Molecular packing and properties of poly(benzoxazole-benzimidazole-imide) copolymers

Zhuang, Yongbing; Li, Xiangyang; Gu, Yi

doi:10.1039/c2py20074k

Cited by 112 publications

(99 citation statements)

References 40 publications

(52 reference statements)

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“…To illustrate the influence of the components on the aggregation structure of the prepared shape memory binary mixture polyimides, out‐of‐plane WAXD measurements were carried out to determine the arrangement of molecular chains, as shown in Figure . The WAXD pattern of the neat PIO showed reflections at 2θ = 14.9, 16.8, and 18.9°, corresponding to a small crystallization, in good agreement with literature data . In contrast, for PIB, there were two pronounced peaks at 2θ = 14.5° ( d spacing = 6.1 Å) and 2θ = 23.8° ( d spacing = 3.72 Å), respectively.…”

Section: Resultssupporting

confidence: 89%

Tunable Triple‐Shape Memory Binary Mixtures with High Transition Temperature and Robust Mechanical Properties

Yang

Wang

2016

Macro Chemistry & Physics

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High temperature triggered shape memory polymers are currently attracting considerable attention due to their potential applications in the context of harsh environments. Herein, tunable dual-and triple-shape memory binary mixture polyimides with high transition temperatures that may meet some of these requirements are presented. The binary mixtures are prepared by blending two poly (amic acid)s of rodlike poly(benzoxazole-imide) (PIB) and fl exible polyetherimide (PIO), followed by solvent evaporation and thermal imidization. The aggregation structures, thermal mechanical properties, and shape memory behaviors are systematically studied. It is found that dual-shape memory cycles give excellent shape fi xity and recovery of up to 98 and 97%. Moreover, binary mixtures with broad glass transition temperatures endow good triple-shape memory effects and the shape memory at each step crucially depends on the content of the PIB due to the enhancement of physical crosslinks. Additionally, their thermally tough and mechanically strong properties would suggest wide potential applications of the mixtures.

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Section: Resultssupporting

confidence: 89%

Tunable Triple‐Shape Memory Binary Mixtures with High Transition Temperature and Robust Mechanical Properties

Yang

Wang

2016

Macro Chemistry & Physics

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“…This implies that the aggregation structure of the PI-TB-1 membrane was mainly amorphous morphology, but was combined with some ordered chain packing domains. 57,58 Then, the calculated d-spacing values of 6.74, 5.72, and 3.46 Å from the peaks located at 2θ = 13.12°, 15.49°, and 25.75°for the PI-TB-1 polymer membrane can be assigned to the main interchain distance in the amorphous domain, the interchain distance in the ordered domain and π−π stacking of aromatic rings, respectively. Obviously, the chain packing of macromolecules in the ordered domains is closer than that in amorphous domains.…”

Section: ■ Experimental Sectionmentioning

confidence: 97%

Intrinsically Microporous Soluble Polyimides Incorporating Tröger’s Base for Membrane Gas Separation

et al. 2014

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“…25,26 Curve-tting deconvolution of the WAXD proles was performed using Origin 8.5 so-ware to separate crystallization and amorphous contributions. The crystallinity (X c ) was calculated with the following equation:…”

Section: Characterizationmentioning

confidence: 99%

Effect of pre-imidization on the structures and properties of polyimide fibers

Chang

Zhang

et al. 2015

RSC Adv.

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A series of polyimide (PI) fibers derived from 3,3 0 ,4,4 0 -biphenyltetracarboxylic dianhydride (BPDA), 4,4 0 -oxydiphthalic anhydride (ODPA) and p-phenylenediamine (p-PDA) were successfully prepared through a partially pre-imidization process, and the effects of different amount of dehydration reagents and initial poly(amic acid) (PAA) concentrations on the structure-property relationship of the resultant PI fibers were systematically investigated. The results showed that both the increased amount of dehydration reagents and PAA concentration could result in the ordered molecular packing arrangement of the polymer chains and gradually formed homogeneous structures in the fibers, which are proposed to be essentially dominated for the effectively enhancement in the mechanical properties of PI fibers. Moreover, the PI fibers obtained through the pre-imidization process still exhibited excellent thermaloxidative stabilities, although the 5% weight loss temperature of the PI fibers was slightly decreased compared with that of the pure PI fibers as a result of the residual dehydration reagents in the fibers.Consequently, the present work provided a new approach in preparing high-performance PI fibers through a partially pre-imidization process.

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Molecular packing and properties of poly(benzoxazole-benzimidazole-imide) copolymers

Cited by 112 publications

References 40 publications

Tunable Triple‐Shape Memory Binary Mixtures with High Transition Temperature and Robust Mechanical Properties

Tunable Triple‐Shape Memory Binary Mixtures with High Transition Temperature and Robust Mechanical Properties

Intrinsically Microporous Soluble Polyimides Incorporating Tröger’s Base for Membrane Gas Separation

Effect of pre-imidization on the structures and properties of polyimide fibers

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