极低密度聚乙烯与其它聚乙烯的共混

从结构角度，用ＤＳＣ，ＷＡＸＤ，ＳＡＸＳ研究了聚乙烯（ＰＥ）家族中极低密度聚乙烯（ＶＬＤＰＥ）与其它ＰＥ的互容性．ＨＤＰＥ／ＶＬＤＰＥ是共晶互容的，以其大量无规部分“溶解”了ＨＤＰＥ的结晶缺陷部分，提高了ＨＤＰＥ的Ｔｃ，Ｔｍ，Ｘｃ，结晶峰半高宽变窄，晶胞参数随组成而有最低值．ＶＬＤＰＥ与ＬＬＤＰＥ结构极为相似，ＤＳＣ及ＷＡＸＤ证明其共混物是共晶相容体系．ＬＤＰＥ／ＶＬＤＰＥ的结晶度符合按组成的计算值，但晶胞参数ａ，ｂ以及晶粒尺寸增大，ＤＳＣ上有分别相应于两组份的两个Ｔｍ；ＶＬＤＰＥ的Ｔｃ，Ｔｍ峰高之和高于按组份的计算值，ＬＤＰＥ的Ｔｍ，Ｔｃ则低于计算值．认为是正如ＬＬＤＰＥ／ＬＤＰＥ，ＬＤＰＥ向充满整个体积的ＶＬＤＰＥ中不断填入，以ＶＬＤＰＥ为晶核而结晶，形成相分离的不相容体系．     

高密度聚乙烯／低密度聚乙烯／乙烯—醋酸乙烯共聚物共混体系的结晶行为

通过ＤＳＣ和ＷＡＸＤ研究了高密度聚乙烯／低密度聚乙烯／乙烯－醋酸乙烯共聚物（ＨＤＰＥ／ＬＤＰＥ／ＥＶＡ）三元共混体系的热行为和结晶性能，发现当ＨＤＰＥ含量小于４０％时，ＥＶＡ对ＬＤＰＥ起稀释剂作用，促进ＨＤＰＥ、ＬＤＰＥ的晶相分离，使ＨＤＰＥ、ＬＤＰＥ单独结晶，当ＨＤＰＥ含量高于４０％时，ＬＤＰＥ片晶入进ＨＤＰＥ晶相，形成与ＬＤＰＥ在片晶水平上的共晶。     

VAPORIZATION HEAT AT NORMAL BOILING POINT AND MOLECULAR TOPOLOGY FOR PARAFFINS

ＶＡＰＯＲＩＺＡＴＩＯＮ　ＨＥＡＴ　ＡＴ　ＮＯＲＭＡＬ　ＢＯＩＬＩＮＧ　ＰＯＩＮＴ　ＡＮＤ　ＭＯＬＥＣＵＬＡＲ　ＴＯＰＯＬＯＧＹ　ＦＯＲ　ＰＡＲＡＦＦＩＮＳＶＡＰＯＲＩＺＡＴＩＯＮＨＥＡＴＡＴＮＯＲＭＡＬＢＯＩＬＩＮＧＰＯＩＮＴＡＮＤＭＯＬＥＣＵＬＡ...     

高密度聚乙烯／低密度聚乙烯／乙烯－醋酸乙烯共聚物共混体系的结晶行为

通过ＤＳＣ和ＷＡＸＤ研究了高密度聚乙烯／低密度聚乙烯／乙烯－醋酸乙烯共聚物（ＨＤＰＥ／ＬＤＰＥ／ＥＶＡ）三元共混体系的热行为和结晶性能。发现当ＨＤＰＥ含量小于４０％时，ＥＶＡ对ＬＤＰＥ起稀释剂作用，促进ＨＤＰＥ、ＬＤＰＥ的晶相分离，使ＨＤＰＥ、ＬＤＰＥ单独结晶．当ＨＤＰＥ含量高于４０％时，ＬＤＰＥ片晶进入ＨＤＰＥ晶相。形成与ＬＤＰＥ在片晶水平上的共晶。     

PARAMAGNETIC AND DIAMAGNETIC DICOPPER（Ⅱ） COMPLEXES WITH DI－SCHIFF BASE DERIVED FROM 2－HYDROXY－1－NAPHTHALDEHYDE AND1，3－DIANINO－2－PROPANOL

ＰＡＲＡＭＡＧＮＥＴＩＣＡＮＤＤＩＡＭＡＧＮＥＴＩＣＤＩＣＯＰＰＥＲ（Ⅱ）ＣＯＭＰＬＥＸＥＳＷＩＴＨＤＩ－ＳＣＨＩＦＦＢＡＳＥＤＥＲＩＶＥＤＦＲＯＭ２－ＨＹＤＲＯＸＹ－１－ＮＡＰＨＴＨＡＬＤＥＨＹＤＥＡＮＤ１，３－ＤＩＡＮＩＮＯ－２－ＰＲＯＰＡＮＯＬ...     

SCANNED LASER SPOT PHOTOCURENT RESPONSE STUDIES OF FERROCENE DERIVATIVE LB FILMS MODIFED CdSe THIN F

ＳＣＡＮＮＥＤ　ＬＡＳＥＲ　ＳＰＯＴ　ＰＨＯＴＯＣＵＲＥＮＴ　ＲＥＳＰＯＮＳＥ　ＳＴＵＤＩＥＳ　ＯＦ　ＦＥＲＲＯＣＥＮＥ　ＤＥＲＩＶＡＴＩＶＥ　ＬＢ　ＦＩＬＭＳ　ＭＯＤＩＦＥＤ　ＣｄＳｅ　ＴＨＩＮ　ＦＩＬＭ　ＥＬＥＣＴＲＯＤＥＳＳＣＡＮＮＥＤＬＡＳＥ...     

STUDY ON SOME NOVEL BIODEGRADABLE POLYPHOSPHATE ESTERS

ＳＴＵＤＹＯＮＳＯＭＥＮＯＶＥＬＢＩＯＤＥＧＲＡＤＡＢＬＥＰＯＬＹＰＨＯＳＰＨＡＴＥＥＳＴＥＲＳＳＴＵＤＹＯＮＳＯＭＥＮＯＶＥＬＢＩＯＤＥＧＲＡＤＡＢＬＥＰＯＬＹＰＨＯＳＰＨＡＴＥＥＳＴＥＲＳ￥ＬｉＪｉａｎＬＩＵ；ＲｅｎＸｉＺＨＵＯ；ＹｕａｎＺｈａｏ...     

STUDY ON THE RELATIONSHIP BETWEEN MELTING POINT AND ACID DENATURING ACIDITY OF DNA BY ULTRAVIOLET SPECTROMETER

ＳＴＵＤＹ　ＯＮ　ＴＨＥ　ＲＥＬＡＴＩＯＮＳＨＩＰ　ＢＥＴＷＥＥＮ　ＭＥＬＴＩＮＧ　ＰＯＩＮＴ　ＡＮＤ　ＡＣＩＤ　ＤＥＮＡＴＵＲＩＮＧ　ＡＣＩＤＩＴＹ　ＯＦ　ＤＮＡ　ＢＹ　ＵＬＴＲＡＶＩＯＬＥＴ　ＳＰＥＣＴＲＯＭＥＴＥＲＳＴＵＤＹＯＮＴＨＥＲＥＬＡＴ...     

THERMAL DECOMPOSITION PROCESSES OF POLYANILINE AND POLY－O－TOLUIDINE INVESTIGATED BY DIRECT PYROLYSIS MASS SPECTROMETRY

ＴＨＥＲＭＡＬＤＥＣＯＭＰＯＳＩＴＩＯＮＰＲＯＣＥＳＳＥＳＯＦＰＯＬＹＡＮＩＬＩＮＥＡＮＤＰＯＬＹ－Ｏ－ＴＯＬＵＩＤＩＮＥＩＮＶＥＳＴＩＧＡＴＥＤＢＹＤＩＲＥＣＴＰＹＲＯＬＹＳＩＳＭＡＳＳＳＰＥＣＴＲＯＭＥＴＲＹ￥ＨｏｎｇＷｅｉＸＩＥ；ＳｈｕＹｉｎｇ...     

SUSTAINED RELEASE OF LEVONORGESTREL USING POLYPHOSPHATE AS DRUG CARRIER

ＳＵＳＴＡＩＮＥＤＲＥＬＥＡＳＥＯＦＬＥＶＯＮＯＲＧＥＳＴＲＥＬＵＳＩＮＧＰＯＬＹＰＨＯＳＰＨＡＴＥＡＳＤＲＵＧＣＡＲＲＩＥＲＳＵＳＴＡＩＮＥＤＲＥＬＥＡＳＥＯＦＬＥＶＯＮＯＲＧＥＳＴＲＥＬＵＳＩＮＧＰＯＬＹＰＨＯＳＰＨＡＴＥＡＳＤＲＵＧＣＡＲＲＩＥ...     

Preparation of copoly(vinyl alcohol-styrenesulfonic acid) resin and its catalytic activity on hydrolysis of carbohydrates. III. Kinetic analysis of the catalysis

Hydrolysis of dextrin in the presence of copoly(vinyl alcohol-styrenesulfonic acid) resin was investigated kinetically. The hydrolysis rate increased nearly proportionally with increases in the concentrations of the substrate and the catalyst copolymer. This is in contrast to the results found in a similar homogeneous reaction in the presence of soluble copoly(vinyl alcohol–styrenesulfonic acid) in which the reaction rate clearly followed Michaelis–Menten type kinetics. However, the hydrolysis was inhibited by the addition of copoly(vinyl alcohol–styrene) resin or poly(vinyl alcohol). Activation parameters of the hydrolysis in the presence of the copolymer resin as catalyst were also investigated, and it was found that the enthalpy and entropy of the activation in the presence of the copolymer resin were lower than those in Amberlite 120B and slightly decreased when vinyl alcohol unit was introduced. From these results it was concluded that the poly(vinyl alcohol) sequence introduced into the insoluble catalyst copolymer resin also played an important part in the acceleration of dextrin hydrolysis in a manner similar to the case of a soluble catalyst, although the interaction with the substrate was weaker.     

以交联聚乙烯醇为载体的阴离子交换剂的合成与性能研究

大孔乙酸乙烯酯－异氰尿酸三烯丙酯共聚物树脂经醇解生成亲水性的交联聚乙烯醇，然后相继与环氧氯丙烷和二乙胺反应，合成出含二乙基氨基羟丙基的阴离子交换剂，研究了交联聚乙烯醇环氧基化的最佳条件，发现以二甲基亚砜作溶剂能够显著地提高活化程度，反应时间以３ｈ为最佳，并研究了该阴离子交换剂的交换量、亲水性、热稳定性、溶胀稳定性，发现它具备常压分离蛋白质所需的基本性能，是较为理想的生化用的离子交换剂。     

IMMOBILIZED CIBACRON BLUE F3G-A ON CROSSLINKED POLY (VINYL ALCOHOL) FOR AFFINITY CHROMATOGRAPHY

Immobilized triazine dye affinity chromatography has been widely used for protein purification. In this paper, cibacron Blue F3G-A was immobilized,through a spacer arm, onto a rigid hydrophilic porous polymer by reacting an epoxy-group-containing poly(vinyl alcohol) with 6-aminohexyl-N'-Cibacron Blue F3G-A,which was obtained by reacting Cibacron Blue F3G-A with excess of 1,6-diaminohexane, in a pH 8.6 buffer. The epoxy-group-containing poly(vinyl alcohol) was prepared by hydrolysis of macroporous crosslinded poly(vinyl acetate),which was synthesized by suspension copolymerization of vinyl acetate and triallyl isocyanurate in the presence of butyl acetate and n-heptane as diluents. The cibacron Blue F3G-A-immobilized poly(vinyl alcohol)was packed in a stainless steel column (250×5 mm I. D.) and the chromatographic behaviors of several proteins (cytochrome c, lysozyme, bovine serum albumin, insulin, and lactate dehydrogenase) were determined.     

Novel method for preparation of photocrosslinkable poly(vinyl alcohol)

A convenient procedure to prepare photosensitive poly(vinyl alcohol) by acetalization with 1-methyl-4-(p-formylstyryl)pyridinium methosulfate in heterogeneous condition is described. The reaction of fully saponified poly(vinyl alcohol) was carried out in suspension in acidic aqueous solution, while partially saponified poly(vinyl alcohol) was acetalized in acidic aqueous organic solvent. The photosensitive poly(vinyl alcohol) thus prepared was purified by filtration and successive washing out with methanol. The effect of the preparative condition on the electronic absorption spectra of the styrylpyridinium group attached to poly(vinyl alcohol) is discussed.     

Preferential sorption of modified PVA membrane in pervaporation

The swelling processes of an annealed poly(vinyl alcohol) membrane, a NaOH-crosslinked poly(vinyl alcohol) membrane, a poly(vinyl alcohol)-N,N′-methylene bisacrylamide irradiation-crosslinked membrane and a poly(vinyl alcohol)/poly (AMcoAANa) blend membrane were investigated. Water was preferentially sorbed by all four membranes. The selective sorption factor ^s and the selective diffusion factor ^d were defined, and were used to characterize the effects of sorption and diffusion on selectivity. The results have shown that preferential sorption has a marked effect on selectivity. The mean diffusion coefficients and pervaporation properties of the four membranes are also discussed.     

羧甲基壳聚糖/聚乙烯醇/甘油环氧树脂蛇笼型复合螯合膜的制备及对金属离子的吸附性能

以交联甘油环氧树脂交联的聚乙烯醇(PVA)为笼树脂，羧甲基壳聚糖(CCTS)为蛇树脂制备了具有蛇笼结构的复合螯合膜，研究了其对Cu^2 、Ni^2 、Pb^2 、Fe^3 、Zn^2 ，Hg”^2 、Cd^2 等金属离子的吸附性能，研究表明，该树脂对Cu^2 、Ni^2 、Pb^2 有较好的吸附性能，其中PVA是对Cu^2 的吸附的主要贡献者，而CCTS则是在对Ni^2 的吸附中起主要作用。该树脂可以用于含Cu^2 废水的处理。     

Statistical Chain Dimensions of Poly (vinyl acetal)-Type Molecules

Acetalization of poly(vinyl alcohol) molecules results in acetal ring formation between two successive hydroxyl groups. This will dominate the chain stiffness of poly(vinyl acetal) in different ways, depending on the stereospecificity of poly(vinyl alcohol) used as the starting material. The present paper first deals with calculations of statistical dimensions of hypothetical poly(vinyl acetal) chains with a 100% degree of substitution and different stereospecificities (isotacticity and syndiotacticity). The calculations are essentially identical with those made by Wall and Markovitz, but recent stereochemical knowledges of the acetal ring and poly(vinyl alcohol) are taken into account. The results show that the chain dimension of poly-(vinyl acetal) chain derived from isotactic poly(vinyl alcohol) is much larger than that of poly(vinyl acetal) derived from the syndiotactic one. The treatment used above is extended to more realistic chains that have any degree of stereoregularity and of substitution. As has been anticipated intuitively, it is ascertained that the chain dimensions increase with increase in the degree of substitution for each stereospecificity.     

Studies of reactions with polymers. V. The reaction mechanism and resultant structure of PVA with PAN in DMSO without any catalyst

The reaction of polyacrylonitrile with poly(vinyl alcohol) in dimethyl sulfoxide without any catalyst was studied, and it showed that the adjacent nitrile groups on polyacrylonitrile could be linked up to form conjugated carbon-nitrogen sequence by the presence of poly(vinyl alcohol). However, no such reaction occurred when poly(vinyl alcohol) was replaced by i-propanol or poly(vinyl alcohol) graft copolymers. The structure of the resulting polymers were proposed by means of IR, UV, ¹H, and ¹³C-NMR spectroscopies. On the basis of the results, the effect of polymer feed and polymerization condition on this reaction were discussed. The compositions were determined by elemental analysis. The viscosity and thermal analysis of the products were also determined. At feed weight ratios of poly(vinyl alcohol) to polyacrylonitrile above one-half, gels were obtained.     

Areas of Local Inelasticity and Relaxation Phenomena in Poly(vinyl formal)

A comparative analysis of relaxation transitions observed in the internal friction spectra of poly(vinyl alcohol) and poly(vinyl formal) synthesized on its basis is presented. Two distinct peaks (α and β) of dissipative losses are revealed within the temperature range from–150 to +120°C. The time of acetylation of poly(vinyl alcohol) in the production of poly(vinyl formal) affects the characteristics of relaxation phenomena in poly(vinyl formal). A structural justification of change in the relaxation characteristics in poly(vinyl formal) is given according to the internal friction spectra and IR spectra.     

Sensor for free fatty acids based on acyl coenzyme-a synthetase and acyl coenzyme-a oxidase

The measurement is based on monitoring dissolved oxgyen consumed by the two sequential reactions catalyzed by the enzymes immobilized in photo-cross-linkable poly (vinyl alcohol) resin (PVA-SbQ). A linear correlation was observed between current decrease and 0.3–2.6 mM oleic or palmitic acid. The sensor was stable in use for three days and could be used to monitor the freshness of oily food.