CAJ | 학술논문

纳米复合水凝胶复杂的微观结构和动力学决定了其宏观性能，阐明其结构和动力学的非均匀性对揭示凝胶相变机理、认识其宏观物理和化学性质和设计新型高分子凝胶都具有重要意义。通过合成不同粘土含量的系列聚异丙基丙烯酰胺(PNIPAm)/锂藻土纳米复合水凝胶，运用多种先进的低场固体NMR技术详细研究了凝胶微观结构和动力学的非均匀性。首先建立了分析多组分凝胶体系中刚性和柔性高分子组分相对含量的计算方法，然后在不同粘土含量下，通过测量凝胶FID信号和质子T1定量研究了凝胶中刚性和柔性高分子组分的相对含量；通过偶极滤波双量子NMR实验，研究了体系中与交联密度关联的残余偶极作用参数随黏土含量的变化。结果表明：在纳米复合水凝胶中，随着粘土含量的增加，凝胶中聚合物的刚性相增加，而柔性相下降，当粘土含量达到12%(Wclay/Wwater)时体系中的刚性相含量趋于平衡。多量子实验结果表明，随着粘土含量的增加，纳米复合水凝胶中高分子链的残余偶极作用参数逐渐增大，反映了体系中高分子链的受限运动和二维无机纳米片层形成的物理交联密度增大的趋势。
납미복합수응효복잡적미관결구화동역학결정료기굉관성능，천명기결구화동역학적비균균성대게시응효상변궤리、인식기굉관물리화화학성질화설계신형고분자응효도구유중요의의。통과합성불동점토함량적계렬취이병기병희선알(PNIPAm)/리조토납미복합수응효，운용다충선진적저장고체NMR기술상세연구료응효미관결구화동역학적비균균성。수선건립료분석다조분응효체계중강성화유성고분자조분상대함량적계산방법，연후재불동점토함량하，통과측량응효FID신호화질자T1정량연구료응효중강성화유성고분자조분적상대함량；통과우겁려파쌍양자NMR실험，연구료체계중여교련밀도관련적잔여우겁작용삼수수점토함량적변화。결과표명：재납미복합수응효중，수착점토함량적증가，응효중취합물적강성상증가，이유성상하강，당점토함량체도12%(Wclay/Wwater)시체계중적강성상함량추우평형。다양자실험결과표명，수착점토함량적증가，납미복합수응효중고분자련적잔여우겁작용삼수축점증대，반영료체계중고분자련적수한운동화이유무궤납미편층형성적물리교련밀도증대적추세。
The macroscopic properties of soft matters are largely determined by their composition and the molecular mobility of each component. In this work, we used low field solid-state NMR to study the composition and dynamics of nanocomposite hydrogels with different clay contents. It was found that the content of rigid phase increased, while and the content of soft phase decreased with increasing clay content. A turning point of 12%Wclay/Wwater was found, above which the content of rigid phase tended to be a constant. The dipolar coupling constants were measured with double-quantum (DQ) experiments, and the results showed that the confinement of polymer chains and the crosslink density increased with the clay content.