Structure-properties relationships of novel cyclic olefinic copolymer/poly(L-lactic acid) polymer blends

Journal of Materials Research and Technology

Zakir Hussain¹  Ahmad Nawaz Khan¹  Shah Rukh Abbas²  Zakia Riaz² 

[1] Technology (NUST), Sector H-12, 44000 Islamabad, Pakistan;;School of Chemical and Materials Engineering (SCME), National University of Sciences &

关键词: Polymer blends;    Immiscible blends;    Cyclic olefinic copolymer;    Poly(L-lactic acid) Mechanical properties;   

DOI  :  

来源: DOAJ

【 摘 要 】

The structure-properties relationships of novel cyclic olefinic copolymer (COC)/poly(L-lactic acid) (PLLA) polymer blends are investigated by varying the PLLA content from 5–20 wt % in COC matrix, forming an immiscible blends at all concentrations. Despite immiscibility, COC favors the formation of α- crystal form of PLLA in the blends, contrary to the α’- crystal form in neat PLLA due to non-covalent interactions of the chain moieties as evident from x-ray diffraction, Fourier transform infrared spectrometer and differential scanning calorimetry. The COC/PLLA blends revealed tunable superior mechanical and barrier properties as compared to the neat counterparts. The tensile modulus, strength and toughness of COC/PLLA blends at 15 wt% are significantly enhanced ∼ 89 %, 103 % and one order of magnitude, respectively. Such reinforcement and super toughening mechanisms are pertaining to the effective dissipation of loads across the interfaces, enabling them to delay the crack growth by avoiding stress concentration sites. Likewise, the water vapor permeation (WVP) of the blends is reduced ∼ 4 times than neat COC.

【 授权许可】

Unknown