저비용 PBAT 복합체 제조를 위한 폐석고와 탄산칼슘 충전제 비교 연구

공태웅; 김인태; 문준호; Tridib Kumar Sinha; 김동호; 김인선; 나광용; 최겸우; 오정석; Tae Woong Kong; In Tae Kim; Junho Moon; Tridib Kumar Sinha; Dong Ho Kim; Inseon Kim; Kwangyong Na; Kyum Woo Choi; Jeong Seok Oh

Polymer(Korea), Vol.45, No.1, 119-128, January, 2021

DOI10.7317/pk.2021.45.1.119 Export Citation

저비용 PBAT 복합체 제조를 위한 폐석고와 탄산칼슘 충전제 비교 연구

Comparing Waste Gypsum with CaCO3 as Filler Towards Developing Low-cost PBAT C omposites

공태웅^{1, 2}, 김인태¹, 문준호¹, Tridib Kumar Sinha¹, 김동호², 김인선³, 나광용³, 최겸우⁴, 오정석^{1, †}

¹경상대학교 나노신소재융합공학과
²전남테크노파크 우주항공 첨단소재센터
³남해화학
⁴제이에스테크

Tae Woong Kong^{1, 2}, In Tae Kim¹, Junho Moon¹, Tridib Kumar Sinha¹, Dong Ho Kim², Inseon Kim³, Kwangyong Na³, Kyum Woo Choi⁴, and Jeong Seok Oh^{1, †}

¹Department of Materials Engineering and Convergence Technology, ERI, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, Korea
²Space-Aeronautics & Advanced Non-Metal Material Center, Jeonnam Technopark, 1448-345 Goheungman-ro, Goheung 59532, Korea
³Namhae chemical corp., 1384 Yeosusandan-ro, Yeosu-si 59618, Korea
⁴JS TECH Co., Ltd., Sacheon Industrial Complex, 158 Oegukgieop-ro, Sanam-Myun, Sacheon 52530, Korea

E-mail:

초록

폐석고(CaSO4) 및 탄산칼슘(CaCO3)을 이용하여 poly(butylene adipate-co-terephthalate)(PBAT) 복합체를 용융 혼합으로 제조한 뒤 비교하였다. 석고와 탄산칼슘은 Ca2+ 양이온을 동일하게 포함하지만 다른 크기의 음이온 즉, 각각 SO4 2-, CO3 2-을 함유하고 있다. Fajans’ rule에 따르면 CaCO3는 이온성이 더 큰 반면, CaSO4는 편극성이 더 크다. 석고는 탄산칼슘에 비해 편극성이 크기 때문에 filler-matrix간 정전기적 상호작용에 의해 PBAT 내에 분산이 더 잘 되었다. 석고/PBAT 복합체는 충전제-고분자 함량 20:80의 비율에서 탄산칼슘/PBAT 복합체 대비 낮은 인장강도와 높은 연신율 값을 나타냈다. Polylactic acid(PLA)를 첨가함에 따라 석고/PLA/PBAT 복합체는 인장강도와 연신율이 향상했지만 탄산칼슘/PLA/PBAT 복합체의 경우에는 PLA의 첨가에 따른 효과가 관찰되지 않았다. 이는 탄산칼슘에 의한 PLA의 depolymerization에 기인하는 것으로 사료된다. 이러한 복합체의 기계적 거동은 열적, 형태학적, 결정학적 분석을 통해 잘 설명되었다.

Melt-mixed composites of poly(butylene adipate-co-terephthalate) (PBAT) with the waste gypsum and calcium carbonate were prepared and their properties were compared. Calcium carbonate and gypsum contain the same cation (Ca2+) but different anions i.e., smaller CO3 2- and larger SO4 2- respectively. According to the Fajans’ rule, CaCO3 is more ionic whereas gypsum is more polarizable. Because of the abundant polarizability, gypsum was well dispersed in the PBAT matrix through the filler-matrix electrostatic interaction. The gypsum/PBAT showed lower tensile strength but higher elongation at break at a filler to matrix ratio of 20: 80 than those of CaCO3/PBAT. Further, the addition of polylactic acid (PLA) enhanced both the tensile strength and elongation at break of the gypsum/PLA/PBAT while no such effective changes were observed for CaCO3/PLA/PBAT maybe due to the possibility of depolymerization of polymers in the presence CaCO3. Thermal, morphological, and crystallography studies well corroborate with the mechanical behavior of the composites.

Keywords:poly(butylene adipate-co-terephthalate);polylactic acid;gypsum;recycling;melt-mixing

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[7] Bajpai PK, Singh I, Madaan J, Compos. Mater., 27, 52 (2014)

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[10] Garlotta DA, J. Polym. Environ., 9, 63 (2001)

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[12] Burgos N, Martino VP, Jimenez A, Polym. Degrad. Stabil., 98, 651 (2013)

[13] Osman MJ, Ibrahim NA, Yunus WMZW, Orient. J. Chem., 33, 3015 (2017)

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[15] Sirisinha K, Somboon W, J. Appl. Polym. Sci., 124(6), 4986 (2012)

[16] Kim TJ, Kim TH, Kim SG, Seo KH, Polym. Korea, 40(3), 371 (2016)

[17] Xie J, Wang Z, Zhao Q, Yang Y, Xu J, Waterhouse GI,N, Zhang K, Li S, Jin P, Jin G, ACS Omega, 3, 1187 (2018)

[18] Jiang L, Wolcott MP, Zhang JW, Biomacromolecules, 7(1), 199 (2006)

[19] Franca DC, Almeida TG, Abels G, Canedo EL, Carvalho LH, Wellen RMR, Haag K, Koschek K, J. Nat. Fibers, 16, 993 (2019)

[20] Van Breemen N, Mulder J, Driscoll CT, Plant Soil., 75, 283 (1983)

[21] Kara O, Bolat I, Turk. J. Agric. For., 31, 181 (2007)

[22] Denev YG, Denev GD, Popov AN, J. Elastomers Plast., 41, 119 (2009)

[23] Gopikrishnan CR, Jose D, Datta A, AIP Adv., 2, 012131 (2012)

[24] Fajans K, Springer: Berlin, Germany, vol 3, pp 88 1967.

[25] Shainberg I, Sumner ME, Miller WP, Farina MPW, Pavan MA, Fey MV, Springer: NewYork, USA, pp1 1989.

[26] Neal JA, Mozhdehi D, Guan ZB, J. Am. Chem. Soc., 137(14), 4846 (2015)

[27] Signori F, Coltelli MB, Bronco S, Polym. Degrad. Stabil., 94, 74 (2009)

[28] Dhole SG, Dake SA, Prajapati TA, Helambe SN, Procedia Manuf., 20, 127 (2018)

[29] Cho J, Jeon I, Kim SY, Lim S, Jho JY, ACS Appl. Mater. Interfaces, 9, 27984 (2017)