聚苯乙烯接枝聚甲基丙烯酸甲酯共聚物的形态结构与性能

扫描电镜观察表明，阴离子聚合、基团转移聚合和大分子反应法联用合成的ＰＳ－ｇ－ＰＭ－ＭＡ共聚物的形态结构是分散的ＰＭＭＡ微粒存在于ＰＳ连续相中的两相体系，其形态特征受制样条件和共聚物组分两方面的影响．ＤＴＡ－ＴＧＡ和应力一应变实验反映了这种接枝共聚物的玻璃化温度降低（Ｔｇ１７５℃，Ｔｇ２４０℃），热分解温度提高（Ｔｄ＝５５０℃，失重＜７０％）和强度增大

甲基丙烯酸酯和丙烯酸酯基团转移共聚的竞聚率

甲基丙烯酸酯和丙烯酸酯基团转移共聚的竞聚率邹友思郭金全戴李宗潘容华（厦门大学化工系，厦门，３６１００５）基团转移聚合是制备极性单体的嵌段或无规共聚物的有效方法。如用甲基丙烯酸甲酯（ＭＭＡ）和丙烯酸丁酯（ＢＡ）进行嵌段共聚，可制得热塑性弹性体［１..

一步法合成无规支化聚苯乙烯（ABPS）的研究

在无水ＺｎＣｌ２催化下，用ＳＯ２Ｃｌ２／ＣＨ２（ＯＣＨ３）２法对阴离子聚合所得的窄分子量分布聚苯乙烯（Ｄ＜１．１０）进行氯甲基化反应，同时使生成的氯甲基化聚苯乙烯发生大分子间的Ｆｒｉｅｄｅｌ－Ｃｒａｆｔｓ反应，一步合成了结构明确的无规支化聚苯乙

聚苯乙烯接枝聚甲基丙烯酸甲酯共聚物的合成新方法

聚苯乙烯接枝聚甲基丙烯酸甲酯共聚物的合成新方法①郭金全邹友思戴李宗袁亿文潘容华（厦门大学化学系厦门３６１００５）阴离子聚合［１］和基团转移聚合（ＧＴＰ）［２］技术可分别使非极性单体和极性单体进行活性聚合，得到分子量分布窄、实际分子量和设计分子量相近的..

The reactivity ratios of group transfer copolymerization of acrylonitrile with methacrylates

Random copolymerization have been performed for three binary systems using 1-methoxy-2-methyl-1-trimethylsilyloxy propene(initiator) and tetrabutylammonium bibenzoate(catalyst) in tetrahydrofuran solution. The copolymer compositions were determined by elementary analysis for nitrogen and the results evaluated by the Kelen-Tudos method, The monomer pairs concerned are (1) acrylonitrile(AN) and methyl methacrylate(MMA), (2) AN and ethyl methacrylate(EMA), (3) AN and butyl methacrylate(BMA), The reactivity ratios determined in this study are: (1) r(AN)=10.22, r(MMA)=0.07; (2)r(AN)= 5.68, r(EMA)=0.16; (3) r(AN)=8.59, r(BMA)=0.09

土地利用影响下地下水位时空变化数值模拟

土地利用与水资源之间是相互作用的互动过程,定量模拟二者的作用过程有利于水土资源的合理开发。选取三工河流域绿洲为研究区域,将GIS与FEFLOW模型结合定量分析与预测模拟土地利用对区域地下水位变化产生的影响。GIS方法处理土地利用、源汇项和边界条件等各类空间数据,运用FEFLOW建立地下水模型进行地下水位变化的预测模拟。根据1998年度的土地利用信息及1998～2003年地下水位的实测数据调试模型参数并校正模型,结果显示模拟效果良好,预测至2010年绿洲上部主要城镇聚居区地下水位逐渐下降,下降幅度显著;绿洲中部经过人为的长期开采,地下水位下降也比较明显,水力梯度明显增加。绿洲下部地下水位呈现缓慢的上升趋势

Studies of the Flame-retarding EFFect and Mechanism of CHPA on Flexible PU Foam

本文研究了含活性氢的氯羟丙基磷酸酯(CHPA)对聚氨酯(Pu)软泡的化学阻燃作用及其阻燃机理.结果表明,含12PHrCHPA的Pu软泡阻燃性达到gb10800—89/I级.通过对阻燃机理的研究,可以认为,在燃烧初期Pu—CHPA中的C—Cl键断裂释出HCl,HCl可与磷酸酯相互作用生成POCl_3、PCl_3和POCl_5等不燃性物,在气相起阻燃作用;在燃烧过程中,这些含P化合物在高温有氧存在下又形成具有很强脱水作用的各种形态磷酸,它们使含氧的Pu软泡炭化形成阻隔燃烧的覆盖层,这些是使软泡具有较佳阻燃性的原因.The Flame-retarding eFFect and mechanism of chlorohydroxypropylphosphate(CHPA) containing active hydrogen on PU Foam were studied.The results showed the Foam containing 12 PHR CHPA hit the Flame-retarding speciFication of GB10800-89/I.The result of the study of the Flame-retarding mechanism of CHPA showed in the early stage of combustion, the C -Cl bond in PU -CHPA was broken and HC1 was released to interact with the phosphate so that incombustible compounds such as POC13, PCl3 ,POCl5 were given ofF to act as Flame-retardants.In the very stage of combustion, under higher temperaturs the compoundes containing phosphorus reacted with oxygen to lead to the producing of varieties of phosphoric acids, whose extremely strong eFFect of dehydration carbonized the PU Foam to Form an insulation surFace layer to prevent the material From Further comubstion.These two aspects were the major reasons because of which the Foam had a Fairly good Flame-retardant property

STUDIES of FLAME-RETARDING MECHANISM of CHPA ON FLEXIBLE PU FOAM

采用含活性氢的氯羟丙基磷酸酯（CHPA）参与Pu发泡配方中的异氰酸酯反应，使生成的软质聚氨酯泡沫（软Puf）分子含阻燃元素Cl、P而实现其阻燃化。研究结果表明，含12PHrCHPA的软质Puf的阻燃性能可达gb10800-89/Ⅰ级。着重研究了CHPA对软质Puf的阻燃机理，提出燃烧初期Puf/CHPA中的C-Cl键断裂，释放出HCl与磷酸酯作用，生成POCl3、PCl3、PCl5等不燃性化合物。此P/Cl化合物一方面因其散发速度比HCl慢，而延长在燃烧区域的停滞时间，更有效地在气相起阻燃作用；另一方面，在高温有氧存在下，与氧作用生成各种形态的磷酸，其强烈的脱水作用使含氧的Puf在层碳化而生成阻隔燃烧的覆盖层，起到固相阻燃的作用。二者的协同是使软质Puf呈较佳阻燃效应的原因。In the Foaming of PU,chlorohydroxypropylphosphate(CHPA) was used to react with the isocyanate to participate the Foaming recipe so that Fire-extinguishing elements such as P,Cl was made to join in the molecular chain of PU to make the Foam Flame-retarding.It was studied to show that the Flame-retarding eFFect of the Flexible PUF containing 12 phr CHPA hit the speciFication of GB-10800-89/I.In this paper,the Flame-retarding mechanism is investigated to show that in the early stage of the combustion,C-Cl bond in PU-CHPA is broken and HCl is given ofF to interact with the phosphate so that incombustible compounds such as POCl_3 PCl_3,PCl_3 are released.On the one hand,they have a smaller volatizing speed than HCl and consequently a longer interval of time to suspend in the material,so they can act more eFFiciently under gas phase;on the other hand,under high temperatures,they react with oxygen in the enviroment to produce varieties of phosphoric acids whose extremelt strong eFFect of dehydration carbonizes the PU Foam to Form an insulation surFace layer to prevent the material From Further combustion,that is,act under solid phase.The cooperation of the two aspects is the major reason to give the PUF a Fairly good Flame-retarding eFFect

ANTISTATIC MODIFYING of ALKYLAMIDE ON THE SURFACE LAYER of PRINTINGPOTTERY-PLASTIC FLOOR BOARD

研究了烷基酰胺ECH—2对陶塑地砖PVC面层抗静电改性的可能性,证明其面层的电阻率、透明度等物性与抗静电剂的用量、配比有关,找到ECH—2最适用量为0.8~0.9份,在与溴磷酸酯协同改性时,又可提高PVC透明膜的阻燃性。用这种改性PVC薄膜作面层,与印花陶塑底层复合制成地砖的性能:表面电阻率3.7x10--8Ω、氧指数30等。达到既抗静电又阻燃的改性效果。The possibility of antistatic modiFying using alkylamide ECH-2 on the surFace layer of printing pottery - plastic PVC Floor board was studied (the results show that the properties of the surFace layer such as electrical resistivity and transparency had relations with the dosage and the mix ratio of the antistatic agent.The optium dosage was proved to be 0.8 - 0.9%.When mixed with bromophoshate to comodiFy.ECH -2 could improve the Flame - resistivity of the material.The compounded Floor board molded of modiFied PVC as surFace layer and printing pottery-plastic as bottom layer had special properties 1,0, 3.7X108,OI 30.The double eFFect of antistatic and Flame-retarding was thus reached

Study on the ModiFied EFFect of APP on the Kaolin Pladtic Floor Material of PVC

研究了以无规聚丙烯（APP）对聚氯乙烯（PVC）/高岭土陶塑板材的改性，并对APP的作用进行了探讨。当添加4份APP时，能有效地提高PVC板材的韧性、抗老化等性能，可增加填料用量，并改善其加工性能，具有较大的经济价值。Using atatic polypropylene(APP)as a mediFer For tbe kaolin plastic Floor materi-al of PVC and the acting of APP are investigated,Addign 4 PHR APP has the eFFects of enhancingtoughness and ageing resistance of PVC Floor material,increasing Filler content and improving process-ability.So it has much economic beneFit