ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 2, pp. 315−323. © Pleiades Publishing, Ltd., 2016.
Synthesis of Ultra High Molecular Weight
Poly(dimethyldiallyl ammonium chloride)
Yue Jun Zhang
and Xu Jia
The Department of Pharmaceuticals and Fine Chemicals Engineering, The School of Chemical Engineering,
Nanjing University of Science and Technology,
Nanjing, 210094, Jiangsu Province, P.R. China
Received February 29, 2016
Abstract—In the study we reported the synthesis of poly-(dimethyldiallyl ammonium chloride) (PDMDAAC) with
ultra high molecular weight. The polymerization method consists in the following: the ultra-high purity monomer
synthesized in lab was used as the raw material, and APS as the initiator. APS was added in a lump and the po-
lymerization temperature was increased stepwise to complete the polymerization gradually in 9 h reaction time.
The maximum intrinsic viscosity ([η]) of PDMDAAC reached 3.66 dL g
at a monomer conversion rate (Conv)
of 96.71%. The structure and properties of PDMDAAC were characterized using FTIR, NMR, GPC-MALLS,
and DTA-TG. The effects of polymerization conditions, such as the polymerization temperature, m(DMDAAC),
m(APS) : m(DMDAAC), and m(Na
EDTA) : m(DMDAAC), on the [η] and Conv of products were investigated.
Meanwhile, the effects of the monomer purity on the [η] of products were compared. The results showed that the
types and amount of impurities in monomer solution are two key factors, which affect the polymerization and,
thus, the molecular weight of products.
The text was submitted by the authors in English.
Water soluble polymer, especially the cationic water
soluble polymer, ﬁ nds important uses in many ﬁ elds,
such as paper making, cosmetics, water treatment, phar-
maceuticals, biology, nano- technique and so on .
Poly(dimethyldiallyl ammonium chloride) (PDMDAAC)
is one of the most widely applied [1, 2]. Although this
polymer was ﬁ rstly synthesized in 1950s , the research-
es on its new synthesis method [3, 4], application [5, 6],
reaction mechanism [7–9], and relationships between
structure and properties [10–13] are always focused on.
However, it should be emphasized that the properties
and various performances of a polymer are all relied on
its structures and molecular weights directly. A high mo-
lecular weight with narrow molecular weight distribution
of the product obtained means that more series products
with novel properties can be developed  based on the
progress of new polymerization method. Therefore, the
most interesting thing for the researchers is how to obtain
product PDMDAAC with high molecular weight through
a simple, economical, and effective method.
The common methods used for obtaining PDMDAAC
with high molecular weight are the improvements of
polymerization methods and processing conditions.
The previous work has made an obvious progress on it.
Up to date, the highest intrinsic viscosity [η] reported
for PDMDAAC prepared within 9 h was 3.43 dL g
by using ammonium persulphate (APS) as an initiator
and one-step industrial monomer as raw material .
However, there are no yet reports on obtaining ultra
high molecular weight PDMDAAC using high purity
monomer as monomer and the effects of polymerization
variables on the [η] and Conv of the product as well as
on the comparison of effect of the monomer purity on the
[η] of product PDMDAAC.
In the paper, ultra high molecular weight of
PDMDAAC will be tried to obtain by using high purity
monomer made from a two-step method in lab as raw
material especially, and APS as initiator based on the