| Summary: | 碩士 === 國立中興大學 === 化學系 === 86 === The use of poly(oxyethylene)-diamine or monoamine as
the hydrophilic monomers to react with various other
monomers or prepolymers with the purpose of producing
antistatic materials is the main theme of this thesis.
(1) Poly(oxyethylene)-segmented polyamides The synthesis
of poly(oxyethylene) containing polyamides has been
carried out by the co-polycondensation of diacid including
terephthalic, adipic, and sebacic acid, and diamines
including polyetheramines of Jeffamine D-230, ED-2003,
D-2000 and EDR-148. The polyamides consist of structures of
poly(oxyethylene) and poly- oxypropylene) segments as well
as amide linkages. With judicious choice of the hydrophilic
amine, the amphiphilic polyamides could have a surface
resistivity as low as 107.2 ohm/sq. (2) Metal ion
added poly(oxyethylene)-segmented polyamides A series of
lithium ion added poly(oxyethylene)-segmented polyamides
have been prepared by using a developed solvent/metal halide
addition method. The structures involve the poly(
oxyethylene)/lithium complexes which promote the surface
conductivity reaching 10 4.2 ohm/sq. (3) Poly(
oxyethylene) grafting polypropylene maleic anhydride
Using polyether monoamines such as poly(oxyethylene)monoamine,
i.e., commercially available Jeffamine M-2070 of
molecular weight of approximately 2000, a family of
hydrophilic group grafting on polypropylenes have been
prepared. This type of polymers can have surface resistivity
of 107.5 ohm/sq. (4) Poly(oxyethylene) grafting styrene/
maleic anhydride polymers Using the similar methods
described in (3), another family of Jeffamine M-2070
grafted polystyrenes are made. The surface resistivity of
such polymer can reach at a value of 107.8 ohm/sq. The
prepared polymers have been compared among structures with
regard to their physical property, particularly the DSC
analyses including Tg, Tm and the heat of melting. Based
on these data and observations, a mechanism involving
hydrogen bonding between moisture water and poly(
oxyethyl-ene)/amide functionalities is suggested, as depicted
below: The important features of this mechanism are cited
below: (a) The surface conductivity is a function of
the weight content of hydrophilic groups in the presence.
(b) The hydrophilic groups have a optimal molecular weight
of ca. 2000. The smaller molecular weight of amines appear to
be worse. (c) The poly(oxyethylene) is a better
hydrophilic group than the poly(oxypropylene). (d)
The surface conductivity is derived from the moisture water
association with polymers through a group of hydrogen
bondings and partially ionization of water. (e) It
seems that the comb-like structure is better than the linear
one in terms of transferring electrostatics (perhaps the
degree of crystallinity is also a factor involved in the
mechanism).
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