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Rheological investigation on different reactivity of polymer/clay nanocomposite to electric field : 고분자/점토 나노복합체의 전기장에 대한 반응성 차이에 대한 유변학적 연구

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Authors

옥현근

Advisor
안경현
Major
공과대학 화학생물공학부
Issue Date
2013-08
Publisher
서울대학교 대학원
Keywords
Rheologypolymer nanocompositeelectric fieldorganoclaypolypropylenepoly (lactic acid)
Description
학위논문 (석사)-- 서울대학교 대학원 : 화학생물공학부, 2013. 8. 안경현.
Abstract
In this study, the A.C. electric field effect was investigated according to combination of polymer/clay nancomposite. Nonpolar polypropylene and polar poly(lactic acid) were used as two base polymers. Three organically modified clays(Closite 10A, 20A, 30B) were chosen based on the structural difference of modifiers. Polymer/clay nanocomposite was produced by melt compounding. The A.C. electric field was applied during dynamic time sweep test on the modified fixture of RMS using a function generator and high voltage amplifier. The electric field effect was first confirmed by storage modulus change in dynamic time sweep test. The storage modulus of each polymer/clay nanocomposite was increased with time and both the increment and the magnitude of final value were dependent upon the activated electric field strength. The frequency sweep test was conducted before and after electric field was activated. The storage modulus at low frequency was highly increased with applied electric field strength and terminal slope approached to near zero. The reactivity to electric field was very different in terms of each combination of polymer/clay nanocomposite. To quantify the extent of electrical reactivity, normalized storage modulus was regressed using universal exponential rising equation. The fitted result showed that the electrical reactivity was decided at the initial state of the reaction, so the initial tangential slope of normalized modulus was suggested to represent the reactivity to the electric field. In case of polypropylene/clay, the reactivity was in the order of C20A, C10A and C30B, while poly (lactic acid)/clay showed the opposite order, followed by C30B, C10A and C20A. The electrical reactivity was dependent structural similarity between polymer and clay, so Hansen solubility parameter was introduced to express this structural affinity. Polymer/clay combination, which shows similar Hansen solubility parameter, was highly reactive to electric field.
Language
English
URI
https://hdl.handle.net/10371/127062
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