可控制自由基聚合DPE法制备P(AA-MMA-ST)/Fe3O4磁性复合微球

在制备超细Fe₃O₄磁性粒子的基础上, 利用可控制自由基聚合DPE法制备出平均粒径为265 nm的P(AA-MMA-ST)/Fe₃O₄磁性复合微球. 采用XRD, TGA, FTIR等手段对所制备的磁性复合微球的形态、结构及磁响应性等进行了表征, 结果表明用DPE法制备出的磁性复合微球磁含量较高, 粒径比较均匀.     

SINGLE AND BINARY ADSORPTION PERFORMANCE OF SALICYLIC ACID AND 5-SULFOSALICYLIC ACID ONTO HYPERCROSSLINKED POLYMERIC ADSORBENTS

Single and binary adsorption behaviors of salicylic acid and 5-sulfosalicylic acid onto hypercrosslinked polymeric adsorbents, i.e. NDA-101 and NDA-99 were investigated. The Freundlich model can successfully describe all the adsorption isotherms tested, which indicates a favorable and exothermic adsorption process. The adsorption of salicylic acid relies on π-π interaction, while the electrostatic interaction further influences the adsorption of 5-sulfosalicylic acid onto NDA-99. The adsorptive capacity of salicylic acid on NDA-99 decreases but increases on NDA-101 with 5-sulfosalicylic acid as the background component in a binary solute system. The amount of 5-sulfosalicylic acid adsorbed was decreased with the increase in initial concentration of salicylic acid on both adsorbents. The competition for the adsorption sites is considered to be predominant in the solid-to-liquid interaction process. The adsorption selectivity of salicylic acid onto NDA-101 is higher than onto NDA-99 by more than an order of magnitude. Thus, combination technique involving NDA-101 followed by NDA-99 can be effectively applied to separate and recover salicylic acid and 5-sulfosalicylic acid from wastewater.     

尼龙6与半芳香性非晶尼龙原位共混物的结构与性能

一种半芳香的非晶尼龙共聚物溶解于熔融的己内酰胺中,引发后者负离子开环聚合原位制备尼龙6与非晶尼龙的共混物.与纯尼龙6相比较,此原位共混物的强度与模量显著提高.非晶区呈现单一的玻璃化转变,表明共混物为均相体系,其组分的相容性源于负离子聚合过程中链交换反应引起的共聚.与纯尼龙6相比较,此共混物的熔点与结晶度显著降低.此外,与纯尼龙6只存在α晶不同,共混物中伴生有大量的γ晶.当非晶尼龙含量为20 wt%时,绝大部分晶体为γ晶.然而,共混物中球晶仅有一定程度细化.共混物强度和模量的提高被认为主要源于非晶区分子活动能力降低以及γ晶相对含量的提高.     

柄型金属有机化合物(Ⅴ)——锗桥连茚基及取代茚基锆化合物的合成及催化烯烃聚合

锗桥连茚及取代茚配体相继与丁基锂及ZrCl4作用, 生成锗桥连茚基及取代茚基锆化合物Me2Ge(2-R1-4-R2-Ind)2ZrCl2[R1= R2= H(1); R1= Me, R2= H(2); R1= Me, R2= Ph(3)]. 化合物 1-3均为内消旋和外消旋异构体的混合物, 通过多次重结晶得到化合物1和2的纯外消旋异构体及化合物3的内消旋异构体. 由元素分析和 1H NMR 谱表征了化合物的分子结构. 研究了在甲基铝氧烷(MAO)的助催化下, 化合物1-3对乙烯和丙烯聚合的催化性能. 由锗桥连茚基化合物1-3得到的聚乙烯的分子量分布比一般茂金属催化剂略宽. 内消旋和外消旋异构体的混合物(3)由于两个催化活性中心不等同而使得到的聚乙烯的分子量分布相当宽. 外消旋异构体1和2催化丙烯聚合得到高等规聚丙烯.     

二水草酸锌脱水的热分解动力学研究

提出一种多升温速率-等温法确定机理函数g(α)的新方法;并用迭代的等转化率法求出较为可靠的活化能Ea;在Ea和g(α)的基础上计算出指前因子A.用该法对二水草酸锌（ZnC2O4•2H2O）脱水反应的热分解动力学三因子进行了求算,得出Ea为87.22 kJ•mol－1, A为4.2120×108～7.2328×108 s－1;以及随机成核和随后生长型机理函数Am（Avrami-Erofeer）,其积分形式g(α)=[－ln(1－α)] 1/m和微分形式f(α)=m(1－α)•[－ln(1－α)](1－1/m),调节因子m=1.85～2.00.     

影响苯胺电化学计量聚合因素的探讨

本文对影响苯胺电化学计量聚合的因素进行了探讨，这些因素包括：电化学聚合方法、电极电位（Ｅ）、电流密度（Ｉ），以及苯胺单体和酸溶液的浓度等，实验结果表明，最合适的聚合方法为恒电流法，其条件为：电极电位不大于０．７０Ｖ（ｖｓ．ＳＣＥ）聚合电流密度（Ｉ）约为０．０５ｍＡ／ｃｍ＾２，苯胺单体浓度为１．１ｍｏｌ／Ｌ，酸（ＨＣｌ）的浓度则为２．２ｍｏｌ／Ｌ     

STUDY ON THE RECOVERY OF AgNO3 BY IONEXCEHNGE METHOD FROM THE WASTERS

This paper introduces an improved new method which is used to recover silver as silver nitrate by ion exchange from the wasters.In this method,we can recover silver nitrate,only by using a kind of ion exchange resin and two ion exchange processes.It can replace the original recovery method in which two kinds of ion exchange resins and three ion exchange processes are needed.The result is satisfied     

吡罗红Y催化动力学荧光熄灭法测定痕量钒

基于在柠檬酸（０．０６ｍｏｌ．Ｌ＾－１）介质和抗坏血酸（０．００８ｍｏｌ．Ｌ＾－１）存在下，ＶＯ＾－３离子催化ＫＢｒＯ３（０．００４ｍｏｌ．Ｌ＾－１）氧化吡罗红Ｙ（６×１０＾－６ｍｏｌ．Ｌ＾－１）荧光定量熄灭建立了测定痕量钒的新方法，ＶＯ＾－３浓度在０～５０ｎｇ／２５ｍｌ范围内与吡罗红Ｙ相对荧光强度△Ｆ呈直线关系，方法灵敏度高，选择性好，可直接测定水样和人发中的钒。     

原子吸收分光光度法测定异烟肼

ＩＮＨ与Ａｇ（Ｉ）反应，定量析出金属Ａｇ用原子吸收分光光度法测定Ａｇ，从而可间接测定ＩＮＨ，方法用于片剂和血清中ＩＮＨ的测定，结果满意。     

纳米晶掺钇硬质合金粉末的制备

采用高能球磨法制备了纳米晶掺Y硬质合金粉末。用XRD，SEM和DTA等分析检测手段，研究了纳米晶掺Y硬质合金粉末的结构、形貌和相的变化。结果表明：高能球磨45h，可获得晶粒尺寸约为8nm的掺Y硬质合金粉末；微量Y的加入，有利于硬质合金粉末晶粒的细化；在25～45h范围内，随着高能球磨时间的延长，粉末晶粒尺寸减小，且掺Y硬质合金粉末的晶粒尺寸比未掺Y的硬质合金粉末晶粒尺寸要细一倍；高能球磨25h，粉末中Co的X射线衍射峰消失。高能球磨掺Y硬质合金粉末的DTA曲线在626℃出现了1个尖锐的放热峰。高能球磨掺Y硬质合金粉末固结之后，其合金晶粒细小，机械性能较好。