AM/[APy]Br共聚物粘土抑制剂的制备及性能评价

以丙烯酰胺(AM)和溴化N-烯丙基吡啶([APy]Br)为单体,制备了一种离子液体聚合物黏土抑制剂AM/[APy]Br。通过单因素实验法确定了最佳反应条件为:m(AM)∶m([APy]Br)=15∶1,w(引发剂)=0.8%,其中,n(K2S2O8)∶n(Na HSO3)=1∶1,反应温度50℃。并对AM/[APy]Br进行了FTIR和1HNMR表征,对其性能进行了评价。结果表明,在室温下,2 000 mg/L AM/[APy]Br溶液防膨率为80.90%,当温度为90℃时,其防膨率仍达77.97%;2 000 mg/L AM/[APy]Br溶液与0.3 mol/L KCl溶液复配后,防膨率可达96.20%;与0.2 mol/L KCl溶液复配后,防膨率高于0.3 mol/L KCl溶液,复配溶液经4次冲刷,防膨率仍可达76.17%;占溶液总质量3.0%AM/[APy]Br与3.0%KCl复配溶液浸泡后的Na-MMT晶层间距(1.57 nm)明显优于单独使用同等浓度KCl浸泡后的Na-MMT晶层间距(1.62 nm)。     

纺织品中丙烯酰胺含量测定的不确定度评定

通过建立数学模型,按照GB/T 30166-2013,对高效液相色谱法测定纺织品中丙烯酰胺含量进行不确定度评定,分析了测定结果的不确定度来源,评定了各不确定度分量。经数学模型计算,置信水平为95%时,当纺织品中丙烯酰胺含量为2.02 mg/kg时,其扩展不确定度为0.096 mg/kg。结果显示:测量重复性、样液质量浓度、样液定容体积是产生不确定度的主要来源。该不确定度评定方法评定了测量全过程的不确定度分量,为减小测量结果的不确定度提供了参考价值。     

腐植酸交联树脂合成及对Ni(Ⅱ)吸附性能研究

以天然有机高分子腐植酸为主要原料,丙烯酸为共聚单体,N,N'-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,span-65为分散稳定剂,采用反相悬浮聚合法制得腐植酸-N-异丙基丙烯酰胺交联树脂,通过静态吸附实验研究了其对水溶液中Ni(Ⅱ)的吸附性能,探讨了吸附温度、p H值对水中微量Ni(Ⅱ)吸附效果的影响。结果表明腐植酸交联树脂在35℃,p H值为4时对Ni(Ⅱ)的吸附率达到99.8%以上,对Ni(Ⅱ)具有良好的吸附能力。     

响应曲面优化法合成聚丙烯酰胺类共聚物

采用响应曲面优化法(Response surface methodology)以丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)为共聚单体,通过自由基聚合对聚丙烯酰胺类共聚物(PDA)进行制备研究。探讨了3个主要因子单体摩尔比、聚合体系p H、引发剂用量的最佳水平及各自变量间的交互作用对PDA得率的影响,通过该法设计得到了最佳优化条件:单体摩尔比n(AM)∶n(DMDAAC)=2.5∶1,聚合体系p H6.00,引发剂用量为单体总质量的1.00%。在模型提供的最优水平下PDA得率89.807%,与预测值91.6944%相吻合,表明所选模型准确、可靠。该方法为聚丙烯酰胺类共聚物的合成及应用提供了依据。     

Synthesis of a Temperature-Sensitive Matrine-Imprinted Polymer and Its Potential Application for the Selective Extraction of Matrine from Radix Sophorae Tonkinensis

A temperature-sensitive matrine-imprinted polymer was prepared in chloroform by free-radical cross-linking copolymerization of methacrylic acid at 60 °C in the presence of ethylene glycol dimethacrylate as the cross-linker, N-isopropyl acrylamide as the temperature-responsive monomer and matrine as the template molecule. Binding experiments and Scatchard analyses revealed that two classes of binding sites were formed on molecular imprinted polymer (MIP) at 50 °C. Additionally, the thermoresponsive MIP was tested for its application as a sorbent material for the selective separation of matrine from Chinese medicinal plant radix Sophorae tonkinensis. It was shown that the thermoresponsive MIP displayed different efficiency in clean-up and enrichments using the SPE protocol at different temperatures.     

P(AM-g-NBR)改性共混型吸水膨胀丁腈橡胶制备与性能研究

以两亲性接枝聚合物丙烯酰胺接枝丁腈橡胶P(AM-g-NBR)为增溶剂,将丁腈橡胶(NBR)与自制的吸水树脂(SAR-PA)共混制备出了吸水膨胀丁腈橡胶WSR-NB。考察了P(AM-g-NBR)及SAR-PA对吸水橡胶性能的影响。实验结果表明,P(AM-g-NBR)的加入可明显改善吸水橡胶的力学性能及吸水性能;随吸水树脂用量增大,吸水橡胶的拉伸强度降低,吸水率增大。     

Thermoresponsive surface prepared by atom transfer radical polymerization directly from poly(vinylidene fluoride) for control of cell adhesion and detachment

Thermoresponsive surface was prepared from commercial poly(vinylidene fluoride) (PVDF) films via surface‐initiated atom transfer radical polymerization. The direct initiation of the secondary fluorinated site of PVDF facilitated grafting of the N‐isopropylacrylamide (NIPAAm) monomer. The PVDF surfaces grafted with poly(N‐isopropylacrylamide) [P(NIPAAm)] were characterized by X‐ray photoelectron spectroscopy. Kinetics study revealed that the P(NIPAAm) chain growth from the PVDF surface was consistent with a “controlled” process. The temperature‐dependent swelling behavior of the surfaces in aqueous solution was studied by atomic force microscope. At 37°C [above the lower critical solution temperature (LCST, about 32°C) of NIPAAm], the seeded cells adhered and spread on the NIPAAm grafted PVDF surface. Below the LCST, the cells detached from the P(NIPAAm)‐grafted PVDF surface spontaneously. The thermoresponsive surfaces are potentially useful as stimuli‐responsive adhesion modifiers in the biomedical fields.© 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

耐水性室温自交联核壳结构丙烯酸酯乳液的合成及表征

采用核壳结构种子乳液聚合法,以双丙酮丙烯酰胺(DAAM)和己二酸二酰肼(ADH)为交联单体,合成了具有良好耐水性的室温自交联核壳结构丙烯酸酯乳液;研究了交联单体的用量、交联温度、复合乳化剂用量及配比等对乳液性能的影响。FTIR测试证实了交联反应的发生;乳液的粒径图、DSC曲线和TEM表明,乳液具有2个玻璃化转变温度,具有明显的核壳结构。     

共聚法制备高分子聚丙烯酰胺的研究

以氧化还原引发体系为主,配合其它引发剂组成新型复合引发体系。在低温条件下采用水溶液聚合法引发丙烯酰胺和丙烯酸共聚工艺路线制备高分子量聚丙烯酰胺。考查各项因素对聚合反应的影响,最终确定最优化工艺条件：单体浓度0．0035mol／g,氧化还原引发剂14mg／L,EDTA10mg／L,偶氮35mg／L,体系温度0℃,pH值7．0,聚合物分子量为1．943×10^7。     

淀粉与丙烯酰胺接枝共聚物性质的研究

研究了小麦淀粉与丙烯酰胺的接枝共聚物的物理特性和结构特征,实验结果表明:该接枝共聚物在热性质上与原淀粉有明显的区别,其糊化温度比原淀粉略低,粘度热稳定性及溶解度较原淀粉均有提高。接枝共聚反应不仅发生在淀粉颗粒的表面上,而且也发生在颗粒结构的内部,但反应仅发生在淀粉的无定型区。