聚乙烯单层纳米粒子的退火
Annealing of single lamella nanoparticles of polyethylene
摘要：
研究了聚乙烯自由悬浮单层纳米粒子在水溶液中热退火过程中尺寸和结构的变化。使用小角X射线散射和低温透射电子显微镜，它表明，通过在125 ℃下退火纳米颗粒，获得了一个加倍的结晶片层夹在两个无定形聚合物层之间。这种结晶片层的增厚可以理解为单个纳米颗粒内聚合物链的解环。此外，退火温度从90 ℃到115 ℃的变化表明，结晶片层厚度的倒数随退火温度线性增加，导致Gibbs-Thomson图中的再结晶线。由于纳米颗粒仅由大约八个聚合物链组成，因此它们可以被认为是实验实现平衡聚合物晶体的理想候选者。
英文摘要：
We study the change of the size and structure of freely suspended single lamella nanoparticles of polyethylene during thermal annealing in aqueous solutions. Using small-angle x-ray scattering and cryogenic transmission electron microscopy, it is shown that a doubling of the crystalline lamella sandwiched between two amorphous polymer layers is obtained by annealing the nanoparticles at 125 C. This thickening of the crystalline lamella can be understood in terms of an unlooping of polymer chains within a single nanoparticle. In addition a variation of the annealing temperature from 90 C to 115 C demonstrates that the inverse of the crystalline lamellar thickness increases linearly with the annealing temperatures leading to a recrystallization line in a Gibbs-Thomson graph. Since the nanoparticles consist of about only eight polymer chains, they can be considered as a ideal candidates for the experimental realization of equilibrium polymer crystals.
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