For this reason, we decided to monitor the aging of 10 wt% Grace formulation by PGSE NMR. In Table we show Dt and size data at 0 to 140 days at room temperature with 𝑀 ̅ 𝐷 values based on the correlation just developed. Entry Time (days) [AlMe] (mM) Dt rH(Å) VH (Å 3 ) 𝑀 ̅ 𝐷 (g mol -1 ) In these experiments, undiluted MAO was employed and so even in unaged material the dimensions and MW of the MAO are much larger due to reversible aggregation. 23 Based on the data in Table (entries 1-4) the increase in 𝑀 ̅ 𝐷 scales in a linear fashion with [AlMe] (R 2 = 0.997).