三元无规接枝共聚物的合成及其自组装性能的研究

通过甲基丙烯酸羟乙酯(HEMA)引发ε-己内酯(ε-CL)开环聚合得到带有双键的大分子预聚体甲基丙烯酸羟乙酯-聚己内酯(HEMA-PCL), 该预聚体与N-异丙基丙烯酰胺(NIPAAm)及丙烯酸(AAc)自由基聚合得到一系列含有不同比例组分的三元无规接枝共聚物. 研究了该聚合物的自组装性能. 通过1H NMR, FTIR, 凝胶渗透色谱(GPC)对聚合物进行结构和分子量的表征. 通过TEM, DLS与表面张力等方法表征其纳米粒子情况.     

聚羧酸系高效减水剂合成工艺的优化研究

以甲基烯丙基聚氧乙烯醚(HPEG)和丙烯酸(AA)为单体,以过氧化氢-抗坏血酸(H2 O2-Vc)为氧化还原引发体系,以巯基丙酸(MPA)为链转移剂,共聚合成了HPEGAA型聚羧酸减水剂.研究了合成温度、酸醚比及引发剂用量对聚羧酸减水剂分散性能的影响.结果表明,聚羧酸减水剂的最佳合成工艺为:n(AA):n(HPEG)=...     

Acrylic Acid “Reversed” PolyHIPEs

Summary: An oil‐in‐water high internal phase emulsion consisting of acrylic acid, water, and a crosslinker (N,N′‐methylene bisacrylamide) as the water phase, and toluene as the oil phase was successfully stabilised to sustain thermal initiation of radical polymerisation resulting in porous open‐cellular monolithic material. The type of initiator used influenced the average pore size ranging from approx. 708 nm to approx. 1 087 nm, as determined by mercury porosimetry.

Schematic of the preparation of an oil‐in‐water‐type polyHIPE (high internal phase emulsion).     

Binding and Sulfonation of Poly(acrylic acid) on Iron Oxide Nanoparticles: a Novel,Magnetic, Strong Acid Cation Nano‐Adsorbent

Summary: A novel, magnetic, strong acid cation nano‐adsorbent has been developed by the covalent binding of poly(acrylic acid) on the surface of Fe₃O₄ nanoparticles followed by sulfonation using sulfanilic acid via carbodiimide activation. The nano‐absorbent can be easily recovered or manipulated with an external magnetic field and shows a good capacity for the rapid and efficient adsorption of multivalent metal cations from aqueous solutions.

An illustration for the binding and sulfonation of PAA on Fe₃O₄ nanoparticles to produce a magnetic, strong acid cation nano‐adsorbent.     

丙烯酸酯树脂对泰乐菌素的吸附

通过调节单体、交联剂和致孔剂的种类及数量合成了一系列具有不同孔结构的丙烯酸酯树脂,并从中选出具有典型吸附差异的2种树脂,拥有适合的孔分布结构的三羟甲基丙烷三甲基丙烯酸甲酯(TRIM)聚合树脂(1#)和含酰胺基的三烯丙基异氰尿酸酯(TAIC)与TRIM共聚树脂(5#),与商业化大孔丙烯酸酯树脂XAD-7作比较,研究了丙烯酸酯树脂对泰乐菌素的吸附行为和机理。结果表明,树脂1#表现出了对泰乐菌素有最高的吸附量。3种吸附剂的吸附量随溶液pH值的升高呈增加趋势。吸附剂的吸附能力随溶液NaCl离子浓度的增强而提高,而对CuCl2则呈相反趋势,这是因为疏水作用和孔径排斥效应的贡献。泰乐菌素在3种吸附剂上的吸附动力学均符合准二级动力学模型,吸附等温线符合Langmuir模型。升高温度可以使树脂吸附能力增强,可能是“溶剂替代”效应所致。     

丙烯酸改性卤锑阻燃PP的结晶形态

用双螺杆挤出机制备了丙烯酸改性Sb2O3/聚丙烯母料,并注塑成Sb2O3/DBDPO阻燃PP样条.用偏光显微镜和广角X射线研究了阻燃PP中PP的结晶形态.结果表明Sb2O3对PP结晶形态的影响不同于十溴联苯醚（DBDPO）的,根据球晶形态,Sb2O3对PP的异相成核作用比DBDPO的明显,虽然在Sb2O3/PP母料中无β球晶,但在DBDPO/PP和阻燃PP中存在β球晶.对于丙烯酸改性阻燃PP,PP的结晶形态取决于丙烯酸用量,随着丙烯酸用量增加,在高DCP用量条件下,容易形成β球晶.     

芘基查尔酮的合成及三阶非线性光学性质

合成了一种新的具有潜在应用价值的非线性光学(NLO)有机材料1-(芘-1-基)-3-(4-二甲氨基苯基)丙烯酮(PMAK),并通过 NMR、IR、MS和元素分析等技术手段进行了表征。 采用溶液Nd:YAG激光技术测定了PMAK的三阶非线性光学性质并确定了相关参数。 纳秒实验结果:折射率n₂=-3.5×10^-17 m²/W,吸收系数β=7.0×10^-10 m/W,极化率χ⁽³⁾=2.54×10^-11 esu,分子超极化率γ=3.44×10^-30 esu;皮秒实验结果:n₂=-2.8×10^-18 m²/W,β=8.3×10^-11 m/W,χ⁽³⁾=2.49×10^-12 esu,γ=3.33×10^-31 esu。     

Time-temperature-transformation analysis of an acrylic-amino resin system

The curing behaviour of a thermosetting acrylic-amino-formaldehyde resin matrix has been investigated by rheological, thermogravimetric, and thermomechanical analysis. The time-temperature-transformation (TTT) diagram of the solventless resin matrix has been constructed. The gelation curve could be fitted with a power-function of T _gel=118.14·t _gel ^-01238. With the help of this function the conditions for gelation can be calculated, and storability of the matrix can be predicted. The onset temperature of thermooxydative decomposition is 220°C, and the maximum loss of mass belonging to this temperature was found to be 16.3%, corresponding to the ultimate conversion of curing. From iso-T_cure diagrams determined by isothermal thermogravimetric analysis, the iso-curing time (iso-t _cure) and iso-mass loss curves of the TTT diagram have been constructed. The iso-T_cure diagrams determined by TMA measurements, served the construction of the iso-T_cure and iso-glass transition temperature (iso-T _g) diagrams. The T _g of the fully cured system (T _g) was found to be 30°C. The iso-T_g line of 30°C represents the ultimate conversion of the cured system, up to which no degradation takes place. This curve runs below the ultimate conversion determined by thermogravimetric measurements, meaning that above 160°C decomposition takes place simultaneously with curing reactions as supported by the increasing tangent of the straight lines fitted to the last section of thermogravimetric iso-T _cure diagrams. The T _g of the matrix before the cure (T _g0) is less than 0°C. This means that the system is in its rubbery physical state during the curing process.     

Association between benzalkonium chloride and a poly( acrylic acid) gel. Study by microfiltration and membrane dialysis

Interactions between benzalkonium chloride (BAK) and the respective polymers, and the related availability of BAK in the corresponding solution, were studied for aqueous preparations of hydroxyethylcellulose (HEC), polyvinyl alcohol (PVA) and crosslinked poly(acrylic acid) (PAA). The study was performed by means of a crossflow filtration process with an alumina membrane. In the presence of the PAA gel, the rejection rate of BAK is much higher than with HEC or PVA. These results can be explained by the association of the benzalkonium cation BAK⁺ with the negative carboxylate groups or the PAA. This effect, which was confirmed by dialysis experiments, leads to the trapping of BAK⁺ inside the polymer network and could be of interest in the reduction of the harmful effects of BAK observed in the treatment of eye diseases.     

金属表面磷化膜着色工艺的研究 Ⅱ.着色条件对彩色磷化膜性能的影响

金属表面磷化膜着色工艺的研究Ⅱ．着色条件对彩色磷化膜性能的影响温绍国翁志学＊潘祖仁黄志明楼芬丽刘辉（浙江大学高分子科学与工程研究所杭州３１００２７）（浙江大学材料科学与工程系杭州）关键词水溶性丙烯酸树脂，磷化膜，着色１９９６－１２－１１收稿，１９９７...