• 폴리머
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• 제33권2호
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• pp.164-168
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• 2009

본 연구는 화학적으로 개질된 열가소성 전분(chemically modified thermoplastic starch(CMPS))과 poly(lactic acid)(PLA)와 poly(butylene adipate-co-terephthalate)(PBAT) 블렌드의 형태학, 열적 및 기계적 특성에 미치는 영향에 대해서 연구하였다. PLA/PBAT 블렌드에 CMPS를 이 블렌드의 중량기준으로 10, 20, 30 wt%를 첨가하여 이축압출기로 가공하였다. PLA/PBAT/CMPS 블렌드에서 PLA의 유리전이온도($T_g$)는 CMPS 함량이 증가하여도 큰 변화를 나타내지 않았지만, CMPS의 첨가에 의해 PLA상과 PBAT상 사이의 계면상태가 좋아지는 상용성 있는 형태학을 보여주었다.

• Macromolecular Research
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• 제15권1호
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• pp.44-50
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• 2007

This study investigated the effect of ultrasound irradiation on the blend of poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT). The blends of PLA/PBAT(50/50) (PBAT50) were prepared in a melt mixer with an ultrasonic device attached. Thermal, rheological, and mechanical properties, morphology, and biodegradability of the sonicated blends were analysed. The viscosity of the sonicated blends was increased by the ultrasound irradiation owing to the strong interaction. The morphology of the sonicated blends was significantly dependent on the duration o the ultrasound irradiation. For PBAT50, the phase size reduction was maximized when the blends were ultrasonically irradiated for 30 sec. At longer duration of ultrasound irradiation, the PBAT phase underwent flocculation. Measurement of the tensile properties showed an increased breakage tensile stress and an enhanced Young's modulus when the blends were properly irradiated. This improvement was ascribed to better adhesion between the PLA matrix and the PBAT domain and to better dispersion of the PBAT phase. However, the tensile properties were maximized after excessive energy irradiation, which was ascribed to an emulsifying effect leading to coalescence of the PBAT phase. Impact strength was increased to reach a peak with the ultrasound irradiation, and was higher than the untreated sample for all sonicated samples due to the difference of failure mechanism between the tensile test and the impact test.

• 방사선산업학회지
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• 제7권2_3호
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• pp.141-147
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• 2013

The simple and facile radiation technique of the preparation of antibacterial biodegradable polymer films containing silver nanoparticles (Ag NPs) was described. The biodegradable poly(butylene adipate-co-terephthalate) (PBAT) films containing silver trifluoroacetate (Ag TFA) were prepared by a solvent casting method, and then the films were irradiated by electron beams at the various doses ranging from 20 to 200 kGy to form Ag NPs in the biodegradable polymers. The results of UV-vis and FE-SEM/EDX analyses revealed that the Ag NPs were successfully formed in the PBAT matrix during the electron beam irradiation, and their amounts were dependant on the absorbed dose and Ag TFA concentrations. Furthermore, on the basis of the results of the antibacterial test through disk diffusion and colony counting test, the irradiated PBAT/Ag TFA films exhibited the antibacterial property due to the formation of Ag NPs.

• 한국환경과학회지
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• 제26권1호
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• pp.79-85
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• 2017

Multi-Walled Carbon Nanotubes (MWCNTs) were modified with epoxy and aminosilane diethanolamine (DEA), and nanocomposites of poly(butylene adipate-co-terephthalate) (PBAT) and the modified MWCNTs were prepared with the aim of improving the physical properties of biodegradable PBAT. The physical and the thermal properties of the PBAT/MWCNT nanocomposites were investigated using various techniques. Fourier transform infrared spectroscopy measurements revealed that the MWCNTs were efficiently modified with DEA. Scanning electron micrographs of the nanocomposites indicated that the modified MWCNTs were dispersed homogeneously in PBAT. The thermal stability of the nanocomposite decreased with increase in the content of epoxy-MWCNT-DEA due to the poor thermal stabilities of epoxy and amino silane DEA. However, the surface hydrophobicity of the nanocomposite increased. The highest stress (170% of PBAT) was observed when the content of epoxy-MWCNT-DEA in the nanocomposite was 2 wt%.

• 한국포장학회지
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• 제29권1호
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• pp.9-14
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• 2023

The application of starch-based films is limited by the poor water vapor barrier and mechanical properties. In this study, plasticized octenyl-succinated corn starch (OTPS) was mixed into Poly (butylene adipate-co-terephthalate) (PBAT) with various concentration (0/0.25/0.5/0.75 wt%) of epoxidized soybean oil (ESO) to enhance the mechanical properties and the hydrophobicity of blends. Tensile Strength and elongation at break of PBAT/OTPS film was slightly strengthened as the added ratio of ESO raised to 0.5 wt%, yet lessened again in 0.75 wt% sample. The yield strength and elastic modulus were highest in 0.25wt% of ESO added. In thermal properties, the melting temperature (T_m) and crystallization temperature (T_c) were highest at ESO 0.25 and the maximum degradation temperature (T_max) of components of the films were developed as ESO added. Also, it has been proved that the addition of hydrophobic substances reduces the hydrophilicity of the film by contact angle. This suggests the use of epoxidized oil for preparing films based on high TPS content allows obtaining enhanced interfacial adhesion. This study confirmed that ESO acts as a compatibilizer between OTPS and PBAT to improve the mechanical properties and hydrophobicity of the sample. The sample containing 0.5wt% of ESO was the most suitable for packaging application.

• 한국포장학회지
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• 제27권2호
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• pp.85-90
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• 2021

The gamma irradiation was on to Poly(butylene sebacate-co-terephthalate) (PBSeT), Poly(butylene adipate-co-terephthalate) (PBAT), Poly(lactic acid) (PLA) and casting polypropylene (CPP) at dose levels from 0 to 50 kGy. The properties of gamma irradiated samples were analyzed using DSC, TGA, UTM and FT-IR spectra. The mechanical and thermal properties of PBSeT and PBAT after gamma irradiation were less affected than CPP. The tensile strength and elongation of PBSeT was not affected by gamma irradiation, while these of PBAT, PLA and CPP were significantly decreased at 50 kGy gamma-ray dose. The thermal stability of PBSeT, PBAT, PLA and CPP showed a similar tendency to tensile strength. The glass transition temperature(T_g) and melting temperature(T_m) of PBSeT and PBAT were not altered by increasing gamma-ray dose, while these of PLA and CPP decreased. The chemical composition of all samples was not modified by gamma irradiation, and it was confirmed by FT-IR spectra. Based on mechanical and thermal stability studies of gamma irradiation on bioplastics, tested biodegradable packaging materials showed a potential to be used in sterilization process up to 35 kGy.

• 공업화학
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• 제24권1호
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• pp.104-111
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• 2013

본 연구에서는 생분해성 지방족 폴리에스터 중 비교적 고가인 poly(butylene adipate-co-terephthalate) (PBAT)와 상대적으로 저가의 생분해성 고분자인 polylactic acid (PLA)의 블렌드에 3종류의 개질제를 사용하여 그 효과를 조사하였다. 개질제로는 에폭시계의 커플링제와 diisocyanate계열의 methylenediphenyl 4,4'-diisocyanate (MDI)와 hexamethylene diisocyanate (HDI)를 사용하였다. 여러 가지 조성의 블렌드에 용융흐름지수, 동적 점탄성을 조사하였다. 또한, 인장시험을 통한 기계적 물성 조사와 FE-SEM으로 시편의 파단표면을 관찰하였다. 이를 통해 PLA/PBAT 블렌드의 상용성과 개질제의 효과 및 기계적물성에 미치는 영향을 고찰하였다. 개질제로 HDI를 사용했을 때 PLA/PBAT의 인장물성이 크게 증가하였다.

• 문화기술의 융합
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• 제8권5호
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• pp.553-559
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• 2022

필름의 멀칭 기술은 토양 표면을 덮어 토양 온도와 수분을 조절하고, 잡초를 억제하는 기능에 사용된다. 본 연구에서는 생분해성 멀칭필름의 내가수분해성 및 기계적 물성을 향상시키기 위하여 PBAT(Poly Butylene Adipate-co-Terephthalate)와 PLA(Poly Lactic Acid)를 이축 압출기를 사용하여 개질한 후, 필름의 물성과 생분해 특성을 조사하였다. 멀칭필름을 토양에 매립 후 기간별 필름의 중량감소를 확인하였고, 건답에서 벼농사용 멀칭 후 식물의 성장을 관찰하였다. 내가수분해성이 향상된 멀칭 필름은 작물의 성장에 우수한 특성을 나타냈으며, 생분해되는 멀칭 필름은 환경 친화적이고 효율적이며, 지속가능한 농업관행을 위한 새로운 대안으로써의 가능성을 제공 할 수 있다.

• 공업화학
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• 제31권4호
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• pp.416-422
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• 2020

본 연구에서는 생분해성 고분자인 poly(latic acid) (PLA), poly(butylene adipate-co-terephthalate) (PBAT)와 첨가제로 hydrogenated castor oil (HCO) powder를 이용하여 친환경 생분해성 소재를 제조하였다. 제조한 PLA/PBAT/HCO 블렌드 필름의 특성은 scanning electron microscope (SEM)와 fourier-transform infrared spectroscopy (FT-IR)를 이용하여 분석하였다. SEM 분석 결과 HCO가 첨가된 PLA/PBAT (8 : 2) 블렌드 필름은 12-hydroxy stearic acid (12HSA)와 cellulose가 첨가된 필름과 비교했을 때, 안정적인 표면을 나타내었다. FT-IR 결과는 PLA/PBAT 블렌드 필름에서 HCO의 특성 피크의 나타냈으며, HCO 함량이 0에서 0.2 wt%까지 증가함에 따라 intensity가 증가함을 알 수 있었다. 또한, 제조한 PLA/PBAT/HCO 블렌드 필름의 물리적 특성, 열 분석을 수행하였다. 그 결과 HCO 첨가에 의해 물리적 특성과 열 안정성이 3배 이상 향상되었음을 확인하였다. 제조한 생분해성 소재의 토양에서 생분해 정도는 90 days 동안 6~20% 분해됨을 확인하였다.

• 문화기술의 융합
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• 제8권2호
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• pp.349-354
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• 2022

본 연구는 PBAT(Poly Butylene Adipate-co-Terephthalate)와 PLA(Poly Lactic Acid)를 사용하여 수지의 컴파운드와 생분해성 멀칭필름의 내가수분해성과 기계적 물성을 향상시키기 위하여 수행되었다. 어닐링 온도조건에 따른 다양한 비율의 사슬연장제와 기계적 물성을 검토하였다. 어닐링공정은 컴파운드 수지의 결정화 능력을 향상시킬수 있음을 나타내었다. 사슬연장제의 첨가로 인장강도를 향상시킬 수 있었으며, 필름의 내가수분해성도 증가하였다. 사슬연장제 0.6phr. 첨가의 경우에 인장강도는 383.0Kgf/cm²으로 대조 필름과 비교하여 155% 향상되었다. 팽창비(BUR)가 2.5일 때, 필름의 최적 인장강도는 기계 방향(MD)과 가로 방향(TD) 에서 379.0/195.2kgf/cm²까지 크게 증가하였다.