National Centre for Macromolecular Hydrodynamics (NCMH), School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK.
School of Chemistry, University Park Campus, University of Nottingham, Nottingham NG7 2RD, UK.
Molecules. 2022 Mar 25;27(7):2133. doi: 10.3390/molecules27072133.
Butvar B-98 and PDMS-OH both have a demonstrable ability as consolidants for archaeological wood. This makes them both potential treatment options for the Oseberg collection, which is one of the most important archaeological finds from the Viking era. Both Butvar B-98 and PDMS-OH are soluble in organic solvents, offering a useful alternative to aqueous-based consolidants. Extensive characterisation studies were carried out on both of these polymers, with the use of analytical ultracentrifugation and viscometry, for the benefit of conservators wanting to know more about the physical properties of these materials. Short column sedimentation equilibrium analysis using SEDFIT-MSTAR revealed a weight-average molar mass (weight-average molecular weight) of (54.0 ± 1.5) kDa (kg · mol) for Butvar B-98, while four samples of PDMS-OH siloxanes (each with a different molar mass) had an of (52.5 ± 3.0) kDa, (38.8 ± 1.5) kDa, (6.2 ± 0.7) kDa and (1.6 ± 0.1) kDa. Sedimentation velocity confirmed that all polymers were heterogeneous, with a wide range of molar masses. All molecular species showed considerable conformational asymmetry from measurements of intrinsic viscosity, which would facilitate networking interactions as consolidants. It is anticipated that the accumulated data on these two consolidants will enable conservators to make a more informed decision when it comes to choosing which treatment to administer to archaeological artefacts.
Butvar B-98 和 PDMS-OH 均具有作为考古木材加固剂的能力。这使得它们都成为奥塞贝格藏品的潜在处理选择之一，奥塞贝格藏品是维京时代最重要的考古发现之一。Butvar B-98 和 PDMS-OH 均溶于有机溶剂，为基于水的加固剂提供了有用的替代品。对这两种聚合物进行了广泛的特性研究，使用分析超速离心和粘度计，以便希望更多地了解这些材料物理性质的保护者使用。使用 SEDFIT-MSTAR 进行短柱沉降平衡分析表明，Butvar B-98 的重均摩尔质量（重均分子量）为（54.0 ± 1.5）kDa（kg · mol），而四个不同摩尔质量的 PDMS-OH 硅氧烷样品的重均分子量分别为（52.5 ± 3.0）kDa、（38.8 ± 1.5）kDa、（6.2 ± 0.7）kDa 和（1.6 ± 0.1）kDa。沉降速度证实所有聚合物均为不均匀的，具有广泛的摩尔质量范围。所有分子物种均表现出相当大的构象不对称性，从特性粘度测量中可以看出，这将有助于作为加固剂的网络相互作用。预计这两种加固剂的累积数据将使保护者在选择要对考古文物进行哪种处理时能够做出更明智的决策。
