EFFECT OF HYDROGEN-BONDING AND IONIC AGGREGATION ON MELT RHEOLOGY OF AN ETHYLENE-METHACRYLIC ACID COPOLYMER AND ITS SODIUM SALT
EFFECT OF HYDROGEN-BONDING AND IONIC AGGREGATION ON MELT RHEOLOGY OF AN ETHYLENE-METHACRYLIC ACID COPOLYMER AND ITS SODIUM SALT
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DOI：
10.1002/pol.1978.180160113
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发表时间：
1978-01-01
影响因子：
--
通讯作者：
MACKNIGHT, WJ
中科院分区：
文献类型：
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作者：
EARNEST, TR;MACKNIGHT, WJ
研究了乙烯-甲基丙烯酸共聚物、其甲酯和70%中和钠盐的动态和稳态剪切熔体流变学。使用Rheometrics机械光谱仪进行测量，使用偏心旋转盘和锥板几何形状，温度范围为120-180°C，频率范围为10− 3至102 rad/sec。酯和酸材料的稳态剪切粘度和复数动态粘度之间存在对应关系。在所研究的温度和频率范围内，时间-温度叠加原理适用于每个导数的G′数据，并且可以从三个单独的主曲线构建超级主曲线。发现时间-温度叠加不适用于钠盐的G″数据。酯和酸共聚物之间的流变响应的差异解释的差异inTg。三种衍生物G ′叠加所需的温度位移Δ T的差异反映了链间相互作用Δ H的差异。成簇离聚物的流动机制由引发和增长步骤组成。
A study has been made of the dynamic and steady shear melt theology of an ethylene‐methacrylic acid copolymer, its methyl ester, and 70% neutralized sodium salt. Measurements were made with a Rheometrics mechanical spectrometer using the eccentric rotating disks and cone‐and‐plate geometries over a temperature range of 120–180°C and frequency range of 10−3to 102rad/sec. Correspondence was found between steady shear viscosity and the complex dynamic viscosity for the ester and acid materials. Over the temperature and frequency range studied the time‐temperature superposition principle was applicable to G′ data for each of the derivatives and a supermaster curve could be constructed from the three individual master curves. Time‐temperature superposition was found not applicable to G″ data for the sodium salt. Differences in rheological response between the ester and acid copolymers are explained by differences inTg. It is suggested that differences in temperature shifts ΔTrequired to produceG′ superposition between the three derivatives reflect differences in ΔHfor interchain interactions. A mechanism for flow of clustered ionomers is consisting of an initiation and a propagation step.