聚β-羟基丁酸酯/聚醋酸乙稀酯共混物结晶行为的研究

以ＤＳＣ，ＰＯＭ，ＷＡＸＤ实验方法研究了聚β－羟基丁酸酯／聚醋酸乙稀酯（ＰＨＢ／ＰＶＡｃ）共混体系的结晶行为。结果表明：随共混物中非晶组份ＰＶＡｃ含量的增加，ＰＨＢ结晶的活化能增大。用Ａｖｒａｍｉ方程处理实验数据，结果表明ＰＶＡｃ的加入对ＰＨＢ结晶的生长方式影响不大，但结晶速率却明显下降。ＷＡＸＤ实验表明，ＰＶＡｃ的加入不影响ＰＨＢ的结晶结构，但微晶尺寸和结晶度却明显变小。偏光显微镜观察结果与ＤＳＣ实验结果基本一致。     

ASSIGNMENT OF ~(13)C-NMR SPECTRA OF POLYMER WITH SEMIEMPIRICAL METHOD——A STUDY OF VINYL TERTIARY CARBON IN 1,2-POLYBUTADIENE (1,2-PBD)

Matrix multiplication technique has been employed to calculate the probabilities of different rotational isomeric states of the bonds in the main chains of 1, 2-PBD. Using the relation that relative chemical shift is in proportion to the sum of bond probabilities which make contribution to the chemical shift of a certain carbon, a new assignment has been obtained directly from the sum of bond probabilities. According to the assignment, these pentads are mmmm, mmmr, rmmr, mmrr, mmrm, rmrr, rmrm, rrrr, mrrr and mrrm from downfield to upfield.In order to prove experimentally the result mentioned above, isotactic 1,2-PBD was successfully synthesized in our lab. The polymer is identified by the infrared spectroscopy, X-ray diffraction and differential scanning calorimetry. Comparison between the ~(13)C-NMR spectra of heterotactic and isotactic 1,2-PBD reveals that the first peak downfield in the former represents the pentad mmmm. Consequently, the assignment is in agreement with neither that of Elgert nor th     

聚丙烯／氯化聚乙烯共混物的形态结构

 用透射电子显微镜方法研究了聚丙烯（ｉＰＰ）和氯化聚乙烯（ＣＰＥ）共混物溶液浇铸膜的形态结构．共混物中ＣＰＥ含量≤７０％时不妨碍ｉＰＰ球晶两种结构（交叉结构和条状结构）区域的生成．在ＣＰＥ含量≥８０％时，分散相ｉＰＰ形成近乎直角（８０°）交叉的稀疏的片晶网络．在共混物的全组成范围内，ＣＰＥ结晶在ｉＰＰ片晶上附生生长，二者结晶Ｃ轴的交角为５０°     

HDPE/iPP共混物中的附生结晶

本文用透射电子显微术、电子衍射和重金属投影等方法研究了溶液浇铸的HDPE/iPP共混物超薄膜中奇特的结晶形态,这种奇特的结晶形态是由于HDPE在iPP上异相附生生长造成的,二者的接触面为(010)_(ipp)和(100)_(HDPE),链轴间的夹角为iPP单斜角的一半(约50°),HDPE在iPP的两种结构(十字交叉结构和单晶型结构)区域中的生长方式有很大差别,依据结构分析提出两种片晶附生生长模型。     

酞侧基聚芳醚砜的核磁共振研究──PES－C的氢谱归属及碳谱峰的确认

用１３Ｃ－ＮＭＲ谱和二维异核化学位移相关谱（ＨＥＴＣＯＲ）归属了酞侧基聚芳醚砜（ＰＥＳ－Ｃ）的１Ｈ－ＮＭＲ谱峰，并经二维同核化学位移相关谱（ＣＯＳＹ）验证．对原１３Ｃ－ＮＭＲ谱峰归属作了部分修正．二维同核及异核相关谱为ＰＥＳ－Ｃ的碳、氢核磁谱峰归属提供了重要信息．由ＰＥＳ－Ｃ的核磁谱图可见其链结构的规整性     

丙烯酸丁酯－苯乙烯－丙烯腈共聚物的结构与力学性能

丙烯酸丁酯－苯乙烯－丙烯腈共聚物的结构与力学性能张会轩，韩业，张会良，冯之榴（吉林工学院化工系长春１３００１２）（中国科学院长春应用化学研究所长春）关键词ＡＳＡ，乳液聚合，粒子，力学性能丙烯酸丁酯－苯乙烯－丙烯腈共聚物（ＡＳＡ）是两相结构，聚丙烯酸丁...     

聚丙烯／氯化聚乙烯共混物的形态结构

用透射电子显微镜方法研究了聚丙烯（ｉＰＰ）和氯化聚乙烯（ＣＰＥ）共混物溶液浇铸膜的形态结构．共混物中ＣＰＥ含量≤７０％时不妨碍ｉＰＰ球晶两种结构（交叉结构和条状结构）区域的生成．在ＣＰＥ含量≥８０％时，分散相ｉＰＰ形成近乎直角（８０°）交叉的稀疏的片晶网络．在共混物的全组成范围内，ＣＰＥ结晶在ｉＰＰ片晶上附生生长，二者结晶Ｃ轴的交角为５０°     

含有机硅三元多嵌段共聚物的研究──Ⅲ．不同硬段、半硬段对含有机硅三元多嵌段共聚物性能的影响

以双酚Ａ聚砜或酚酞作为硬段，聚对羟基苯乙烯、酚醛、聚羟基醚或聚羟基醚砜作为半硬段，聚二甲基硅氧烷作为软段合成了七种三元多嵌段共聚物，并对其稳定性、动态力学性能进行了比较详细的研究。结果表明这类共聚物在溶液中的稳定性及热稳定性主要与半硬段有关；它们的形态结构同属于微相分离，并在很宽的温度范围内表现出优良的弹性体性质。三元多嵌段共聚物中硬段与半硬段的相容性直接影响其力学性能，当两者的相容性好时，其强度高于对应的二元多嵌段共聚物。     

线型聚芳醚砜-聚醚氨酯嵌段共聚物的合成及其结构性能的初步探讨

<正> 具有抗凝血性和其它一些特殊性能的聚醚氨酯嵌段聚合物,最近颇受注视。本文以异氰酸酯的氢转移加成聚合反应为主的合成方法,在聚合物的主链中引入具有一定结构的其它链段组份,合成了一类新的线型聚芳醚砜-聚醚氨酯嵌段共聚物。并就其结构与性能的关系进行了初步探讨。     

A DYNAMIC MECHANICAL ANALYSIS STUDY OF THE TRANSITION BEHAVIOUR OF I-PP/EPDM BLENDS

The transition behaviour of the blends of isotactic polypropylene (i-PP) with ethylene-propylene terpolymer (EPDM) containing 42 wt% propylene was investigated by dynamic mechanical analysis technique (DMA). Owing to its high propylene content, EPDM is compatible with i-PP to some degree. The interaction between the two components was strengthened. As expected, for partially compatible system the glass transition temperature of i-PP in the blends shifted to lower temperature. It was found that there existed two transitions, αEPDM and βEPDM, for the EPDM used in this work. The former was considered to be the glass transition of the random chain segments of EPDM, while the latter the local motion of the long ethylene sequences in EPDM. The unusual transition behaviour of αEPDM in the blends was explained in terms of the greater thermal expansion of EPDM and the compatibility of the two components. On the other hand, the βEPDM changed with the composition of the blends in a regular manner.