPMA‐co‐MPAP)‐g‐PP (abbreviated g‐PP) film, were prepared by graft copolymerization with an Ar‐plasma postpolymerization technique. The surfaces of the g‐PP films were characterized by means of X‐ray photoelectron spectroscopy; the percentage grafting of poly(HPMA‐co‐MPAP) with a number‐average molecular weight of 3.28 × 10⁴ was 7.12%, and the molar ratio of HPMA–MPAH in the copolymer was 0.75:0.25. The stimuli‐sensitive adsorption of albumin and polystyrene microspheres on the g‐PP film was also measured. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 143–148, 2003     

天然橡胶乳液压敏胶粘剂

本文介绍了天然橡胶胶乳压敏胶的基本情况，内容包括基本组成、主要优缺点和改进方法。     

高固含乳液压敏胶的粒径分析

运用多阶段乳液聚合法可以有效合成高固含乳液乳液粒径无论是单元分散还是多元分散均能实现高固含化在保持乳液稳定的条件下，如果乳液粒径是单元分散，当粒径足够大或者粒径分布足够宽时，乳液实现高固含的同时，可以达到低黏度目的如果是多元分散，粒径分布一般较宽，非常有利于实现乳液低黏度下的高固含化，当乳液的大粒子质量分数在80％左右时最容易达到目的.