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Unsaturated copolyesters poly(butylene succinate-co-cis-butene succinate) (P(BS-co-cBS)) were the first time prepared by polycondensation in combination with stannous octoate as catalyst and 4-methoxyphenol as radical inhibitor, achieving linear random copolyesters with a number-average molecular weight up to 38.2 kg/mol. The cis-2-butene-1, 4-diol used in this work showed a peculiarity of no isomerization...
In this article we report an in-situ catalytic strategy for homogeneous dispersion of β-nucleating agent N,N′-dicyclohexyl-terephthalamide (DCTPA) into isotactic polypropylene (iPP) as well as morphology control of the DCTPA/iPP composites. This strategy is based on catalyst to polymer morphology replication approach, in which by embedding Ziegler-Natta catalyst species on DCTPA surface, the fresh...
Three amine-functionalized 1,1-diphenylethylene (DPE) derivatives (DPE-(NMe2)2, DPE-NMe2 and DPE-SiH/NMe2) were used to study the end-capping reactions of poly(styryl)lithium (PS-Li) for investigating the effect on end-capping of electron-donating groups in DPE structures. In situ 1H NMR was used to measure the kinetic parameters of end-capping reactions. When the DPE derivative was held constant...
Realization of structural manipulation in stereocomplex (sc) polylactic acid holds the key to fully leverage its surpassing performance, such as heat resistance and mechanical properties. In this study, we investigated the evolution of crystalline morphology/structure of equimolar racemic blends under the quantitative shear field modulated by the pulling speed of glass fiber (GF). Shear-induced crystallization...
N-doped graphene oxide (NRG), one of the graphene oxide derivatives, has been widely incorporated with TiO2 nanoparticles because they increase interfacial contact between graphene and TiO2 nanoparticles. However, introduction of NRG/TiO2 (NRGT) nanocomposites into the membrane matrix to improve the hydrophilicity, permeability, and antifouling properties of ultrafiltration membranes has not been...
Three series of even-odd aliphatic copolyesters, poly(hexamethylene gluarate-co-hexamethylene pimelate) (PHGP), poly(hexamethylene pimelate-co-hexamethylene azelate) (PHPA), and poly(hexamethylene gluarate-co-hexamethylene azelate) (PHGA), were firstly synthesized derived from even diol of 1,6-hexanediol with odd diacids of glutaric acid, pimelic acid or azelaic acid, respectively. Then, their cocrystallization...
This article demonstrates a catalytic as well as efficient method to comprise a β-nucleating agent N,N’-dicyclohexyl-terephthalamide (DCTPA) into isotactic polypropylene (iPP) for the synthesis of β-crystalline-specified iPP (β-iPP). A novel DCTPA-based Ziegler-Natta catalyst was designed via a first modification step of DCTPA with TiCl4 and a subsequent supporting step of MgCl2-TiCl4-donor components...
Sequence distribution in the Living anionic copolymerization of Styrene and strong electron-donating DPE derivative, i.e. the 1,1-bis(4-N,N-dimethylanimophenyl)ethylene (DPE-(NMe2)2), was investigated by a timing-sample method. The target taken samples were characterized by SEC and 1H NMR in detail According to the research data based on integrating all the taken samples, the synthesized copolymer...
Relatively high contents of rubber are commonly required to trigger the brittle-to-ductile transition when using rubber components to toughen polylactide (PLA). However, the strength may drop remarkably after incorporation of large amount of rubber. The main motivation of the present work is to achieve a good toughness-strength balance in a PLA/rubber system with less amount of rubber phase (90/10...
The alternating copolymerization of one-carbon (C1) building blocks including carbon dioxide (CO2) and its sulfur analogues of carbon disulfide (CS2) and carbonyl sulfide (COS) with epoxides afford new copolymers, namely polycarbonates and polythiocarbonates, with tailored chain structures and properties. This review mainly focuses on the recent advances in C1-involved copolymerization via heterogeneous...
Boric acid (1, B(OH)3) was investigated as metal-free biocatalyst for its activity towards the bulk ring-opening polymerization (ROP) of ε-caprolactone (CL) initiated by benzyl alcohol (BnOH). Moreover, other boric acid derivates such as phenylboronic acid (2), 2-thienylboronic acid (3), 2-furanylboronic acid (4) and 5-pyrimidinylboronic acid (5) were also used as acidic catalysts to synthesize poly(ε-caprolactone)...
We report here the terpolymerization of butadiene (BD), isoprene (IP), and styrene (St) by a half-sandwich scandium catalyst bearing an unsubstituted cyclopentadienyl ligand, (C5H5)Sc(CH2C6H4NMe2-o)2/[Ph3C][B(C6F5)4], which afforded for the first time the BD–IP–St terpolymers containing high cis-1,4-BD and high cis-1,4-IP units and atactic polystyrene blocks. The copolymerization of BD and IP by this...
Crystallization behavior and solid-state microstructure of poly(hexamethylene succinate) (PHS) and its phosphorus-containing copolyesters with bulky pendent group (DDP) have been investigated. The molecular weight, chemical structure and composition of the copolyesters were characterized and confirmed by GPC, 1H and 31P NMR. WAXD results suggest that the bulky DDP comonomer units in the copolyesters...
A series of biodegradable radiopaque iodinated poly(ester-urethane)s (IPEUs) were synthesized by chain-extension of dihydroxylated poly(butylene succinate) (PBS–OH) and isophorone diisocyanate (IPDI) with iodinated bisphenol-A (IBPA). The effects of IBPA on the crystallization and melting behaviour of IPEUs were investigated by wide-angle X-ray diffraction (WAXD), polarized optical microscope (POM),...
A series of multicoumarin-functionalized dendrigraft polybutadienes with linear-comb or star-comb topology were synthesized from generation 0 to 3 (LGn and SGn respectively, n = 0–3) to investigate the dendritic effects on photophysical and fluorescence properties. From the results of SEC-TALLS, SEC and ubbelohde viscometer, the polymer architecture converted from one- or two-dimensional structure...
Three novel donor-acceptor polymers have been synthesized with Suzuki cross-coupling between thiophenyl-methylene-9H-fluorene donating unit with thiazolo[5,4-d]thiazole (PFTTTz), benzothiadiazole (PFTODTBT) or [1,2,3]triazolo[4,5-g]quinoxaline (PFTDTBTzQ) accepting unit. The polymer PFTTTz-THF prepared from tetrahydrofuran (THF) presented higher molecular weight and narrower polydiversity than that...
Water-based adhesives which have strong adhesion and can simplify the adhesion process, endow the adhesives with desired functions are important for various applications. In this work, water-based highly adhesive films with drug delivery ability are fabricated by layer-by-layer (LbL) assembly of chemically cross-linked poly(allylamine hydrochloride)-dextran (PAH-D) microgels and hyaluronic acid (HA)...
In-chain multi-functionalized polystyrene possessing definite geminal dimethylamino groups along the polymer backbone, poly(styrene-co-1,1-bis(4-dimethylaminophenyl)ethylene) (poly(styrene-co-BDADPE)), has been designed and synthesized via living anionic copolymerization of styrene with 1,1-bis(4-dimethylanimophenyl)ethylene in benzene at 50 °C, using sec-butyllithium as initiator. The amine functionality...
Time-resolved synchrotron small angle X-ray scattering (SAXS) was used to investigate the early stages of crystallization in melt crystallized polyethylene. Classic Gibbs nucleation or density fluctuation theory can be used to describe the primary nucleation mechanism. At 110 °C, no signal of crystallization can be detected by SAXS for 30 min. When it is lower than 110 °C, the low q scattering intensity...
A series of high trans-1,4-low-cis-1,4-high trans-1,4-stereotriblock polybutadienes (HTPB-b-LCPB-b-HTPBs) were synthesized through a sequential anionic polymerization of butadiene (Bd) initiated by barium salt of di(ethylene glycol) ethylether/triisobutylaluminium/dilithium (BaDEGEE/TIBA/DLi). The polymers consisted of elastic low-cis-1,4-polybutadiene (LCPB) chemically bonded with crystallizable...
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