十六烷基三甲基溴化铵共混或包覆聚偏二氟乙烯的不同结晶行为,Macromolecules

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十六烷基三甲基溴化铵共混或包覆聚偏二氟乙烯的不同结晶行为
Macromolecules ( IF 5.1 ) Pub Date : 2023-10-11 , DOI: 10.1021/acs.macromol.3c01466
Yongjia Nie ₁ , Wenpeng Zhao _{1,

2} , Xu Chen ₁ , Hao Zhang ₂ , Jian Hu ₂ , Shaojuan Wang ₂ , Shouke Yan _{2,

3}

Affiliation

研究了与十六烷基三甲基溴化铵（CTAB）共混或涂覆的聚偏二氟乙烯（PVDF）在等温和非等温过程中的结晶，揭示了PVDF和CTAB之间的相互作用方式对PVDF多晶型行为的影响。混合样品中含量有限的 CTAB 的随机分散导致 PVDF 链的三种不同状态，即完整链以及由离子偶极相互作用引起的 TGTG' 和 TTT 链序列。完整链和TGTG'序列促进PVDF在α相结晶，而TTT链序列导致PVDF在高温下在γ相结晶，这使得后期α完全转变为γ ' 。阶段。另一方面，对于涂覆CTAB的PVDF，离子偶极相互作用导致PVDF和CTAB之间的界面处出现长TTT序列，甚至全反式链段，这保证了PVDF直接在γ中结晶。在高温下为β相，但在熔体淬火时为β相。这提供了一种简单有效的方法来制造高结晶度（例如，47％）电活性PVDF薄膜，其优先β相约为。95.3%和少量γ相（4.7%左右）。

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Different Crystallization Behaviors of Poly(vinylidene fluoride) Blended with or Coated with Cetyltrimethylammonium Bromide

Crystallization of poly(vinylidene fluoride) (PVDF) either blended with or coated with cetyltrimethylammonium bromide (CTAB) during isothermal and nonisothermal processes has been studied, which reveals the influence of the interaction way between PVDF and CTAB on the polymorphic behavior of PVDF. The random dispersion of CTAB with limited content in the blend sample leads to three different states of PVDF chains, i.e., intact chains and TGTG′ and TTT chain sequences induced by the ion–dipole interaction. While the intact chains and TGTG′ sequences promote the crystallization of PVDF in the α-phase, the TTT chain sequences cause the crystallization of PVDF in the γ-phase at high temperatures, which endows a full transformation of α into γ′ at the later stage. On the other hand, for the PVDF coated with CTAB, the ion–dipole interaction results in the long TTT sequences, or even all-trans chain segments, at the interface between PVDF and CTAB, which ensure the crystallization of PVDF directly in the γ-phase at high temperatures but in the β-phase during melt-quenching. This provides a simple and effective method for fabricating high-crystallinity (e.g., 47%) electroactive PVDF thin films with a preferential β-phase of ca. 95.3% and a small amount of γ-phase (around 4.7%).

更新日期：2023-10-11

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