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Enhancement of Mechanical Properties of FDM-PLA Parts via Thermal Annealing
被引:170
|作者:
Wach, Radoslaw A.
[1
]
Wolszczak, Piotr
[2
]
Adamus-Wlodarczyk, Agnieszka
[1
]
机构:
[1] Lodz Univ Technol, Inst Appl Radiat Chem, Fac Chem, Wroblewskiego 15, PL-93590 Lodz, Poland
[2] Lublin Univ Technol, Dept Automat, Nadbystrzycka 38D, PL-20618 Lublin, Poland
关键词:
crystallinity degree;
FDM;
poly(lactic acid);
radiation sterilization;
thermal annealing;
PROCESS PARAMETERS;
MOLECULAR-WEIGHT;
POLYLACTIC ACID;
CRYSTALLIZATION;
CRYSTALLINITY;
DEGRADATION;
MORPHOLOGY;
LACTIDE;
IMPACT;
MELT;
D O I:
10.1002/mame.201800169
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
The objective of this study is to investigate the possibility of enhancing mechanical properties of poly(lactic acid) (PLA) samples processed by a rapid manufacturing (RM) technique by increasing PLA crystallinity degree via thermal annealing. The samples are manufactured by fused deposition modeling (FDM) at different temperatures and subsequently evaluated by three-point bending flexural and tensile tests. The polymer processed at 215 degrees C is thermally annealed over its glass transition temperature in order to increase the degree of crystallinity to the maximum attainable level as measured by the differential scanning calorimetry and confirmed by X-ray diffraction. The increase in the degree of crystallinity of FDM-PLA enhances flexural stress of the samples by 11-17%. The study also demonstrates applicability of radiation sterilization for FDM-PLA parts. Therefore, thermal annealing might be introduced into a standard RM technology of PLA, particularly for sterilizable customized implants, to efficiently improve their mechanical properties.
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页数:9
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