The phase transition from the kinetically favored tetragonal form II into thermodynamically stable hexagonal I is general phenomenon and core issue in application of polybutene-1-based materials. It known that variation molecular structure by copolymerizing counits imposition external stretching both greatly affect transition. In this work, a series butene-1/4-methyl-1-pentene (4M1P) random copolymers were synthesized with dimethylpyridylamidohafnium/organoboron catalyst, where 4M1P...

Abstract In this article, polyamide 6 (PA6), maleic anhydride grafted ethylene‐propylene‐diene monomer (EPDM‐ g ‐MA), high‐density polyethylene (HDPE) were simultaneously added into an internal mixer to melt‐mixing for different periods. The relationship between morphology and rheological behaviors, crystallization, mechanical properties of PA6/EPDM‐ ‐MA/HDPE blends studied. phase observation revealed that (70/15/15 wt %) blend is constituted from PA6 matrix in which dispersed core‐shell...

Abstract The formation of core‐shell morphology within the dispersed phase was studied for composite droplet polymer‐blend systems comprising a polyamide‐6 matrix, ethylene‐propylene‐diene terpolymer (EPDM) shell and high density polyethylene (HDPE) core. In this article, effect EPDM with different molecular weights on properties blends were studied. To improve compatibility ternary blends, modified by grafting maleic anhydride (EPDM‐ g ‐MAH). It found that EPDM‐ ‐MAH as HDPE core separated...

Glycidyl methacrylate (GMA) and styrene (St) were used as the graft monomer co-graft monomer, respectively, grafted onto poly(ethylene-octene) (POE) linear low-density polyethylene (LLDPE) to prepare a series of GMA-functionalized (POE/LLDPE)-g-(GMA-co-St) copolymers. The copolymers then blended with poly(butylene terephthalate) (PBT) produce PBT/(POE/LLDPE)-g-(GMA-co-St) blends. effects grafting factors copolymer content on mechanical properties, thermal rheology, morphology, deformation...

This work presents an in-depth study of fiber-induced nucleation and crystalline morphology in polybutene-1/single-fiber composites. The ability various fibers, including carbon, glass, polypropylene (PP), poly(l-lactide) (PLLA), stereocomplex (SC)-poly(lactide), is investigated via polarized optical microscopy. A polybutene-1 (PB-1) fiber made the trigonal Form I polymorph also adopted all-PB-1 composite. Two different types morphologies PB-1 II developed on surface fibers during isothermal...

ABSTRACT The stretching‐induced phase transition from tetragonal Form II to hexagonal I and the evolution of corresponding crystallite orientation were studied for butene‐1/ethylene random copolymer with 1.5 mol % ethylene by using a combination tensile test in situ wide‐angle X‐ray diffraction. Three pathways distinguished II‐I transition, including accomplishing within off‐axis oriented crystallites (Orientation Pathway 1), simultaneous formation highly 2), occurring already formed 3)....

A core–shell polybutadiene-graft-polystyrene (PB-g-PS) copolymer with a ratio of 70/30 (wt/wt) was synthesized by redox-initiated emulsion graft polymerization. Compatible polymers polyphenylene ether (PPE) and polystyrene (PS) blend were toughened the addition high-impact (HIPS) PB-g-PS copolymer, content PB rubber in whole matrix kept at 17.4 wt %. The influence composition synergistic toughening effect different-sized particles on mechanical properties, morphology, deformation mechanism...

Abstract Biodegradable active packaging materials have received growing attention for extending the shelf life of foodstuffs. A Pectin/eugenol (Pe/Eu) composite film is prepared by casting from pectin and eugenol. The morphology wettability are characterized. antioxidant activity determined with DPPH method. Special given to release kinetics Eu Pe/Eu its application in pork preservation. results display that increased surface roughness, hydrophobicity, film. In addition, mechanism controlled...

Quiescent phase transition from the tetragonal form II into hexagonal I was utilized to prepare II/I mixture systems in butene-1/ethylene random copolymer with 1.5 mol% ethylene units, where aging duration varied tune fraction of initial crystallites. The mechanical test and in-situ wide-angle X-ray diffraction were combined quantitatively explore stretching-induced systems. Interestingly, triggering further forms always corresponds its yielding. This may be associated formation new tie...

In the present work, crystallization of a soluble nucleator N, N', N″-tricyclohexyl-1,3,5-benzenetricarboxylamide (TMC-328) in poly(l-lactic acid) (PLLA) matrix has been studied at different temperatures. Based on change solubility with temperature, levels supersaturation TMC-328 PLLA can be obtained. This presents fibrous structure produced via self-assembling and develops into an interconnected network when temperature is lowered. The crystal nuclei density quantified optical microscopy,...

The existence of epitaxy in polybutene-1 form II-on-form I cross-nucleation was investigated by nanofocused synchrotron X-ray diffraction. To this aim, hedrites, which show a lamellar stacking with uniform crystal lattice orientation, were adopted as the substrate. II crystals develop spherulitic transcrystalline layer on lateral surface substrate, due to cross-nucleation. Through mapping both intensity and azimuthal orientation characteristic planes two polymorphs, clearly defined...

After investigating kinetics of the UV photodegradation PET film samples having a thickness 4.4 µm, we found that process takes place in two steps: very rapid initial step followed by normal step. This phenomenon is explained using concept “weak links.” We have obtained rate constants degradation “normal links” kN = 9.0 × 10−7 h−1 and kW 0.46 number scissions weak links per molecules PW 0.22. For treated stabilizer, 2.0 h−1, 0.11 0.27. The ratios untreated to are 4.2 for 4.5 kN. These...

In view of bond rotation flexibility and the additivity stiff energy, a new equation containing mole fractions sequences glass transition temperatures (Tg's) periodic copolymers was proposed. Meanwhile, effect stereochemical also taken into account. Even for case all substitutions on primary (C1), second (C2), third (C3) carbon atoms adjoining to given (triad effect) be considered, no intractable parameters exist in if poly[AB], poly[AAB], poly[BBA] could acquired. This may facilitate its...

This work is aim to study the encapsulated morphology development in ternary blends of polyamide 6/high density polyethylene/maleic anhydride-grafted-ethylene propylene diene monomer (PA6/HDPE/EPDM-g-MA) and 6/maleic anhydride-grafted-high polyethylene/ethylene (PA6/HDPE-g-MA/EPDM) through thermodynamically control described by Harkins spreading theory. The phase was confirmed using scanning electron microscope (SEM) selective solvent extraction revealed that PA6/HDPE/EPDM-g-MA blend having...

Poly(L-lactide)-poly(ethylene glycol) (PLLA-PEG) diblock copolymer film was observed to exhibit ring-banded spherulite morphology when crystallized from melt. Polarized optical microscopy (POM) and atomic force (AFM) revealed that the structure is composed of alternating concave convex bands, which correspond flat-on lamellae showing layered terrace-like edge-on fibrillar texture, respectively. The composition distribution chain orientation within were further analyzed by Fourier transform...

Abstract When a minor semicrystalline phase is dispersed in an immiscible blend with another polymer the form of isolated droplets, its crystallization behavior dominated by nucleation. In particular, nucleation can occur bulk volume (homogeneous nucleation), at surface possible nucleating foreign impurities, or interface matrix polymer. Dispersed poly(butene‐1) (PB) and polycaprolactone (PCL) droplet phases are employed various matrices (isotactic polypropylene (iPP), high density...