Abstract
Isotactic polybutylene-1 (iPB) has lots of advantages and is best used as hot water pipe. However, to transform into stable crystal form I, the iPB needs as long as 7 days. In this process, the irreversible damage brings great difficulties to the use of the iPB. The method which convert it directly into crystal I has shortcomings such as being requiring complex operation and being expensive. In this study, an innovative idea was put forward, not paying attention to the crystal transformation of iPB but only focusing on reducing the time it can be applied. In this study, bamboo powder was modified by the silane coupling agent KH570 (KBP) to prepare iPB/KBP composite. The infiltration test and Fourier transform infrared (FTIR) analysis showed that the hydrophilicity of KBP is greatly reduced, which can greatly improve the compatibility of the iPB and KBP. The tensile strength, tensile modulus, flexural strength, and flexural modulus of the composites storage for 3 days is equal to the pure iPB with storage 7 days with the KBP additions of 3%, 3%, 7%, and 5%, respectively. The heat deformation temperature (HDT) of the composite with 3% KBP after 1-day storage reached the value of pure iPB storage for 7 days. This provides more space and possibilities for the industrialization of the iPB. The crystallization behavior of iPB/KBP composites proves that the addition of KBP accelerates the crystallization rate of iPB, but the crystallinity of the iPB/KBP composites is not changed. The SEM photograph of iPB/KBP composites showed that when the KBP addition was low the compatibility between KBP and iPB was good. When the KBP addition was increased the agglomeration of KBP in the iPB was very obvious, which leads to the poor mechanical properties of the composite.
Highlights
Isotactic polybutylene-1 is a kind of polybutylene-1 polymer with molecular chain regularity greater than 90% [1]. iPB has lots of advantages such as excellent mechanical properties, creep resistance, and stress-cracking resistance [2,3]
The results show that the PGS accelerates the transformation from crystal form II to I for PB-1 more efficiently than halloysite nanotube (HNT)
The decrease of wettability by water may be attributed to the fact that the introduction of KH570 can lead to the surface of bamboo powder (BP) changing from hydrophilic to hydrophobic because of the presence of organic functional groups of KH570
Summary
Isotactic polybutylene-1 (iPB) is a kind of polybutylene-1 polymer with molecular chain regularity greater than 90% [1]. iPB has lots of advantages such as excellent mechanical properties, creep resistance, and stress-cracking resistance [2,3]. The iPB is a polymorphism polymer, which first forms thermodynamically unstable crystal form II (Tetragonal) after molding, which has disadvantages of low melting point and poor mechanical properties and gradually transforms into stable crystal form I (Hexagonal) after 7 days at room temperature [5,6,7] In this process, the irreversible damage of the iPB caused by external forces will bring great difficulties to the transportation and use of the iPB. The form I can be produced directly by quenching mixed iPB/iPP melt down to temperatures below the upper critical solution temperature (The polymer blend system is completely compatible beyond this temperature) and the melting point, and the quenching temperature or quenching time has a great influence on the crystalline transformation of the iPB. The crystallization behavior and the compatibility of the iPB/KBP composites were discussed
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