Study on Crystallization and Foaming Properties of Hyperbranched Polyamide⁃reinforced Thermoplastic Polyurethane

doi:10.19491/j.issn.1001-9278.2021.11.001

Abstract

Abstract:

Hyperbranched polyamide （HyPer） was introduced into thermoplastic polyurethane （TPU）， and the effect of HyPer on the intermolecular hydrogen bond of TPU was investigated by Fourier?transform infrared spectroscopy. The effect of HyPer on the crystallization and rheological properties of TPU were evaluated using rotational rheometer and differential scanning calorimeter. The results indicated that HyPer could form intermolecular hydrogen bonds with carbamates in TPU， resulting in a significantly improvement in the degree of hydrogen bonding of carbonyl peak in TPU. In addition， the addition of HyPer generated a significant plasticizing effect on TPU， reducing its intrinsic viscosity， increa?sing its intermolecular mobility， and improving its crystallization rate and crystallinity. The batch?foaming experimental results demonstrated that the addition of 0.25 wt % HyPer reduced the melt viscoelasticity of TPU. This is beneficial to the cell growth and leads to an increase in foaming ratio by 30 %. The increase of hyper content enhanced the crystallinity of TPU. The existence of microcrystalline not only promoted the cell nucleation but also inhibited the cell growth. This facilitates the increase of cell density and the decrease of cell size.

Key words: thermoplastic polyurethane, hyperbranched polyamide, intermolecular hydrogen bond, crystallization, foaming

CLC Number:

TQ 323.6

DONG Bingting, ZANG Meng, YIN Kai, XIN Chunling, HE Yadong. Study on Crystallization and Foaming Properties of Hyperbranched Polyamide⁃reinforced Thermoplastic Polyurethane[J]. China Plastics, 2021, 35(11): 1-6.

Figures/Tables 10

References 13

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样品	类别	自由羰基	氢键化羰基	氢键化指数/%
纯 TPU	位置	1 732	1 706	67.1
纯 TPU	面积	32.9	67.1	67.1
TPU/1 % HyPer	位置	1 731	1 705	71.5
TPU/1 % HyPer	面积	28.5	71.5	71.5

样品	类别	自由羰基	氢键化羰基	氢键化指数/%
纯 TPU	位置	1 732	1 706	67.1
纯 TPU	面积	32.9	67.1	67.1
TPU/1 % HyPer	位置	1 731	1 705	71.5
TPU/1 % HyPer	面积	28.5	71.5	71.5

样品	T_c/℃	结晶半峰宽（WHH）/℃	熔点（T_m）/℃	熔融温区/℃	结晶热焓（H_c）/J·g^-1	熔融热焓（H_m）/J·g^-1
TPU	67.4	15.4	158.1	72.6	3.247	4.77
TPU/0.25 %HyPer	70.1	15.3	156.6	106.4	5.236	5.44
TPU/0.5 %HyPer	71.1	15.2	155.5	106.8	5.467	5.70
TPU/1 %HyPer	72.8	14.4	153.0	108.2	6.752	6.23

样品	T_c/℃	结晶半峰宽（WHH）/℃	熔点（T_m）/℃	熔融温区/℃	结晶热焓（H_c）/J·g^-1	熔融热焓（H_m）/J·g^-1
TPU	67.4	15.4	158.1	72.6	3.247	4.77
TPU/0.25 %HyPer	70.1	15.3	156.6	106.4	5.236	5.44
TPU/0.5 %HyPer	71.1	15.2	155.5	106.8	5.467	5.70
TPU/1 %HyPer	72.8	14.4	153.0	108.2	6.752	6.23

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