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chemical nucleation
相关语句
  化学成核
     STUDIES ON THE MECHANISM OF CHEMICAL NUCLEATION OF POLY(ETHYLENE TEREPHTHALATE)
     聚对苯二甲酸乙二酯的化学成核机理
短句来源
     CHEMICAL NUCLEATION OF CARBOXYLIC SALT NUCLEATING AGENT IN POLY(ETHYLENE 2,6-NAPHTHALATE)
     羧酸盐类成核剂在聚2,6-萘二甲酸乙二酯中的化学成核
短句来源
     It is also found that the Avrami exponent of the isothermal crystallization of PET is around 3 for both the unnucleated or nucleated PET. Therefore it is suggested that the chemical nucleation caused by metal carboxylate nucleating additives is heterogenous in nature.
     并从等温结晶的Avrami指数均为3左右,说明金属羧酸盐类成核添加剂所引起的化学成核是三维异相成核。
短句来源
     Therefore,the chemical nucleation mechanism of carboxylic acid alkali salts in PEN was proposed.
     因而提出羧酸盐类成核剂在PEN中的成核是“化学成核” .
短句来源
     the constant crystalization rate increases. Macromolecule nucleation agents and multiplex necleation agents improve PET crystallization behavior greatly,and their nucleation mechanism is chemical nucleation,but macromolecule necleation agents don′t cause the degradation of PET chains.
     其中高分子成核剂、复合成核剂对PET结晶行为改善效果更好,其成核机理为化学成核,但高分子成核剂不会造成PET分子链的降解。
短句来源
  相似匹配句对
     Mechanism of Diamond Nucleation upon Chemical Vapor Deposition
     化学气相沉积金刚石薄膜成核机理研究
短句来源
     STUDIES ON THE MECHANISM OF CHEMICAL NUCLEATION OF POLY(ETHYLENE TEREPHTHALATE)
     聚对苯二甲酸乙二酯的化学成核机理
短句来源
     Chemical Sensors
     化学量传感器 第五讲 生物传感器 七 生物传感器的应用
短句来源
     Chemical Sensors
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短句来源
     ON THE NUCLEATION OF SYNTHETIC DIAMOND
     金刚石合成中的成核问题
短句来源
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  chemical nucleation
Then recently developed methods of reactive molecular dynamics are used to study chemical nucleation in a simple model chemical reaction.
      


The effects of three kinds of metal carboxylate nucleating additives on the crystallization, nucleation and molecular weight of poly(ethylene terephthalate)(PET) were studied by differential scanning calorimetry (DSC) , viscosity measurement and high performance gel permeation chromatograpgy (HPGPC) . It is found that there are chemical reactions between nucleating additives and PET in the melt state, resulting in the change of molecular weight and crystallization rate of PET in some degree. In the case of acetates...

The effects of three kinds of metal carboxylate nucleating additives on the crystallization, nucleation and molecular weight of poly(ethylene terephthalate)(PET) were studied by differential scanning calorimetry (DSC) , viscosity measurement and high performance gel permeation chromatograpgy (HPGPC) . It is found that there are chemical reactions between nucleating additives and PET in the melt state, resulting in the change of molecular weight and crystallization rate of PET in some degree. In the case of acetates with different metal ions, the lower the electronegativity of the metal ion, the faster is the crystallization rate of PET when the metal ions are of approximate same radius. In the case of sodium alkyl acetates with different alkyl chain length, the longer the alkyl chain, the faster is the crystallization rate of PET. In the case of the sodium benzoates with different substituted groups, the crystallization rate of PET is related to the dissociation constant and solubility parameter of the substituted benzoates. It is also found that the Avrami exponent of the isothermal crystallization of PET is around 3 for both the unnucleated or nucleated PET. Therefore it is suggested that the chemical nucleation caused by metal carboxylate nucleating additives is heterogenous in nature.

用差示扫描量热仪(DSC)、高效凝胶色谱仪(HPGPC)和粘度法研究了三种不同类型的金属羧酸盐类成核添加剂对聚对苯二甲酸乙二酯(PET)的结晶、成核和分子量的影响。结果表明,由于成核添加剂与PET之间在熔融态下存在化学反应,导致PET有不同程度的分子量下降,同时PET结晶速率发生变化。对不同金属离子的醋酸盐,在金属离子半径相近的条件下,随金属离子电负性下降,PET结晶速率加快;对不同烷基长度的脂肪族羧酸钠盐,烷基分子链越长,PET结晶速率越快;对不同取代基的苯甲酸钠盐,其相应的酸解离常数和溶度参数与PET的结晶速率有一定的内在联系。并从等温结晶的Avrami指数均为3左右,说明金属羧酸盐类成核添加剂所引起的化学成核是三维异相成核。

The behaviour of metal carboxylate nucleating additives in the melt of poly(ethylene terephthalate) (PET) was observed by hot-stage polarized light micro-scopy. The formation of PET metal ion salt was indicated by the study of Fouriortransfer infrared spectroscopy (FTIR). The aggregation of this polymer metalion salt was studied by means of transmission electron microscopy and FTIR. Themechanizm of chemical nucleation of PET were preliminary explained.

用热台偏光显微镜观察羧酸盐类成核添加剂在聚对苯二甲酸乙二酯(PET)熔体中的行为,并用傅立叶变换红外光谱仪(FTIR)跟踪观察PET羧酸盐的形成。通过透射电镜和FTIR等仪器,对该聚合物金属离子盐的聚集进行了研究,初步阐明了化学成核机理。

Dimethyl 2,6-naphthalate (DMN) and sodium of o-chlorobenzoate (SOCB) were used as model compounds to simulate the chemical reaction between poly(ethylene naphathalate) (PEN) and carboxylic acid alkali salt;and the reaction was studied by using DSC,polarized optical microscopy with a hot-stage (HPOM),Fourier transform infrared spectrometry(FTIR) and high performance liquid chromatography (HPLC).By means of DSC and HPOM,the reaction between PEN and SOCB was also proved at high temperature.Therefore,the chemical...

Dimethyl 2,6-naphthalate (DMN) and sodium of o-chlorobenzoate (SOCB) were used as model compounds to simulate the chemical reaction between poly(ethylene naphathalate) (PEN) and carboxylic acid alkali salt;and the reaction was studied by using DSC,polarized optical microscopy with a hot-stage (HPOM),Fourier transform infrared spectrometry(FTIR) and high performance liquid chromatography (HPLC).By means of DSC and HPOM,the reaction between PEN and SOCB was also proved at high temperature.Therefore,the chemical nucleation mechanism of carboxylic acid alkali salts in PEN was proposed.Carboxylic acid alkali salt reacts with the ester linkages of PEN at high temperature and PEN ionic chain-ends were produced.The ionic chain-ends act as a true nucleating agent to improve the crystallization rate of PEN.

采用与PEN分子结构单元相似的 2 ,6 萘二甲酸二甲酯 (DMN)和熔点较低的邻氯苯甲酸钠 (SOCB)为模型化合物 ,用DSC、FTIR、带热台偏光显微镜 (HPOM)和HPLC等方法 ,研究了DMN和SOCB在热处理过程中的化学反应 .DSC和HPOM研究也证明了PEN与SOCB在高温下发生化学反应 .因而提出羧酸盐类成核剂在PEN中的成核是“化学成核” .即在高温下羧酸盐类成核剂和PEN发生化学反应 ,生成PEN的羧端基离子盐 ,该离子盐是真正的成核剂 ,起到成核作用

 
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