Crystallization and melting behavior of poly (n-alkyl acrylate-co-octadecyl acrylate)s
Yang Fu1,2; Wang Xiaohong2; Zhou Jianjun2; Li Lin2; Zhang Baohong1
AbstractA series of poly(n-alkyl acrylate)s (PAAn) and poly(octadecyl acrylate-co-n-alkyl acrylate)s (P(AA18-co-AAn)) (n , the side chain carbon number) were synthesized with AWN as initiator at 60 degrees C for 24 h in nitrogen atmosphere. The molecular weight of the polymers and the polymer dispersity index were measured with gel permeation chromatography (GPC). The thermal behaviors of PAAn and P(AA18-co-AAn) were studied by differential scanning calorimetry (DSC) The results manifest that, for homopolymers, there is a gradual increase of fusion heats and melting points with the side-chain carbon number ranging from 10 to 20, because more units of methylene enter into the crystal lattice for PAAn with longer side chains length. At the same time, the melting endothermal peak of PAAn was not detected in DSC running as the n was less than 10, which meant that 10 was the critical side chain carbon number for the discrimination of crystallizable and non-crystallizable PAAn. For copolymers of AA 18 with crystalline homologous AA n (n = 10, 12, 14, 16) series, the crystallinity (X-c) of copolymers was between the values of the corresponding homopolymers, and it increased with increasing the content of AA18, and the corresponding melting ranges had a maximum value at certain AA18 content. The value of extent of equilibrium crystallinity (X-c/X-cmax) of P(AA18-co-AA14) and P(AA18-co-AA16) changes little with increasing content of AA18, because the side chain carbon number of monomers has little difference and the affection of the other side chain is small. While the X-c/X-cmax of P(AA18-co-AA10) and P(AA18-co-AA12) increases at first and then decreases. The more difference of side chain carbon numbers (18/12,18/10) led to the interactional disturbing effect,and many defects would occur during crystallization. At the same time,the shorter side chain length of AA10 and AA12 decreased the crystallizing ability obviously resulting in much less X-c. For the copolymers of AA18 with non-crystalline homologous AAn (n = 4,6,8) series,both X-c and X-cmax increased with increasing content of AA18, since AA18 was the only crystallizable component. With increasing the side chain carbon number of non-crystalline homologous AAn series (n = 4,6,8) of the same AA18 mole fraction, the values of X-c/X-max decreased, while the maximum values of melting range almost kept constant.
KeywordPolyacrylate Side-chain Crystallization Crystallinity Melting Range
Indexed BySCI
WOS IDWOS:000256276600012
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYang Fu
Affiliation1.Harbin Engn Univ, Coll Chem Engn, Harbin 150001, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China
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GB/T 7714
Yang Fu,Wang Xiaohong,Zhou Jianjun,et al. Crystallization and melting behavior of poly (n-alkyl acrylate-co-octadecyl acrylate)s[J]. ACTA POLYMERICA SINICA,2008(5):466-471.
APA Yang Fu,Wang Xiaohong,Zhou Jianjun,Li Lin,&Zhang Baohong.(2008).Crystallization and melting behavior of poly (n-alkyl acrylate-co-octadecyl acrylate)s.ACTA POLYMERICA SINICA(5),466-471.
MLA Yang Fu,et al."Crystallization and melting behavior of poly (n-alkyl acrylate-co-octadecyl acrylate)s".ACTA POLYMERICA SINICA .5(2008):466-471.
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