It is a challenge to research and develop silicon surfactants with good acid and alkali stability. In the present paper, methylpropenyl polyether modified nonionic silicone surfactant (MPNTS), an alkali-resistant and hydrolysis-resistant silicone surfactant, was synthesized by hydrosilylation of 1,1,1,3,5,5,5-heptamethyl trisiloxane (MDHM) and methylpropenyl polyether (EO(7)). The polyether segments are grafted onto the main chain of organosilicon heptamethyl trisiloxane at a molar ratio of 1:1.05 (n(Si-H):n(C=C)). To evidence product formation, the MPNTS were analyzed by FT-IR and1H NMR spectroscopy. The surface tension of NPNTS is 18.68 mN/m, and the CMC value is 78 mg/L by a contact angle tester. MPTNS shows hydrolytic stability and maintains that it could keep surface activity after standing for 60 days at pH = 7–10. The compatibility performance analysis shows that MPNTS has good compatibility and synergy with cationic, anionic, and nonionic surfactants, and it reveals the application prospects in daily chemicals, agricultural adjuvants, and other products.Keywords:silicone surfactant;trisiloxane;stability;synergy
This study develops flexible PAN-Eu/PVP/TPPO(PAN-EPT) fluorescent nanofiber membranes through a dual-ligand electrospinning strategy (PVP/TPPO), addressing long-standing challenges in rare-earth polymer systems: self-aggregation of rare-earth complexes (leading to luminescence quenching) and poor compatibility between complexes and polymer matrices. The optimized membranes exhibit UV-activated red emission at 618 nm with 45% higher color purity than conventional Eu 3+ complexes, enabled by suppressed aggregation (XPS-confirmed Eu-O coordination) and enhanced energy transfer. Simultaneous mechanical robustness (12 MPa strength, 32% elongation) stems from PAN-EPT hydrogen bonding (FTIR-verified). Demonstrating meter-scale production capability (>90% yield) and humidity-resistant fluorescence, these membranes enable three advanced applications:Tamper-evident security tags with ISO-certified chromatic stability, Wearable UV sensors (3-s response time), Flexible optical waveguides. This strategy establishes a universal framework for manufacturing mechanically durable luminescent materials.
Yong Zhou,Yinyan Gong,Yongli Huang,Zengsheng Ma,Xi Zhang,Chang Q. Sun
Solvation of acid, base, and salt is ubiquitously important to all subject areas in chemistry , health care and life science. However, fine resolution of the solvation dynamics, solute-solvent molecular interactions , and solute capability of transforming the hydrogen bond (O:H O, or HB) and surface stress remain great challenge. Incorporating the notion of O:H O bond cooperativity with a strategy of differential phonon spectroscopy (DPS) has enabled resolution on the fraction and stiffness of the solvent HB from the mode of water to the hydration shells upon NaOH, NaI and HI solvation. Results show that Na + and I + ionic polarization shortens the H O bond and stiffens its phonon from 3200 to 3500 cm − 1 in the hydration shells. The H + in the HI solution forms a H ↔ H anti-HB that disrupts the solution network and surface stress. The excessive electron lone pairs of OH – form the O : ⇔ : O super-HB that compresses the network, sharing the same effect of mechanical compression shifting the H O phonon from above 3100 cm − 1 to its below; the solute H O bond performs the same to the H O dangling bond at surface featured at 3610 cm − 1 . The fraction coefficients or phonon abundance transition, f H = 0, f HO ∝ C, and f x ∝ 1-exp(− C/C 0 ) (x = Na + and I − and C the solute concentration) towards saturation, feature the solute capability of HB transformation. Practice not only confirms the essentiality of the H ↔ H anti-HB point fragilization, the O : ⇔ : O super-HB point compression, and the ionic polarization to the performance of the respective HI, NaOH, and NaI solutions, but also demonstrate the power of the DPS that enables fine-resolution of solvation dynamics and solute capabilities.
危险品化学品经营许可证（带存储）