Track monomer consumption and polymer yield in minutes. Choose balance or gravimetric methods with checks. Save clean summaries and share them with your team.
| Sample | Time (min) | M0 (mol) | Mt (mol) | Conversion (%) | Rate (%/min) |
|---|---|---|---|---|---|
| S1 | 10 | 5.00 | 3.95 | 21.00 | 2.100 |
| S2 | 20 | 5.00 | 2.85 | 43.00 | 2.150 |
| S3 | 30 | 5.00 | 1.10 | 78.00 | 2.600 |
| S4 | 40 | 5.00 | 0.55 | 89.00 | 2.225 |
Conversion quantifies how much monomer becomes polymer during a run. In batch systems, conversion commonly rises from 0% to 80–95% before viscosity and heat transfer limits slow propagation. Tracking conversion against time supports consistent product targets, residual monomer specifications, and safer operating envelopes. Many plants sample every 5–20 minutes early in the reaction, then less frequently as rates taper.
This calculator supports monomer balance (M0 and Mt) and gravimetric estimation (P and Mt). Balance values often come from GC, HPLC, or NMR assays, while gravimetric values come from filtered, washed, and dried solids. Use duplicates or triplicates when possible; a 1–2% assay or weighing bias can shift conversion by several percentage points. If you enter reactor volume, the calculator also reports C0 and Ct, which are useful for comparing different fill levels.
The conversion rate reported here is an average: conversion divided by elapsed time in seconds, minutes, or hours. Use it for batch comparisons, heat removal checks, and early-stage kinetic screening, not as an instantaneous derivative. For temperature comparisons, keep the same time basis and sampling window, then evaluate trends using Arrhenius plots or simple normalized ratios. Always keep units consistent; mixing grams and moles can produce apparent conversions above 100%.
Key levers include initiator concentration, temperature profile, mixing intensity, and inhibitor control. Higher temperature may increase rate but can raise exotherm risk and broaden molecular weight distribution. Oxygen ingress, chain transfer agents, and rising viscosity can reduce effective radical concentration and create diffusion limits. Feeding strategies, staged initiator dosing, and effective cooling can extend high-rate regions and reduce gel effects during late conversion.
Quality checks highlight common anomalies such as Mt>M0, negative values, zero time, or implausibly high conversion. Store notes with each calculation to link results to batch IDs, sampling points, and drying conditions. Use the CSV for spreadsheets, trend charts, and statistical control, and use the PDF for controlled summaries in SOP and audit workflows. Keeping a consistent reporting template improves handoffs between R&D, production, and quality teams across every campaign.
Use monomer balance when you have reliable M0 and Mt from analytical testing. Use gravimetric when you can dry and weigh polymer accurately and still measure remaining monomer. Choose the method that best matches your SOP.
It is an average rate over the elapsed time you enter: Conversion (%) divided by time. It helps compare batches and operating conditions, but it is not an instantaneous kinetic slope from closely spaced samples.
Most cases come from inconsistent units, incorrect basis selection, or assay bias. For example, entering Mt in grams while M0 is in moles inflates depletion. Recheck unit choices, sampling dilution factors, and instrument calibration.
Volume does not change conversion. It enables concentration outputs (C0, Ct, consumed concentration) so you can compare runs at different fill volumes or scales. Enter volume only if your M0 and Mt match the chosen basis.
Incomplete drying, trapped solvent, or volatile additives will overstate polymer mass. Use defined drying temperature, time, and vacuum conditions, then cool in a desiccator before weighing. Record these conditions in the Notes field.
They provide a consistent snapshot of inputs, outputs, and flags. For formal QA, ensure your record system controls file naming, versioning, and access. Include batch ID, sample time, and operator details in Notes.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.