Synthesis of 3-isopropenyl-α,α-dimethylbenzyl isocyanate-styrene-EVAL Copolymer(I) and Evaluating Compatibility of I / poly[ethylene-co-(vinyl acetate)] / polystyrene

莊銘輝(Ming-Hui Zhuang)

指導教授 ： 吳和生

元智大學/工程學院/化學工程與材料科學學系/碩士(1997年)

摘要

The properties of various blending compound, poly[ethylene-
co-(vinyl acetate)] (EVA)/polystyrene were investigated. Four
kinds of the polymeric reaction were studied in this study as
follow：(i).the hydrolysis reaction of poly[ethylene-co-(vinyl
acetate)]. (ii).the copolymerization reaction of 3-isopropenyl-
α,α-dimethylbenzyl isocyanate (TMI) with styrene (STY). (iii).
the condensation reaction of the products of part(I) and part(ii)
, to from polyurethane compound, (iv). the blend of EVA/
polyurethane/polystyrene. The kinetic and characterization of
each reaction is discussed in the follows.
First, the objective of part (i) is to obtain various
alkalize degree of EVA by replacing acetate group to OH group,
the reaction time, temperature and agitation rate were conducted
. The properties of EVA hydrolysis compound were analyzed by
infrared Spectrophotometer (IR), element analyzer (EA) and
thermogravimetry analyzer (TGA), the alkalize degree was
increased with an increasing reaction time in the work.
Second, the free radical copolymerization of styrene with
3-isopropenyl-α,α-dimethylbenzyl isocyanate using α,α'-azo-
bisisobutyronitrile (AIBN) as initiator was studied.The reaction
time, temperature and the initiator count were carried out to
obtain different products. According to experimental result, the
optimum operating condition was AIBN=2wt%, temperature=75℃ and
reaction time=36h. Obtaining high conversion prefers to high
mole ratio of STY to TMI. The Q(resonance) and e(polarity) of
Aldfrey-Price parameters of TMI-STY copolymer were 0.57 and -0.14
respective. The thermal property of the copolymer increased when
mole ratio of STY to TMI increased. The sequence for STY/TMI is
9/1>7/1>5/1>3/1>1/1>1/3>1/5>1/7>1/9. These copolymers were of
thermal cracking temperature of 5%=195~325℃ and that of 50%=300
~410℃.
Third, The condensation reaction of the part(i) and the part
(ii) product was studied. The properties of varied product were
analyzed.
Finally, the characterization of blending EVA/polyurethane/
polystyrene was investigated, the compatibility and mechanical
properties of varied product were analyzed.

關鍵字

聚苯乙烯 ； 聚乙烯醋酸乙酯 ； 摻合 ； 聚胺基甲酸酯 ； 相容性 ； 化學工程 ； 化學

並列摘要

無資料

並列關鍵字

polystyrene ； poly[ethylene-co-(vinyl acetate) ； blend ； polyurethane ； compatibility ； CHEMICAL-ENGINEERING ； CHEMISTRY