Journal of Polymer Science. Part B, Polymer Physics最新文献

英文中文

Aggregation and disaggregation of Aeromonas gum in an aqueous solution under different conditions 不同条件下胶气单胞菌在水溶液中的聚集和分解

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-10-15 DOI: 10.1002/1099-0488(20001015)38:20<2644::AID-POLB40>3.0.CO;2-#

Xiaojuan Xu, Lina Zhang

The aggregation and disaggregation ofAeromonas (A) gum, an acidic heteropolysaccharide, were investigated by viscometry, a fluorescent probe, and gel permeation chromatography combined with laser light scattering techniques in aqueous solutions containing desired NaCl at different temperatures. The A gum had a strong tendency of aggregation and high viscosity in the aqueous solutions. The weight-average molecular weight, z-average radius of gyration, weight-average molar number (w ag ), and apparent aggregation number (N ap ) of the aggregates were investigated and discussed. The results indicated that there were three regions that corresponded to three kinds of aggregates and two transition temperatures at about 35 and 75 °C in the disaggregation course. When the temperature was higher than 75 °C, the w ag hardly changed, and there was still a certain amount of aggregates even at 100 °C, indicating that the aggregates were difficult to disrupt completely. Moreover, the aggregation was thermally irreversible. Decreasing polysaccharide concentration reduced the content of the aggregate. However, N ap remained constant around 20, independent of the polysaccharide concentration in a 0.5 M NaCl aqueous solution at 25 °C. At a salt concentration greater than or equal to 0.05 M, the aggregation was almost independent of the salt concentration used here.

采用粘度法、荧光探针法、凝胶渗透色谱法和激光散射技术，研究了酸性杂多糖气单胞菌(A)胶在不同温度下的聚集和分解过程。A胶在水溶液中具有较强的聚集倾向和较高的粘度。研究了聚集体的质量-平均分子量、z-平均旋转半径、质量-平均摩尔数(wag)和表观聚集数(N ap)。结果表明:在分解过程中，有3个区域对应3种团聚体，有2个转变温度分别在35℃和75℃左右。当温度高于75℃时，w变化不大，即使在100℃时仍有一定量的团聚体存在，说明团聚体难以完全破坏。此外，这种聚集是热不可逆的。多糖浓度的降低降低了骨料的含量。而在25℃下0.5 M NaCl水溶液中，N - ap保持恒定在20左右，与多糖浓度无关。当盐浓度大于或等于0.05 M时，聚集几乎与本文使用的盐浓度无关。

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引用次数: 9

Solid‐state NMR study of cyclo‐olefin copolymer (COC) 环烯烃共聚物(COC)的固体核磁共振研究

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-10-01 DOI: 10.1002/1099-0488(20001001)38:19<2554::AID-POLB70>3.0.CO;2-#

Wu-Jang Huang, F. Chang, P. P. Chu

In this article, we have applied solid-state 13C NMR techniques, cross-polarization/magic-angle spinning (CP/MAS), and single-pulse 13C NMR to characterize the NB conformation of the cyclo-olefin copolymer. The copolymers containing higher NB contents produce more NB blocks according to 13C CP/MAS spectral analysis. In addition, NB-dyad-based conformations are able to induce peak splitting in the region of 49–52 ppm. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2554–2563, 2000

引用次数: 8

Interfacial tension and acid‐base approaches to polymer interactions 聚合物相互作用的界面张力和酸碱方法

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-08-15 DOI: 10.1002/1099-0488(20000815)38:16<2096::AID-POLB30>3.0.CO;2-#

Hua-Ming Liang, R. Xu, B. Favis, H. Schreiber

A significant correlation has been shown to exist between the interfacial tension of polymer pairs and their acid-base pair interaction. The relationship is inverse, with interfacial tensions decreasing as acid-base interactions increase. Interfacial tensions, frequently used as an indicator of polymer compatibility, were measured by the breaking thread method at temperatures in the vicinity of 200 °C. Acid-base pair interaction values were measured by inverse gas chromatography over wide temperature ranges. The observed correlation confirms the important contribution made by short-range, acid-base interactions to the observed value of interfacial tension and supports the prediction of equations based on fundamental definitions of surface forces. A collateral finding of this work is the decrease of acid-base functionality with rising temperature for all polymers studied. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2096–2104, 2000

聚合物对的界面张力与其酸碱对相互作用之间存在显著的相关性。这种关系是相反的，随着酸碱相互作用的增加，界面张力降低。界面张力通常被用作聚合物相容性的指标，在200℃左右的温度下，通过断丝法测量了界面张力。在较宽的温度范围内，用反相色谱法测定了酸碱对相互作用值。观察到的相关性证实了短程酸碱相互作用对界面张力观测值的重要贡献，并支持基于表面力基本定义的方程预测。这项工作的一个附带发现是，随着温度的升高，所有聚合物的酸碱功能都在下降。©2000 John Wiley & Sons, Inc[J] .高分子材料学报，2001,19 (3):559 - 564

引用次数: 13

Miscibility, crystallization kinetics, and morphology of poly(?-hydroxybutyrate) and poly(methyl acrylate) blends 聚羟基丁酸酯和聚丙烯酸甲酯共混物的混相、结晶动力学和形貌

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-07-15 DOI: 10.1002/1099-0488(20000715)38:14<1860::AID-POLB40>3.0.CO;2-#

Y. An, Li-song Dong, Guang-Ke Li, Z. Mo, Zhiliu Feng

The miscibility, spherulite growth kinetics, and morphology of binary blends of poly(β-hydroxybutyrate) (PHB) and poly(methyl acrylate) (PMA) were studied with differential scanning calorimetry, optical microscopy, and small-angle X-ray scattering (SAXS). As the PMA content increases in the blends, the glass-transition temperature and cold-crystallization temperature increase, but the melting point decreases. The interaction parameter between PHB and PMA, obtained from an analysis of the equilibrium-melting-point depression, is −0.074. The presence of an amorphous PMA component results in a reduction in the rate of spherulite growth of PHB. The radial growth rates of spherulites were analyzed with the Lauritzen–Hoffman model. The spherulites of PHB were volume-filled, indicating the inclusion of PMA within the spherulites. The long period obtained from SAXS increases with increased PMA content, implying that the amorphous PMA is entrapped in the interlamellar region of PHB during the crystallization process of PHB. All the results presented show that PHB and PMA are miscible in the melt. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 1860–1867, 2000

采用差示扫描量热法、光学显微镜和小角度x射线散射(SAXS)研究了聚β-羟基丁酸酯(PHB)和聚丙烯酸甲酯(PMA)二元共混物的混相、球晶生长动力学和形貌。随着共混物中PMA含量的增加，玻璃化转变温度和冷结晶温度升高，但熔点降低。PHB与PMA的相互作用参数为- 0.074，由平衡熔点下降分析得到。无定形PMA组分的存在降低了PHB的球晶生长速率。用Lauritzen-Hoffman模型分析了球晶的径向生长速率。PHB的球晶充满体积，表明球晶中含有PMA。SAXS测得的长周期随PMA含量的增加而增加，说明在PHB结晶过程中，无定形PMA被包裹在PHB的层间区。结果表明，PHB和PMA在熔体中存在混相。©2000 John Wiley & Sons, Inc[J]生物质化学工程学报，2009,31 (2):559 - 567

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引用次数: 23

Heat capacity and thermodynamic functions of crystalline poly(p-phenylenebenzobisoxazole), the synthetic polymer with the highest Young's modulus † 杨氏模量†最高的合成聚合物聚对苯基苯并苯异恶唑晶体的热容量和热力学函数

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-06-15 DOI: 10.1002/(SICI)1099-0488(20000615)38:12<1584::AID-POLB20>3.0.CO;2-#

Kazuya Saito, Yasuhiro Takahashi, M. Sorai

The heat capacity of crystalline poly(p-phenylenebenzobisoxazole) was measured below room temperature by adiabatic calorimetry. The standard thermodynamic functions (enthalpy, entropy, and Gibbs energy) were established and tabulated. The temperature dependence of the heat capacity was compared with those of polyethylene and poly(p-phenylene), with attention paid to the low dimensionality of the systems. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 1584–1588, 2000

引用次数: 4

Transport properties of chitosan membranes: Influence of crosslinking 壳聚糖膜的传输性能:交联的影响

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-06-01 DOI: 10.1002/(SICI)1099-0488(20000601)38:11<1521::AID-POLB120>3.0.CO;2-#

C. Tual, E. Espuche, M. Escoubes, A. Domard

A chitosan film with acetylation degree close to 2% was crosslinked with glutaraldehyde. The consequences of this chemical modification were studied on the polymer gas and water transport properties. The crystalline domains were not affected by the crosslinking reaction and the modification of the amorphous phase did not induce variation of the gas permeability at anhydrous state. A crosslinking of 5 h, leading to a theoretical amine conversion of 60% in the amorphous phase induced only small changes of the polymer water sorption capacity at relative pressures less than 0.5. The main modification of the transport properties induced by this treatment occurred at a relative pressure equal to one with a significant reduction of the water sorption and water permeation and with the impossibility to measure the gas permeability coefficient in these conditions due to the brittleness of the membrane. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 1521–1529, 2000

用戊二醛交联制备了乙酰化度接近2%的壳聚糖膜。研究了化学改性对聚合物气体和水输运性能的影响。交联反应不影响晶域，非晶相的改性不影响无水状态下气体渗透率的变化。在相对压力小于0.5的情况下，交联5h，导致非晶相的理论胺转化率为60%，仅引起聚合物吸水能力的微小变化。这种处理引起的输运性质的主要改变发生在一个相对压力下，这个相对压力等于一个吸水率和渗透率显著降低的压力，并且由于膜的脆性，在这些条件下不可能测量透气系数。©2000 John Wiley & Sons, Inc[J] .高分子材料学报，2003,19 (3):521 - 529

引用次数: 123

Tack properties of pressure-sensitive adhesives 压敏胶粘剂的粘性特性

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-05-01 DOI: 10.1002/(SICI)1099-0488(20000501)38:9<1201::AID-POLB12>3.0.CO;2-#

P. Tordjeman, E. Papon, J. Villenave

Relevant experiments are essential to clearly understand the role of various molecular (chemical structure, surface energy, composition), experimental (contact time, contact pressure, temperature) or topological (sample roughness and thickness) parameters, on the tack properties of pressure sensitive adhesives (PSA). The “mechano-optical tack tester” (MOTT) is a novel device that we have developed to provide accurate measurements of both the contact area and the tack strength. The MOTT is designed to apply controlled contact pressures by mean of a quartz prism probe, for determined contact times, onto the surface of PSA samples. The probe is then pulled up at controlled rates while the tearing force (tack strength) and the contact area are plotted versus time. The tack energy is then calculated. Using the MOTT, the influence of various parameters (contact pressure, contact area, sample thickness, …) on the tack properties of PSA samples has been studied. The main result lies in the strong dependence of the tack energy on the sample thickness. This points out that the release energy is close to the interface rather than in the bulk of the PSA films, and is a function of the contact area. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 1201–1208, 2000

相关实验对于清楚地了解各种分子(化学结构、表面能、组成)、实验(接触时间、接触压力、温度)或拓扑(样品粗糙度和厚度)参数对压敏胶粘剂(PSA)粘接性能的作用至关重要。“机械光学粘性测试仪”(MOTT)是我们开发的一种新型设备，可以提供接触面积和粘性强度的精确测量。MOTT设计用于通过石英棱镜探头控制接触压力，确定接触时间，到PSA样品表面。然后以控制的速率将探针拉起，同时绘制撕裂力(粘性强度)和接触面积随时间的变化。然后计算出粘性能。利用MOTT技术，研究了不同参数(接触压力、接触面积、试样厚度等)对PSA试样粘接性能的影响。主要结果在于黏着能对试样厚度有很强的依赖性。这表明释放能量靠近界面而不是在PSA膜的主体中，并且是接触面积的函数。©2000 John Wiley & Sons, Inc[J]生物质化学工程学报，2009,31 (2):391 - 398

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引用次数: 48

Tube dilation process in star-branched cis-polyisoprenes 星形支链顺式聚异戊二烯的管状膨胀过程

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-04-15 DOI: 10.1002/(SICI)1099-0488(20000415)38:8<1024::AID-POLB3>3.0.CO;2-#

H. Watanabe, Yumi Matsumiya, K. Osaki

In current tube models for entanglement, the tube representing the topological constraint is considered to move with time. This tube motion results in the constraint release (CR) as well as the dynamic tube dilation (DTD), and an importance of DTD has been argued for entangled star chains. Under these backgrounds, this article examines the validity of the DTD molecular picture for the star chains. For monodisperse star chains having noninverted type-A (parallel) dipoles in respective arms, the normalized viscoelastic and dielectric relaxation functions μ(t) and Φ(t) were found to obey a relationship μ(t) ≅ [Φ(t)]2 if the tube actually dilates in the time scale of the star relaxation. For 6-arm star cis-polyisoprene (PI) chains (having those type-A dipoles), dielectric and viscoelastic measurements were conducted to test this DTD relationship. Both viscoelastic and dielectric properties exhibited characteristic behavior expected from DTD models (assuming the arm retraction in the dilating tube), the exponential increase of the relaxation time and broadening of the relaxation mode distribution with increasing arm molecular weight Ma. However, in the range of Ma examined, Ma ≤ 8Me (Me = entanglement spacing), the above DTD relationship was not valid for a dominant part of the slow relaxation (and the models failed in this sense). Thus, for star chains at least in this range of Ma, the simple DTD picture assuming very rapid CR motion (rapid equilibration in the dilated tube) did not explain the slow relaxation behavior of star chains. This result in turn suggested the importance of the CR motion in this behavior. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 1024–1036, 2000

在当前的纠缠管模型中，表示拓扑约束的管被认为是随时间移动的。这种管状运动导致约束释放(CR)和动态管状膨胀(DTD)， DTD在纠缠星链中具有重要意义。在此背景下，本文对星链DTD分子图谱的有效性进行了验证。对于各自臂上具有非倒a型(平行)偶极子的单分散星链，如果管在星弛豫的时间尺度上实际膨胀，则归一化粘弹性和介电弛豫函数μ(t)和Φ(t)服从μ(t) = [Φ(t)]2。对于6臂星形顺式聚异戊二烯(PI)链(具有a型偶极子)，进行了介电和粘弹性测量来测试这种DTD关系。粘弹性和介电性能均表现出DTD模型所期望的特征行为(假设臂在膨胀管中收缩)，松弛时间呈指数增长，松弛模式分布随着臂分子量Ma的增加而展宽。然而，在Ma范围内，Ma≤8Me (Me =纠缠间距)，上述DTD关系对于大部分慢弛豫不成立(模型在这个意义上失败了)。因此，对于至少在这个Ma范围内的星链，简单的DTD图假设非常快速的CR运动(膨胀管中的快速平衡)并不能解释星链的缓慢弛豫行为。这一结果反过来表明了CR运动在这种行为中的重要性。©2000 John Wiley & Sons, Inc[J] .高分子材料学报，2003,19 (3):559 - 564

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引用次数: 19

Transition metal compatibilization of poly(vinylamine) and poly(ethylene imine) In memory of Olive M. Belfiore on the 88th anniversary of her birth. 聚(乙烯胺)和聚(乙烯亚胺)过渡金属的相容性纪念Olive M. Belfiore诞辰88周年。

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-02-15 DOI: 10.1002/(SICI)1099-0488(20000215)38:4<552::AID-POLB7>3.3.CO;2-5

L. Belfiore, Erik M. Indra

引用次数: 0

Reversible and irreversible heat capacity of poly(trimethylene terephthalate) analyzed by temperature-modulated differential scanning calorimetry This article is a U.S. Government work and, as such, is in the public domain in the United States of America. 用温度调制差示扫描量热法分析聚对苯二甲酸三甲酯的可逆和不可逆热容量本文是美国政府的一项工作，因此在美利坚合众国属于公共领域。

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics

Pub Date : 2000-02-15 DOI: 10.1002/(SICI)1099-0488(20000215)38:4<622::AID-POLB14>3.3.CO;2-L

M. Pyda, B. Wunderlich

引用次数: 4

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Journal of Polymer Science. Part B, Polymer Physics

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