The ¹H–¹³C cross-polarization magic angle spinning kinetics was studied in poly(2-hydroxyethyl methacrylate) (pHEMA), i.e. a soft material with high degrees of internal freedom and molecular disorder, having the purpose to track the influence of increasing local incoherent contributions to the effects of coherent nature in the open quantum spin systems. The experimental CP MAS kinetic curves were analyzed in the frame of the models of isotropic and anisotropic spin diffusion with thermal equilibration. The rates of spin diffusion and spin-lattice relaxation as well as the profiles of distribution of dipolar coupling, the parameters accounting the effective size of spin clusters and the local order parameters were determined. The intensities of the peaks of periodic quasi-equilibrium origin gradually decrease with increasing disorder, i.e. going from most ordered to more disordered sites in the polymer. Assuming that the thermal motion induced by the temperature gradients is much faster than the equilibration driven by spin diffusion due the difference in spin temperatures, it was deduced that the thermal equilibration in pHEMA occurs in the time scale of 10⁻⁴ s. This is one order of magnitude faster than the spectral spin diffusion, which occurs between spins having different resonance frequencies. The thermal equilibration in the case of remote spin clusters was described by the ‘stretched exponent’ decay. This led to the fractal dimension D_p ≈ 1.65 for both carbon sites (quaternary and carbonyl). The obtained D_p value corresponds to the aggregates, which images are very similar to those for pHEMA and some other related polymer structures are usually conceived.

的¹ H- ¹³在聚甲基丙烯酸2-羟乙酯（pHEMA）中研究了C交叉极化的魔角旋转动力学，pHEMA是一种具有高度内部自由度和分子无序度的软质材料，旨在追踪对材料的局部不相干贡献增加的影响。开放量子自旋系统中相干性质的影响。在具有热平衡的各向同性和各向异性自旋扩散模型的框架内分析了实验性CP MAS动力学曲线。确定了自旋扩散和自旋晶格弛豫的速率，以及偶极耦合分布的分布图，说明了自旋簇有效尺寸的参数和局部有序参数。周期性准平衡起源的峰值强度随着无序度的增加而逐渐降低，即 从聚合物中最有序的位置到更无序的位置。假设由于自旋温度的不同，温度梯度引起的热运动要比自旋扩散驱动的平衡快得多，因此可以推断出pHEMA中的热平衡发生在10分钟的时间范围内。⁻⁴  s。这比频谱自旋扩散快一个数量级，频谱自旋扩散发生在具有不同谐振频率的自旋之间。远程自旋团簇的热平衡通过“拉伸指数”衰减来描述。这导致了分形维数d _p  ≈1.65两个碳位点（季和羰基）。所获得的D _p值对应于聚集体，该图像与pHEMA的图像非常相似，通常可以构想出一些其他相关的聚合物结构。