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北京化工大学 化工资源有效利用国家重点实验室 生物医用材料北京实验室 北京 100029
E-mail: wuyx@mail.buct.edu.cn
纸质出版日期:2020-1,
网络出版日期:2019-11-12,
收稿日期:2019-8-10,
修回日期:2019-9-9,
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张方, 张航天, 杨甜, 孔波, 郭安儒, 章琦, 吴一弦. 官能化聚四氢呋喃-
Fang Zhang, Hang-tian Zhang, Tian Yang, Bo Kong, An-ru Guo, Qi Zhang, Yi-xian Wu. Synthesis and Property of Novel Functionalized Polytetrahydrofuran-
张方, 张航天, 杨甜, 孔波, 郭安儒, 章琦, 吴一弦. 官能化聚四氢呋喃-
Fang Zhang, Hang-tian Zhang, Tian Yang, Bo Kong, An-ru Guo, Qi Zhang, Yi-xian Wu. Synthesis and Property of Novel Functionalized Polytetrahydrofuran-
采用2-氯-2
4
4-三甲基戊烷或对二枯基氯为引发剂和TiCl
4
或FeCl
3
为共引发剂,引发异丁烯(IB)可控/活性正离子聚合与官能端基转化,设计合成不同分子量及窄分子量分布的端基官能化聚异丁烯,如双端烯丙基溴官能化聚异丁烯(Br-PIB-Br)或双端烯丙基胺官能化聚异丁烯(H
2
N-PIB-NH
2
). 采用烯丙基溴/高氯酸银体系引发四氢呋喃(THF)开环聚合,合成聚四氢呋喃活性链(PTHF
+
). 进一步通过将IB可控/活性正离子聚合与THF可控/活性正离子开环聚合2种方法相结合,设计合成2种新型官能化聚四氢呋喃-
b
-聚异丁烯-
b
-聚四氢呋喃(PTHF-
b
-PIB-
b
-PTHF)三嵌段共聚物:(1)以上述Br-PIB-Br为大分子引发剂,在AgClO
4
作用下引发THF活性正离子开环聚合,采用水终止活性链端,设计合成双端为羟基的HO-PTHF-
b
-PIB-
b
-PTHF-OH三嵌段共聚物(简称:FIBF-OH);(2)以上述合成的PTHF
+
活性链与H
2
N-PIB-NH
2
链端胺基发生高效亲核取代反应,设计合成中间链段连接点含―NH―官能基团的PTHF-
b
-HN-PIB-NH-
b
-PTHF三嵌段共聚物(简称:FIBF-NH). 在上述三嵌段共聚物中,极性PTHF链段与非极性PIB链段的热力学不相容,导致其呈现明显的微相分离,且微观形态与共聚组成相关. PTHF均聚物易结晶,在上述共聚物中由于PTHF链段单端受限致其结晶性减弱. 三嵌段共聚物分子链的中间连接点含―NH―官能基团,具有更强的氢键作用,促进PTHF链段重排并结晶,易形成更紧密的超分子网络结构,导致即使在PTHF链段相对分子量为0.7 kg·mol
−1
时仍具有较强的结晶性,且结晶熔融温度明显提高. 此外,由于FIBF-NH中形成超分子网络结构,使材料具有优异的自修复性能,材料表面的切痕在常温下10 min 后可以完全自愈合. 本文设计合成的新型官能化PTHF-
b
-PIB-
b
-PTHF三嵌段共聚物兼具有PTHF与PIB的优良性能,在生物医用、智能修复等功能材料领域具有潜在的应用前景.
The functionalized polyisobutylenes (PIBs) carrying allyl-Br or allyl-NH
2
with different molecular weights and narrow molecular weight distribution
could be successfully synthesized
via
controlled/living cationic polymerization of isobutylene (IB) in
n
-hexane/CH
2
Cl
2
mixed solvents at −80 °C. Controlled/Living cationic ring-opening polymerization (ROP) of tetrahydrofuran (THF) was achieved with Allyl-Br/AgClO
4
initiating system at 0 °C. Two kinds of novel functionalized PTHF-
b
-PIB-
b
-PTHF triblock copolymers were designed and synthesized
via
combination with controlled/living cationic polymerization of IB and controlled/living cationic ROP of THF. Terminal hydroxyl functionalized HO-PTHF-
b
-PIB-
b
-PTHF-OH triblock copolymers (expressed as FIBF-OH) were successfully synthesized by using the PIBs with difunctional allyl-Br terminal groups (Br-PIB-Br) as macroinitiators to initiate living cationic ROP of THF in the presence of AgClO
4
to create living PTHF
+
-
b
-PIB-
b
-PTHF
+
chains and then terminating by H
2
O molecules. On the other hand
PTHF-
b
-HN-PIB-NH-
b
-PTHF triblock copolymers containing hydrogen bonds at the connection point of PTHF and PIB segments (expressed as FIBF-NH) were also successfully synthesized
via
efficient nucleophilic substitution reaction between living PTHF
+
chains and amine groups in H
2
N-PIB-NH
2
. Due to the dynamic incompatibility between polar PTHF segments and nonpolar PIB segments and the crystallization of PTHF segments
PTHF-
b
-PIB-
b
-PTHF triblock copolymers exhibit an obvious microphase separation micromorphology. It is recognized that the chemical structure in the PTHF-
b
-PIB-
b
-PTHF triblock copolymers makes a great contribution to the formation of hydrogen bonding and thus the supramolecular network. The crystallization of PTHF segments could be improved even in FIBF-NH with relatively short PTHF segments
e.g.
M
n
PTHF
= 0.7 kg·mol
−1
. FIBF-NH could be completely self-healing at 25 °C for 10 min after cutting on its surface. However
the cutting on FIBF-OH surface was difficult to heal even at 30 °C for 3 days. Moreover
the PTHF-
b
-PIB-
b
-PTHF triblock copolymers could be used as drug carrier by interactions between PTHF segment and drug. The drug carrier microspheres exhibit pH-sensitive drug-release rate in PBS with different pH values. The novel functionalized PTHF-
b
-PIB-
b
-PTHF triblock copolymers combined the respective good properties from PIB and PTHF segments would have their potential applications as biomedical and smart-healing functional materials.
聚异丁烯聚四氢呋喃嵌段共聚物正离子聚合超分子网络
PolyisobutylenePolytetrahydrofuranBlock copolymerLiving cationic polymerizationSupramolecular network
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