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A new molecular mechanism is proposed to explain the shape memory effect of mesogen-jacketed liquid crystalline polymer fiber—poly-{2,5-bis[(4-butoxyphenyl)oxycarbonyl]styrene} (PBPCS) fiber-designed in the molecular level. Due to the strong “coupling effect” between flexible backbone and rigid side mesogens, the molecular structure of PBPCS can be regarded as “dual chains” model that is constituted...