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Chem. , 69: 2893. E. (1992). Polymer, 33: 3647. E. (1990). In Integration of Fundamental Polymer Science and Technology, volume IV, RJ. A. , London: Elsevier Applied Science, p. 33. 50 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 Chapter 2: Section 1 Theory of Gelation Tobita, H. (1992). Macromolecules, 25: 1671. , and Nomura, M. (1996). Kobuhshi Kako, 45: 543. Tobita, H. (1993). Macromolecules, 26: 836. , and Zhu, S. Polymer (in press). Tobita, H. (1993). Macromolecules, 26: 5427. Tobita, H.

It has been found that the influence of such a gelation temperature also appears on the spacing, which is determined by small angle x-ray diffraction. The spacing increases as the gelation temperature increases. This variation of spacing is also observed for crystals obtained from dilute solutions below c*. Its dependence on crystallization shows similar behavior at gelation above c*. Furthermore, the effect of thermal history on gelation was studied and interesting results have been obtained. Using the gels obtained by quenching, the size of the crystallite of polyethylene with various molecular weights is approximately constant.

I A junction-zone model that consists of eight polymer chains and segments [7]. where the changes in enthalpy and entropy of an individual chemical repeat unit are AHo and ASo , respectively. Their approach is based on the statistical method [10] and they proposed an equation to correlate the concentration, temperature, and molecular weight at the gel point: l n c * - - ( AH~ kBT --1 lnM+const (4) s-1 In reality, there is a possibility of having distribution on junction multiplicity and variation in the junction zone size.

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