[논문]Change of Crystalline Properties of Poly(ethylene-co-vinyl acetate) according to the Microstructures

Choi, Sung-Seen; Chung, Yu Yeon

doi:10.7473/ec.2021.56.2.92

[국내논문] Change of Crystalline Properties of Poly(ethylene-co-vinyl acetate) according to the Microstructures 원문보기

Elastomers and composites = 엘라스토머 및 콤포지트, v.56 no.2, 2021년, pp.92 - 99

Choi, Sung-Seen (Department of Chemistry, Sejong University) , Chung, Yu Yeon (Department of Chemistry, Sejong University)

Abstract ▼ AI-Helper

Microstructure-dependent changes in the crystalline properties of poly(ethylene-co-vinyl acetate) (EVA) was investigated using various EVAs at different VA contents via X-ray diffraction (XRD). The parameters analyzed herein were percentage crystallinity (Xc), interplanar crystal spacing (dhkl), crystal stack size (Dhkl), and the number of crystal plane piles (Nhkl). The Xcs of [110] and [200] crystals were 21.0-4.1 and 6.7-1.4%, respectively, and they decreased by approximately 2.3 and 0.7% for every mol% of the VA content, respectively. The Xc ratios of the [110] and [200] crystals were approximately 3. The d110s and d200s values were 0.41-0.42 and 0.37-0.38 nm, respectively. The D110s and D200s values were 9.56 -21.92 and 7.00-16.42 nm, respectively. The dhkls increased with an increase in the VA content, whereas the Dhkls decreased. The N110s and N200s were 22.7-51.3 and 18.3-43.2, respectively, and they decreased by increasing the VA content. EVA with the same VA content showed different crystalline properties as per the suppliers, and some EVAs deviated from the average trends. This could be explained by the difference in their microstructures such as the sizes and distribution uniformity of the ethylene sequences in EVA chains.

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표/그림 (12)

그림 Scheme 1. Crystalline structure formed by the ethylene block of EVA.
그림 Scheme 2. Microstructures of EVA depending on the positions of vinyl acetate units.
표 Table 1. EVAs Used in This Study
그림 Figure 1. XRD pattern and deconvolted peaks of EVA 18. The XRD pattern was deconvoluted into the amorphous and crystalline peaks. FWHM denotes the full width at half maximum of the peak.
그림 Figure 2. Variation of the total, [110], and [200] crystallinities of EVA with the vinyl acetate content. The squares, circles, and triangles stand for the EVAs of Aldrich Co., DuPont Co., and Hanwha Co., respectively. The solid, open, and crossed symbols indicate the total, [110], and [200] crystallinities, respectively. The three dash lines are the curve fitted lines less than 10 mol% of the vinyl acetate content for the total, [110], and [200] of y = -2.98x + 37.68 (r = 0.975), y = -2.27x + 28.61 (r = 0.977) and y = -0.72x + 9.06 (r = 0.945), respectively.
표 Table 2. Bragg Angles (2θ) and FWHMs of EVAs Obtained from the XRD Analysis Results (º)
그림 Figure 3. Variations of the crystallinity ratio of [110]/[200] of EVA with the vinyl acetate content.
그림 Figure 4. Variations of the interplanar crystal spacings (d_hkls) with the vinyl acetate content. The squares, circles, and triangles stand for the EVAs of Aldrich Co., DuPont Co., and Hanwha Co., respectively. The solid and open symbols indicate the d₁₁₀ and d₂₀₀, respectively. The dash lines are the curve fitted lines for the d₁₁₀ and d₂₀₀ of y = 7.010 × 10^-4x + 0.409 (r = 0.637) and y = 4.954 × 10^-4x + 0.373 (r = 0.485), respectively.
그림 Figure 5. Variations of the interfacial distances (D_hkls) with the vinyl acetate content. The squares, circles, and triangles stand for the EVAs of Aldrich Co., DuPont Co., and Hanwha Co., respectively. The solid and open symbols indicate the D₁₁₀ and D₂₀₀, respectively. The dash lines are the curve fitted lines for the D₁₁₀ and D₂₀₀ of y = -0.751x + 23.092 (r = 0.901) and y = -0.522x + 17.625 (r = 0.782), respectively.
그림 Figure 6. Variations of the numbers of crystal plane piles (N₁₁₀ and N₂₀₀) of the [110] and [200] crystalline peaks of EVA with the vinyl acetate content. The squares, circles, and triangles stand for the EVAs of Aldrich Co., DuPont Co., and Hanwha Co., respectively. The solid and open symbols indicate the crystalline structures of [110] and [200], respectively. The dash lines are the curve fitted lines for [110] and [200] crystals of y = -1.86x + 56.15 (r = 0.900) and y = -1.42x + 47.07 (r = 0.787), respectively.
그림 Figure 7. Variation of the N₁₁₀/N₂₀₀ ratio with the vinyl acetate content. N₁₁₀ and N₂₀₀ are the numbers of crystal plane piles of [110] and [200], respectively. The squares, circles, and triangles stand for the EVAs of Aldrich Co., DuPont Co., and Hanwha Co., respectively.
표 Table 3. Influence of the Microstructures on the Crystalline Properties of EVA*

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