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Shape memory and self-repairing effect of PLA/TPU/graphene nanocomposite

Title
Shape memory and self-repairing effect of PLA/TPU/graphene nanocomposite
Author
유재광
Advisor(s)
장영욱
Issue Date
2017-02
Publisher
한양대학교
Degree
Master
Abstract
Biodegradable polymer blends of poly (lactic acid) (PLA) and thermoplastic urethane (TPU) were prepared by a melt mixing in an internal mixer. The morphology, thermal, mechanical properties and shape memory and self-repairing effect of the blends were investigated. The blends comprised an immiscible and TPU are dispersed in PLA matrix uniformly. The addition of TPU elastomer accelerated the cold crystallization rate of the PLA. With increasing TPU content in the blend, the blend shows an improved elongation at break and Izod impact strength, implying the toughening effects of the TPU elastomer in the PLA. The blends exhibited a unique shape memory effect, i.e. plastic deformation accompanied yielding, and deform shaped sample can be recovered according to the reversible plasticity shape memory effect (RP-SME). Furthermore, the disappearance of surface dented was observed using optical microscopy. Small amount of octadecylamine modified graphene oxide (ODA-GO) was incorporated into a PLA/TPU (90/10) blend by a melt blending process. As the amount of the ODA-GO increases, the dispersed domain size (D) of TPU phase decreases than without the ODA-GO. Differential scanning calorimetry and dynamic mechanical analysis showed that the degree of crystallinity and moduli increased with increasing ODA-GO content in the nanocomposites. Addition of ODA-GO nanoparticle into the PLA/TPU blends caused an increase in modulus and tensile strength which is accompanied with decreased in the elongation at break. The Izod impact strength gradually increased with increasing ODA-GO content in the nanocomposites. With increasing ODA-GO content, shape memory effect is evaluated by shape recovery ability and shape recovery speed. Further, the nanocomposites showed light triggered shape memory and self-repairing effects under NIR light.
URI
http://dcollection.hanyang.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000099218https://repository.hanyang.ac.kr/handle/20.500.11754/124559
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > FUSION CHEMICAL ENGINEERING(융합화학공학과) > Theses (Master)
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