Standards Sorted by Type

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Molecular Weight Standards, GPC/SEC Calibration Kits and Validation Standards

PSS supplies certified standards that meet the requirements of DIN 55672 and ISO/EN 13885. All reference materials are characterized with GPC/SEC to obtain molecular weight values. These values are subsequently confirmed by alternative methods such as Laser Light Scattering, Viscometry, MALDI-ToF, VPO and NMR.

Each product comes with a Certificate of Analysis, which provides the characterization information, the testing parameters, the molecular weight values (M_n, M_w, M_p, PDI) and the chromatogram. Calibration kits include a calibration report.

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Poly(methacrylic acid) sodium salt

Order No.	Nominal MW	Description	PDI	Packsize
PSS-pmakit		Kit Poly(methacrylic acid) sodium salt, 10 x 0.5 g, Mp 1 310 - 1 120 000 Da
PSS-PMA1.2K	1200	Poly(methacrylic acid) sodium salt	<1,25	500,00
PSS-PMA1.6K	1600	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA3.5K	3500	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA7.6K	7600	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA18K	18000	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA36K	36000	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA76K	76000	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA160K	160000	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA340K	340000	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA500K	500000	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA870K	870000	Poly(methacrylic acid) sodium salt	<1,20	500,00
PSS-PMA1M	1000000	Poly(methacrylic acid) sodium salt	<1,25	500,00

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Poly(ethylene terephthalate)

Order No.	Nominal MW	Description	PDI	Packsize
PSS-PET10K	10000	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET120K	120000	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET18K	18000	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET25K	25000	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET3.5K	3500	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET35K	35000	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET40K	40000	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET50K	50000	Poly(ethylene terephthalate)	<2,10	250,00
PSS-PET75K	75000	Poly(ethylene terephthalate)	<2,10	250,00

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Functionalized polymers

Order No.	Nominal MW	Description	PDI	Packsize
PSS-BDFO10K	10100	Poly(butadiene-1.4) OH-end group	1,03	1000,00
PSS-PSBR40K	41000	Poly(styrene) brominated	1,04	1000,00
PSS-PSBR100K	95600	Poly(styrene) brominated	1,07	1000,00
PSS-PSBR190K	186000	Poly(styrene) brominated	1,04	1000,00
PSS-PSLF3.5K	3500	Poly(styrene) fluorescein labeled	1,06	1000,00
PSS-PSLF7.9K	7920	Poly(styrene) fluorescein labeled	1,04	1000,00
PSS-PSLF45K	45000	Poly(styrene) fluorescein labeled	1,04	1000,00
PSS-PSLF100K	100000	Poly(styrene) fluorescein labeled	1,08	1000,00
PSS-PSLF560K	560000	Poly(styrene) fluorescein labeled	1,14	1000,00
PSS-PSLF1M	1000000	Poly(styrene) fluorescein labeled	1,28	1000,00
PSS-PSLS5K	5180	Poly(styrene) sulfonated-Li labeled	1,04	1000,00
PSS-PSLS12K	11600	Poly(styrene) sulfonated-Li labeled	1,04	1000,00
PSS-PSLS18K	18300	Poly(styrene) sulfonated-Li labeled	1,13	1000,00
PSS-PSLD2K	1790	Poly(styrene) with deuterium end group	1,07	1000,00
PSS-PSLD3K	3100	Poly(styrene) with deuterium end group	1,05	1000,00
PSS-PSLD8K	8620	Poly(styrene) with deuterium end group	1,04	1000,00
PSS-PSLD16K	16000	Poly(styrene) with deuterium end group	1,04	1000,00
PSS-PSLD23K	22500	Poly(styrene) with deuterium end group	1,02	1000,00
PSS-PSLD70K	70000	Poly(styrene) with deuterium end group	1,02	1000,00
PSS-PSLT56.2K	56200	Poly(styrene) with thiol end group	1,05	1000,00
PSS-PSOI2K	1840	Poly(styrene) without initiator end group	1,24	1000,00
PSS-PSOI60K	59600	Poly(styrene) without initiator end group	1,04	1000,00

Polydispersity Index, PDI

The Polydispersity Index, PDI, is a measure of the width of the molar mass distribution. It is defined as ratio of the weight average molar mass M_w and the number average molar mass M_n, PDI =M_w/M_n.

PDI is 1 for monodisperse substances (no molar mass distribution), it is larger than 1 for the vast majority of all macromolecules. The PDI depends on the polymerization technique applied to produce the material. In praxis the PDI can be very large up to values of 100 and above. Narrow PDIs can only be obtained using controlled/living polymerization techniques.

Please refer to the literature section to learn more.

Narrow Standards
Broad Standards

Narrow polymer standards are made by controlled/living polymerization techniques (living anionic/cationic, ATRP, RAFT, etc.) or by fractionation of very broad standards.

All narrow standards have small polydispersity indices and exhibit a sharp and slim chromatographic profile.

The M_p value (molar mass at the peak maximum) is well defined and independent on the column resolution. As M_p is the only clearly defined point in the chromatogram this value is used to establish GPC/SEC calibration curves.

Standards with a narrow molar mass distribution are used:

to construct a GPC/SEC calibration curve using the provided M_p values
for the validation of a chromatographic system
for the determining of physical constants

Broad reference materials are made by radical polymerization, polycondensation or coordinative polymerization (polyolefins).

The PDI of broad standards is usually > 1.5. For broad standards the M_p value is a function of the column resolution. Molar mass values provided for broad standards are thus only the average molar masses M_w and M_n.

Modern GPC/SEC software packages allow for the construction of a calibration curve by the use of M_w, M_n or the intrinsic viscosity [η] of broad standards.

Standards with a broad molar mass distribution are used:

to validate a chromatographic system
to determine physical constants such as the Mark-Houwink constants K and ∝
to construct a calibration curve using broad calibration options
to test for porosity mismatch